CA2723856C - Compositions and methods for the removal of oil-based filtercakes - Google Patents

Compositions and methods for the removal of oil-based filtercakes Download PDF

Info

Publication number
CA2723856C
CA2723856C CA2723856A CA2723856A CA2723856C CA 2723856 C CA2723856 C CA 2723856C CA 2723856 A CA2723856 A CA 2723856A CA 2723856 A CA2723856 A CA 2723856A CA 2723856 C CA2723856 C CA 2723856C
Authority
CA
Canada
Prior art keywords
acid
oil
precursor
composition
wellbore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA2723856A
Other languages
French (fr)
Other versions
CA2723856A1 (en
Inventor
Eric Davidson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Halliburton Energy Services Inc
Original Assignee
Halliburton Energy Services Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Halliburton Energy Services Inc filed Critical Halliburton Energy Services Inc
Publication of CA2723856A1 publication Critical patent/CA2723856A1/en
Application granted granted Critical
Publication of CA2723856C publication Critical patent/CA2723856C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/72—Eroding chemicals, e.g. acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/72—Eroding chemicals, e.g. acids
    • C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes

Abstract

A method of servicing a wellbore comprising providing a composition comprising a mutual solvent precursor, an acid precursor, and an aqueous fluid, and contacting the composition with oil wet solids in the wellbore. A method of servicing a wellbore comprising introducing an oil-based fluid into a wellbore, wherein the oil-based fluid forms oil wet solids in the wellbore, contacting the oil wet solids in the wellbore with a composition comprising a mutual solvent precursor; an acid precursor and an aqueous fluid, and allowing the oil wet solids to become water wet. A
method of servicing a well bore comprising contacting a composition comprising a formate ester with oil wet solids in the well bore under conditions wherein the formate ester hydrolyzes to release formic acid, wherein the formic acid catalyzes the hydrolysis of additional formate ester, and wherein all or a portion of the formate ester converts at least a portion of the oil- wet solids to water- wet solids.

Description

COMPOSITIONS AND METHODS FOR THE REMOVAL OF OIL-BASED
FILTERCAKES
Field of the Invention [0001] This disclosure relates to servicing a wellbore. More specifically, it relates to servicing a wellbore with compositions comprising (i) an acid and/or an acid precursor and (ii) a mutual solvent precursor.
Background of the Invention [0002] Natural resources such as gas, oil, and water residing in a subterranean formation can be recovered by drilling wells into the formation. Well drilling involves drilling a wellbore down to the formation while circulating a drilling fluid or mud through the wellbore. Various types of drilling fluids, also known as drill-in fluids when used in the productive interval, have been used in well drilling, such as water-based fluids, mineral oil-based fluids, and synthetic oil-based fluids. Such drilling fluids form a thin, slick filter cake on the formation face that provides for successful drilling of the wellbore and that helps prevent loss of fluid to the subterranean formation.
[0003] In well drilling, several stages may be used to produce oil found in subterranean formations. The first stage, which is known as the primary production stage, allows the oil to flow into a production well (or wells) under natural forces. At first, the natural forces may be sufficient to drive the oil to the surface where it is recovered. However, at some point, pumps may be required to , displace the oil from the wellbore to the surface. A secondary recovery operation thus is typically performed to recover additional amounts of the oil from the reservoir. A common secondary recovery operation known as secondary flooding involves injecting a fluid such as water into a so-called injection well (or wells) to drive oil in the formation to the production well (or wells). Tertiary recovery operations such as tertiary flooding may also be used to drive the remaining oil from the formation to the production well.
[0004] Typically, the presence of the filter cake on the face of the subterranean formation can adversely affect the flow of fluid though the injection wells and the production wells. In the case of the injection wells, particularly in deepwater environments, the injected fluid is not flowed back to remove the filter cake left by the drill-in fluid. The pump pressures (e.g., fracturing pressures) required to inject past the filter cake are higher than desirable for achieving good sweep efficiency of the oil. Thus, it would be desirable to develop improved compositions and methods for removing a filter cake from a subterranean formation.
SUMMARY
[0005] Disclosed herein is a method of servicing a wellbore comprising providing a composition comprising a mutual solvent precursor, an acid precursor, and an aqueous fluid, and contacting the composition with oil wet solids in the wellbore.

, , [0006] Also disclosed herein is a method of servicing a wellbore comprising introducing an oil-based fluid into a wellbore, wherein the oil-based fluid forms oil wet solids in the wellbore, contacting the oil wet solids in the wellbore with a composition comprising a mutual solvent precursor; an acid precursor and an aqueous fluid, and allowing the oil wet solids to become water wet.
[0007] Further disclosed herein is a method of servicing a well bore comprising contacting a composition comprising a formate ester with oil wet solids in the well bore under conditions wherein the formate ester hydrolyzes to release formic acid, wherein the formic acid catalyzes the hydrolysis of additional formate ester, and wherein all or a portion of the formate ester converts at least a portion of the oil-wet solids to water-wet solids.
[0008] Further disclosed herein is a method of servicing a wellbore comprising providing a composition comprising a mutual solvent precursor, an acid, and an aqueous fluid, and contacting the composition with oil wet solids in the wellbore.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description, wherein like reference numerals represent like parts.
[0010] Figure 1 is an illustration of a high temperature high pressure cell used in Example 1.

DETAILED DESCRIPTION
[0011] The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter that form the subject of the claims of the invention. It should be appreciated by those skilled in the art that the conception and the specific embodiments disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present invention.
[0012] Disclosed herein are wellbore servicing compositions comprising a mutual solvent precursor, an acid precursor, and an aqueous fluid. Such compositions may be referred to herein as compositions for oil-based filtercake removal (COFR). In some embodiments, the COFR may be used for the removal of a water-based filtercake containing oil- wet components. In other embodiments, the COFR may be used for the removal of a water based fitlercake that has been contaminated with oil wet components (e.g., crude oil) Hereinafter, the disclosure will refer to the use of compositions for the removal of an oil-based filtercake although the removal of other compositions of the type disclosed herein are also contemplated. The COFRs may be placed downhole and used to service a wellbore, for example providing for a time-delayed removal of an oil-based filtercake from the wellbore. Each of the components of the COFR as well as methods of using same will be described in more detail herein.
[0013] In an embodiment, the COFR comprises a mutual solvent precursor.
Herein a mutual solvent is defined as a material that is soluble in oil, water, and acid-based treatment fluids. Given that the mutual solvent is miscible with more than one class of liquids, such materials may also be referred to as coupling agents because such materials can cause two ordinarily immiscible liquids to combine with each other. Herein a mutual solvent precursor is defined as a mutual solvent or coupling agent that has been modified to provide for delayed release of the mutual solvent. Such mutual solvent precursors may also be referred to as time-delayed and/or time-released mutual solvents. Examples of modifications to mutual solvents to form mutual solvent precursors include without limitation the addition of an operable functionality component or substituent, physical encapsulation or packaging, or combinations thereof The operable functionality component or substituent may be acted upon in any fashion (e.g., chemically, physically, thermally, etc.) and under any conditions compatible with the components of the process in order to release the mutual solvent at a desired time and/or under desired conditions such as in situ wellbore conditions. In an embodiment, the mutual solvent precursor may comprise at least one modified mutual solvent (e.g., having an operable functionality, encapsulation, packaging, etc.) such that when acted upon and/or in response to pre-defined conditions (e.g., in situ wellbore conditions such as temperature, pressure, chemical environment), a mutual solvent is released.
[0014] Mutual solvents suitable for modification to form mutual solvent precursors include for example and without limitation glycol ethers such as ethylene glycol monobutylether (EGMBE) or propylene glycol monobutylether;
diethyle glycol monobutylether; triethylene glycol monobutylether;
hydrocarbon;
mineral oils, paraffins; methanol; isopropyl alcohol; alcohol ethers;
aldehydes;
ketones; aromatic solvents; derivatives thereof; and combinations thereof.
Examples of commercially available mutual solvents include MUSOL
(trademark) mutual solvent sold by Halliburton Energy Services, SOL-15 (trademark) sold by Fracmaster Ltd., and SUPER-SQL (trademark) sold by Osca.
[0015] In an embodiment, the mutual solvent precursor comprises an esterified mutual solvent. In such embodiments, the ester linkage may be hydrolyzed to release the mutual solvent. For example, the ester linkage may be hydrolyzed by contact with water present in the aqueous fluid of the COFR and/or water present in situ in the wellbore. In an embodiment, the mutual solvent precursor comprises a glycol ether ester, and upon hydrolysis of the ester linkage, a glycol ether mutual solvent is released. Examples of glycol ether esters suitable for use in this disclosure include without limitation butyl glycol acetate, butyl diglycol acetate, butyl triglycol acetate, butyl glycol dimethoxyacetal, isooctanol acetate, isopropanol acetate, 1-methoxy-2-propanol acetate and the corresponding acetals, propionates and the like. Also, the mutual solvent can be tetraethylene glycol monobutyl ether.
[0016] The concentration of the mutual solvent precursor in the COFR may range from about 1% to about 50% by volume, alternatively from about 1% to about 30%, alternatively from about 5% to about 15%, alternatively from about 10% to about 20%. Other factors that may be considered in deciding how much of the mutual solvent precursor to use include, but are not limited to; the temperature of the formation; the pressure of the formation; the particular mutual solvent precursor used; and the expected contact time of the generated mutual solvent with the filtercake. Other suitable mutual solvent precursors are disclosed in U.S.
Patent Nos. 6,877,563 and 7,021,383.
[0017] In an embodiment, the COFR comprises an acid precursor. Herein an acid precursor is defined as a material or combination of materials that provides for delayed release of one or more acidic species. Such acid precursors may also be referred to as time-delayed and/or time-released acids. In embodiments, acid precursors comprise a material or combination of materials that may react to generate and/or liberate an acid after a period of time has elapsed. The liberation of the acidic species from the acid precursor may be accomplished through any means known to one of ordinary skill in the art with the benefits of this disclosure and compatible with the user-desired applications. In embodiments, acid precursors may be formed by modifying acids via the addition of an operable functionality component or substituent, physical encapsulation or packaging, or combinations thereof The operable functionality component or substituent may be acted upon in any fashion (e.g., chemically, physically, thermally, etc.) and under any conditions compatible with the components of the process in order to release the acid at a desired time and/or under desired conditions such as in situ wellbore conditions. In an embodiment, the acid precursor may comprise at least one modified acid (e.g., having an operable functionality, encapsulation, packaging, etc.) such that when acted upon and/or in response to pre-defined conditions (e.g., in situ wellbore conditions such as temperature, pressure, chemical environment), an acid is released. In an embodiment, the acid precursor may comprise an acidic species that is released after exposure to an elevated temperature such as an elevated wellbore temperature. In an embodiment, the acid precursor comprises a material which reacts with one or more components of the COFR (e.g., reacts with an aqueous fluid present in the COFR) to liberate at least one acidic species.
[0018] In an embodiment, the acid precursor compound comprises a reactive ester. Hereinafter, for simplicity, the remainder of the disclosure will focus on the use of a reactive ester as the acid precursor with the understanding that other acid precursors may be used in various embodiments. The reactive ester may be converted to an acidic species by hydrolysis of the ester linkage, for example by contact with water present in the aqueous fluid of the COFR and/or water present in situ in the wellbore. Suitable acid precursors for use in the present disclosure include lactic acid derivatives such as methyl lactate, ethyl lactate, propyl lactate, butyl lactate; esters and/or formates that are water soluble or partially soluble such as ethylene glycol monoformate, ethylene glycol diformate, diethylene glycol diformate, glyceryl monoformate, glyceryl diformate, glyceryl triformate, triethylene glycol diformate; formate esters of pentaerythritol; esters or polyesters of glycerol including, but not limited to, tripropionin (a triester of propionic acid and glycerol), trilactin, esters of acetic acid and glycerol such as monoacetin, diacetin, and triacetin; esters of glycolic acid such as ethyl or methyl or propyl or butyl glycolate or esters of glycolic acid and polyols such as glycerol and glycols, aliphatic polyesters; poly(lactides); poly(glycolides); poly(c-caprolactones);

poly(hydroxybutyrates); poly(anhydrides); aliphatic polycarbonates; poly(amino acids); and polyphosphazenes; or copolymers thereof: poly(ortho esters);
orthoesters (which may also be known as "poly ortho ethers" or "ortho ethers");
esters of oxalic acid; aliphatic polyesters; poly(lactides); poly(glycolides);
poly(E-caprolactones); poly(hydroxybutyrates); poly (anhydrides); poly(amino acids);
esters of propionic acid; esters of butyric acid; esters of monochloroacetic acid;
esters of dichloroacetic acid; esters of trichloroacetic acid; derivatives thereof; or combinations thereof Other suitable acid precursors include halide esters and esters of acids such as esters of nitric acid, sulphuric acid, sulphonic acid, sulphinic acid, phosphoric acid, phosphorous acid, phosphonic acid, phosphinic acid, sulphamic acid and the like.
[0019] In an embodiment, the acid precursor comprises diethylene glycol diformate, diethylene glycol monoformate, monoethylene monoformate, monoethylene diformate, ethyl lactate, methyl lactate, tri-n-propyl orthoformate, tri-n-butyl orthoformate, or combinations thereof [0020] The choice and physical form of a suitable acid precursor may depend on a variety of factors including but not limited to the time at which liberation of the acidic species is desired relative to the placement of the COFR in the wellbore; the environmental conditions presented; the conditions within the wellbore; the temperature of the wellbore section in which the COFR is being placed; the composition of the formation water, etc. Other considerations may be evident to those skilled in the art with the benefits of this disclosure.
[0021] The acid precursor may be present in an amount ranging from about 5%
to about 50% based on total volume of the composition, alternatively from about 5% to about 30%, alternatively from about 10% to about 25%, alternatively from about 12% to about 18%. Other factors that may be considered in deciding how much of the acid precursor to use include, but are not limited to, the composition of the formation, the temperature of the formation, the pressure of the formation, the diameter of the hole, the particular fines and damage present in the formation (e.g., scale, skin, calcium carbonate, silicates, and the like), the particular acid precursor used, the expected contact time of the generated acid with the formation, and the like. Suitable acid precursors have been disclosed in U.S.
Patent Nos. 6,877,563, 7,021,383 and 7,455,112.
[0022] In an embodiment, the COFR may comprise a mutual solvent (e.g., EGMBE), a mutual solvent precursor (e.g., EGMBE acetate), an acid (e.g., HC1), an acid precursor (e.g., formate ester), or combinations thereof. The mutual solvent may be of a type formed from one or more of the mutual solvent precursors described herein, and the acid may be of a type formed from one or more of the acid precursors described herein. The components of the COFR may be chosen by one of ordinary skill in the art, with the benefits of this disclosure, to produce a COFR that results in the delayed removal of an oil based filtercake or a water-wet filtercake having oil-wet components. The extent of the delay may be adjusted by one of ordinary skill in the art using the benefits of this disclosure.
[0023] Aqueous fluids that may be used in the COFR include any aqueous fluid suitable for use in subterranean applications. For example, the COFR may comprise water or a brine. Suitable brines include, but are not limited to:
NaC1, NaBr, CaC12, CaBr2, ZnBr2, sodium formate, potassium formate, cesium formate, combinations thereof and derivatives thereof. The specific brine used may be dictated by the desired density of the resulting surfactant wash treatment fluid.
Denser brines may be useful in some instances. The density of the aqueous fluid, and likewise the density of the COFR, may be selected and adjusted as recognized by one skilled in the art with the benefit of this disclosure. In an embodiment, the aqueous fluid comprises a brine, alternatively NaBr. The brine may be present in an amount of from about 40 wt.% to about 90 wt.% based on the total weight of the composition. Alternatively, the aqueous fluid may comprise the balance of the COFR after considering the amount of the other components used.
[0024] In an embodiment, the COFR further comprises one or more rate adjustment materials (RAMs), which function to adjust the hydrolysis rate of the mutual solvent precursor and/or acid precursor. The RAM may be present in an amount of from about 0,1% to saturation. In some embodiments, the COFR may contain more than one acid precursor that functions as a RAM for one or more additional precursors (e.g., acid and/or mutual solvent) present in the COFR.
For example, the COFR may contain more than one acid precursor wherein a first acid precursor may function to rapidly generate an acidic species that influences the half life of the hydrolysis reaction for one or more additional precursors (e.g., a second acid precursor and/or mutual solvent precursor). As such the first acidic precursor may function primarily as a RAM which controls the rate of the development of a second acidic species that is to be used in removal of the filtercake. The term "half-life" as used herein refers to the time it takes for half of the original amount of the precursor (either mutual solvent or acid) to react.
For example, diethyleneglycol diformate may be employed as a RAM in a wellbore servicing composition comprising a mutual solvent precursor in the form of an ester of a hydroxyl compound. Thus, the diethyleneglycol diformate, or other RAMs, could be used to shorten the completion time of the well.
Diethyleneglycol diformate forms formic acid as a result of hydrolysis, and is commercially available from Halliburton Energy Services, Inc., under "N FLOW 325"
(trademark). Examples of other esters or polyesters that may be suitable for adjusting the half-life of the acid and/or mutual solvent precursor in the COFR
include, but are not limited to, diethyleneglycol monoformate, monoethyleneglycol diformate, monoethyleneglycol monoformate, polylactic acid, lactate esters, and derivatives and combinations thereof. The combinations of these precursors (e.g., a RAM acid precursor with one or more additional precursor materials) may be selected and designed by one of ordinary skill in the art with the benefits of this disclosure to produce a desired effect or profile (e.g., acid and/or mutual solvent release profile) at or over a period of time, for example after introduction of the COFR to a wellbore, after completion of certain wellbore servicing or processing such as drilling, etc. Such release profiles may include a steady increase or decrease in release rate (i.e., constant slope), exponential increase or decrease in release rate, step-wise increases or decreases in release rates, maximums and/or minimums in release rate (e.g., bell-shaped profiles), and combinations thereof.
[0025] In another embodiment, the RAM comprises one or more pH lowering materials (e.g., acids or acidic materials). For example, the RAM may comprise small amounts of one or more reactive materials such as mineral acids, organic acids, acidic anhydrides, p-toluenesulfonic acid, etc. to lower the pH and accelerate the hydrolysis of the acid-precursors. In other embodiments, the RAM
comprises one or more pH raising materials (e.g., bases or basic materials).
For example, in some instances, such as with ortho esters, the hydrolysis rate may be slowed by the addition of a small amount of a strong base such as NaOH, Na2CO3, NaHCO3 and Mg(OH)2 or organic bases such as ethanolamine or other aliphatic or aromatic amine type compounds. RAMs are also described in U.S.
Patent Nos. 8,220,548 and 7,455,112.
[0026] In some embodiments, the components of the COFR may comprise water and/or brine insoluble compounds. Alternatively, the COFR comprises compounds with a low solubility in water and/or brine. In such embodiments, the compounds may be introduced to the COFR as oil-in-water emulsions, water on oil emulsions or additives may be included in the compositions (e.g.
demulsifiers) to facilitate the preparation of the COFR.
[0027] In an embodiment, the COFR comprises a mutual solvent precursor and acid precursor wherein the mutual solvent precursor and acid precursor are provided by a single compound. For example, the COFR may comprise a formate ester. Hydrolysis of a formate ester is known to be rapid in comparison to the hydrolysis of acetates or propionates under similar hydrolysis conditions.
Consequently, the formate when hydrolyzed produces formic acid which in turn lowers the pH of the COFR and increases the hydrolysis of additional formate ester. The formate ester may comprise ethylene glycol monobutyl ether formate, diethyleneglycol monobutyl ether formate or combination thereof.
[0028] In an embodiment, the COFR comprises EGMBE formate which functions as both a mutual solvent precursor and an acid precursor. In such embodiments, the dual functionality of EGMBE formate may preclude the use of additional acid, acid precursor, or RAMs in the COFR. In some embodiments, the COFR comprising EGMBE formate may comprise components to delay the action of the COFR on the filtercake such as for example, pH raising materials. The composition of a COFR comprising a formate (e.g. EGMBE formate) may be adjusted by one of ordinary skill in the art to meet the needs of the process with the benefits of this disclosure.
[0031] The components of the COFR (e.g. mutual solvent precursor, acid precursor, aqueous fluid, optional rate adjustment material) may be combined using any mixing device compatible with the composition. In an embodiment, the components of the COFR are combined at the well site; alternatively, the components of the COFR are combined off-site and are transported to and used at the well site. The contacting of the components of the COFR may initiate hydrolysis of the acid precursor and/or mutual solvent precursor by the aqueous fluid, for example via hydrolysis and dissociation of ester groups present in the precursors. Release of one or more acidic species from the acid precursor will decrease the pH of the COFR and accelerate hydrolysis of (i) the mutual solvent precursor to release the mutual solvent, (ii) any additional acid precursors present, or (iii) combinations of (i) and (ii). The mutual solvent may then contact the oil based filtercake and convert the filtercake from oil wet to water wet thus increasing its susceptibility to degradation by the acidic species. The COFR
may be designed so as to produce the acidic species and mutual solvent slowly, in-situ within the wellbore following placement therein. Thus, the pH of the COFR at the time of placement (e.g., pumping) down hole may not be as low (i.e., may be less acidic) than would be the case if an aqueous solution of the acidic species was pumped into the well bore. As such, the filtercake removal/cleaning action of the COFR likewise may be delayed, for example delayed from about 2 hours to about 96 hours, alternatively equal to or greater than about 2 to about 3 hours, alternatively equal to or greater than about 24 hours, alternatively from equal to or greater than about 2 to about 5 days. As noted previously, the extent of the delay may be adjusted by one of ordinary skill in the art with the benefit of this disclosure to meet the needs of the process by adjusting the nature of the precursors used (e.g., compound type, amounts, delaying mechanism employed, etc.) or through the addition of RAMs as described earlier.
[0030] In an embodiment, a method of servicing a wellbore comprises drilling a wellbore in a subterranean formation and introducing to the formation an oil-based servicing and/or drilling fluid or an aqueous based servicing and/or drilling fluid that comprises at least one oleaginous component, wherein oil coated/wet solids (e.g., filtercake, drill cuttings, etc.) are formed as a result. It is to be understood that "subterranean formation" encompasses both areas below exposed earth and areas below earth covered by water such as ocean or fresh water.
Examples of oil-based fluids include oil-based drilling or servicing fluids, invert emulsions, servicing fluids comprising substantially no aqueous component, and the like. Examples of the oleaginous component used in an oil-based fluid may include without limitation olefins, kerosene, diesel oil, fuel oil, synthetic oils, linear or branched paraffins, olefins, esters, acetals, mixtures of crude oil, and combinations and derivatives thereof [0031] In an embodiment, the introduction of an oil-based fluid (e.g., drilling fluid) may result in the deposition of oil wet solids on the sides or surfaces within the wellbore. The oil-wet solids may be components of the filter cake, a formation face, a fracture face, a perforation, or on a screen (e.g., a gravel pack screen) or another piece of equipment located in the wellbore or subterranean formation.
[0032] The method further comprises contact of the oil wet solids with a COFR
as described herein to effect removal of the oil from the oil wet solids and/or conversion of the solids from oil wet to water wet. For example, a COFR may be placed in a wellbore and contacted with a filtercake or other oil wet solids located down hole. The oil-wet solids when contacted with a COFR of the type disclosed herein may become water-wet, and then subsequently be degraded by the COFR.
For example, upon becoming water wet, acid from the COFR may contact and decompose one or more components of the water wet solids (e.g., calcium-based components such as calcium carbonate contained in the filtercake). The COFRs disclosed herein may result in the removal of oil wet solids (e.g. filtercake) in a time delayed fashion so as to allow for the efficient removal of oil wet solids while minimizing damage to the formation or to allow for other servicing operations. For example, a time delay in removing the filter cake may provide sufficient time for the COFR to become fully and evenly distributed along a desired section of the wellbore, such that upon activation, the COFR removes the filtercake about simultaneously and equally along the entire treated section of wellbore. Such even treatment prevents isolated break-through zones in the filtercake that may undesirably divert subsequent servicing fluids placed downhole. Also, time delays in removing the filter cake may allow for subsequent servicing steps such as removing servicing tools from the wellbore. Following treatment with a COFR, production can then take place, if desired or appropriate, as for example in a hydrocarbon-producing well.

EXAMPLES
[0033] The invention having been generally described, the following examples are given as particular embodiments of the invention and to demonstrate the practice and advantages thereof. It is understood that the examples are given by way of illustration and are not intended to limit the specification.

[0034] Compositions for the removal of an oil based filtercake were prepared having the components indicated in Table 1 and used to treat an oil based filtercake. N FLOW 325 is a delayed formic acid based breaker; BDF 443 is an acid activated surfactant as described in U.S. Patent No. 8,220,548; and MUSOL

is a mutual solvent comprising ethyleneglycol monobutyl ether all of which are commercially available from Halliburton Energy Services. Butyl glycol acetate is a mutual solvent precursor, which upon being hydrolyzed 15% produces approximately 10% ethylene glycol monobutylether (EGMBE). The brine contained sodium bromide at a density of 1.2 kg/L. A visual assessment of the clean up of the filtercake was made and the return injectivity of the filtercake was assessed for each composition in Table 1 using a high temperature high pressure (HTHP) cell 100 fitted with a ceramic disc 110 as shown in Figure 1.
[0035] Referring to Figure 1, the ceramic disc 110 was pre-soaked in fresh water and then placed in the HTHP cell 100. The HTHP cell 100 was then filled with 300 ml water, sealed, and pressurized to 100 psi. The time rate of discharge for 200 ml was measured as a control. After an appropriate duration of time, at relevant temperature and applied differential pressure, a filtercake 120 was formed on the ceramic disc (110) using the drilling fluid under test and the fluid loss was measured. Next, the remaining supernatant liquor (i.e., supernatant drilling fluid) poured from the HTHP cell 100. The HTHP cell 100 was then filled with 350 ml of a composition and allowed to soak at relevant applied differential pressure for an appropriate duration of time. The compositions evaluated are presented in Table 1. Next, the remaining liquid was poured off of the HTHP
cell 100, and the filtercake 120 was visually inspected. The HTHP cell 100 was then filled with 300 ml water, sealed, and pressurized to 100 psi. The time rate of discharge for 200 ml was measured again to assess the return injectivity of the filtercake 120. The results of these assessments are also summarized in Table where the percentages (%) give the percent by total weight of each component of the composition.
Table 1 visual Composition Return Assessment of Comments Injectivity Clean Up I 0% N FLOW 325, The results were very good but the negative 10% MUSOL, 80% Good Good ' aspect was that the tvesenee of the MUSOL
Brine caused the 1111cm:eke to disintegrate very rapidly;
mach more =icily %au wjas (1415111-11g, HY% N FLOW 323, 1% N FLOW 443, Good Good ; NONE
SIM Brine I N FLOW 325, No obvious NONE
90% Brine removal 10% N FLOW 3-25, This treatment pro' ided an excellent dean up but 15% butyl glycol Excellent Excellent also a delayed action on the fthereake.
acetate, 75% brine [0036] The results demonstrate the composition comprising an acid precursor and a mutual solvent precursor, butyl glycol acetate, provided the best visual assessment of clean up of the oil-based filtercake and return injectivity.
[0037] The embodiments described herein are exemplary only, and are not intended to be limiting. Many variations and modifications of the invention disclosed herein are possible. Where numerical ranges or limitations are expressly stated, such express ranges or limitations should be understood to include iterative ranges or limitations of like magnitude falling within the expressly stated ranges or limitations (e.g., from about 1 to about 10 includes, 2, 3, 4, etc.;
greater than 0.10 includes 0.11, 0.12, 0.13, etc.). Use of the term "optionally" with respect to any element of a claim is intended to mean that the subject element is required, or alternatively, is not required. Both alternatives are intended to be within the scope of the claim. Use of broader terms such as comprises, includes, having, etc.
should be understood to provide support for narrower terms such as consisting of, consisting essentially of, comprised substantially of, etc.

Claims (26)

1. A method of servicing a wellbore comprising:
providing a composition comprising a mutual solvent precursor, an acid precursor, and an aqueous fluid; and contacting the composition with oil wet solids in the wellbore.
2. The method of claim 1 wherein the mutual solvent precursor releases one or more mutual solvents selected from the group consisting of ethylene glycol monobutylether; diethylene glycol monobutyl ether; triethylene glycol monobutyl ether; tetraethylene glycol monobutyl ether; methanol; isopropyl alcohol;
alcohol ethers; aromatic solvents; hydrocarbons; mineral oils; paraffins; butyl glycol acetate, butyl diglycol acetate, butyl triglycol acetate, butyl glycol dimethoxyacetal, isooctanol acetate, isopropanol acetate, 1-methoxy-2-propanol acetate, and derivatives and combinations thereof.
3. The method of claim 1 wherein the mutual solvent precursor comprises an esterified ether.
4. The method of claim 1 wherein the mutual solvent precursor comprises an ester of ethylene glycol monobutylether, an ester of propylene glycol monobutylether, or combinations thereof.
5. The method of claim 1 wherein the mutual solvent precursor is present in the composition in an amount of from about 1% to greater than about 50% based on total volume of the composition.
6. The method of claim 1 wherein the acid precursor comprises lactic acid derivatives; esters and/or formates that are water soluble or partially water soluble; esters or polyesters of glycerol; esters of acetic acid and glycerol;

aliphatic polyesters; poly(lactides); poly(glycolides); poly(.epsilon.-caprolactones);
poly(hydroxybutyrates); poly(anhydrides); aliphatic polycarbonates;
polyphosphazenes; poly(ortho esters); orthoesters; esters of oxalic acid;
poly(amino acids); esters of propionic acid; esters of butyric acid; halide esters;
esters of nitric acid, sulphuric acid, sulphonic acid, sulphinic acid, phosphoric acid, phosphorous acid, phosphoric acid, phosphonic acid, phosphinic acid, sulphamic acid; derivatives thereof or combinations thereof.
7. The method of claim 1 wherein the acid precursor comprises diethylene glycol diformate.
8. The method of claim 1 wherein the acid precursor is present in the composition in an amount of from about 5% to about 50% based on total volume of the composition.
9. The method of claim 1 wherein the aqueous fluid comprises a brine.
10. The method of claim 9 wherein the brine comprises NaCl, NaBr, CaCl2, CaBr2, ZrBr2, sodium formate, potassium formate, cesium formate, or combinations thereof.
11. The method of claim 9 wherein the brine is present in the composition in an amount of from about 40 wt.% to about 90 wt.% based on total weight of the composition.
12. The method of claim 1 wherein the mutual solvent precursor and the acid precursor are the same or a combination of compounds.
13. The method of claim 12 wherein the same compound comprises a formate ester.
14. The method of claim 13 wherein the formate ester comprises ethylene glycol monobutyl ether formate, diethylene glycol monobutyl ether formate or combinations thereof.
15. The method of claim 1 wherein the composition further comprises a rate adjusting material.
16. The method of claim 15 wherein the rate adjusting material comprises diethyleneglycol monoformate, diethyleneglycol diformate, monoethyleneglycol diformate, monoethyleneglycol monoformate, derivatives thereof or combinations thereof.
17. The method of claim 15 wherein the rate adjusting material is present in an amount of from about 0.1% to about saturation.
18. The method of claim 1 wherein the oil wet solids comprise a filtercake.
19. A method of servicing a wellbore comprising: introducing an oil-based fluid into a wellbore, wherein the oil-based fluid forms oil wet solids in the wellbore; contacting the oil wet solids in the wellbore with a composition comprising a mutual solvent precursor; an acid precursor and an aqueous fluid;

and allowing the oil wet solids to become water wet.
20. The method of claim 19 wherein the oil wet solids are delayed in becoming water wet following contact with the composition.
21. The method of claim 20 wherein the delay is from about 2 to about 96 hours.
22. The method of claim 19 wherein the oil-based fluid is a drilling fluid and the oil wet solids comprise a filtercake.
23. The method of claim 19 wherein the mutual solvent precursor comprises an ester of ethylene glycol monobutyl ether and the acid precursor comprises diethylene glycol diformate.
24. The method of claim 19 wherein a formate ester comprises both the mutual solvent precursor and the acid precursor.
25. A method of servicing a well bore comprising:

contacting a composition comprising a formate ester with oil wet solids in the well bore under conditions wherein the formate ester hydrolyzes to release formic acid, wherein the formic acid catalyzes the hydrolysis of additional formate ester, and wherein all or a portion of the formate ester converts at least a portion of the oil-wet solids to water-wet solids.
26. A method of servicing a wellbore comprising:
providing a composition comprising a mutual solvent precursor, an acid, and an aqueous fluid; and contacting the composition with oil wet solids in the wellbore.
CA2723856A 2008-05-13 2009-05-11 Compositions and methods for the removal of oil-based filtercakes Expired - Fee Related CA2723856C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12/120,159 2008-05-13
US12/120,159 US7906464B2 (en) 2008-05-13 2008-05-13 Compositions and methods for the removal of oil-based filtercakes
PCT/GB2009/001183 WO2009138733A1 (en) 2008-05-13 2009-05-11 Compositions and methods for the removal of oil-based filtercakes

Publications (2)

Publication Number Publication Date
CA2723856A1 CA2723856A1 (en) 2009-11-19
CA2723856C true CA2723856C (en) 2013-12-31

Family

ID=40802036

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2723856A Expired - Fee Related CA2723856C (en) 2008-05-13 2009-05-11 Compositions and methods for the removal of oil-based filtercakes

Country Status (12)

Country Link
US (1) US7906464B2 (en)
EP (1) EP2300557A1 (en)
AU (1) AU2009247832B9 (en)
BR (1) BRPI0912765A2 (en)
CA (1) CA2723856C (en)
CO (1) CO6351804A2 (en)
EA (1) EA026273B1 (en)
EC (1) ECSP10010658A (en)
EG (1) EG26739A (en)
MX (1) MX2010012403A (en)
MY (1) MY151226A (en)
WO (1) WO2009138733A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109651869A (en) * 2018-11-30 2019-04-19 柏晨化工科技张家港保税区有限公司 A kind of plastic cement paint stripper and preparation method thereof
US10550319B2 (en) 2013-04-05 2020-02-04 Halliburton Energy Services, Inc. Wellbore servicing compositions and methods of making and using same

Families Citing this family (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7833943B2 (en) 2008-09-26 2010-11-16 Halliburton Energy Services Inc. Microemulsifiers and methods of making and using same
US9222013B1 (en) 2008-11-13 2015-12-29 Cesi Chemical, Inc. Water-in-oil microemulsions for oilfield applications
US10012061B2 (en) * 2010-05-10 2018-07-03 Soane Energy, Llc Formulations and methods for removing hydrocarbons from surfaces
WO2012001396A1 (en) * 2010-06-28 2012-01-05 M-I Drilling Fluids U.K. Limited Method of removing water-based filter cake
DE102010048953A1 (en) * 2010-10-19 2012-04-19 Dc Plus Beteiligungs Gmbh Dampening solution additive for offset printing presses
US9102860B2 (en) * 2011-06-16 2015-08-11 Baker Hughes Incorporated Method of inhibiting or controlling release of well treatment agent
US20130081826A1 (en) * 2011-09-29 2013-04-04 Saudi Arabian Oil Company In-situ generated buffer system
WO2013076242A2 (en) * 2011-11-23 2013-05-30 Schlumberger Norge As Test equipment simulating multiple fluid sequences
US9206673B2 (en) * 2012-04-09 2015-12-08 Halliburton Energy Services, Inc. Wellbore servicing fluid system and methods of use
US20130292121A1 (en) 2012-04-15 2013-11-07 Cesi Chemical, Inc. Surfactant formulations for foam flooding
CN102634330B (en) * 2012-04-20 2013-08-07 唐山冀油瑞丰化工有限公司 Preparation method of multi-hydrogen acid for oil and gas reservoir
US9200192B2 (en) 2012-05-08 2015-12-01 Cesi Chemical, Inc. Compositions and methods for enhancement of production of liquid and gaseous hydrocarbons
US11407930B2 (en) 2012-05-08 2022-08-09 Flotek Chemistry, Llc Compositions and methods for enhancement of production of liquid and gaseous hydrocarbons
GB2517114B (en) * 2012-05-31 2018-02-14 M-I L L C Surface active additives for oil-based mud filter cake breakers
GB2520849B (en) * 2012-07-09 2016-01-20 Mi Llc Wellbore fluid used with oil-swellable elements
US9890321B2 (en) 2012-10-22 2018-02-13 Halliburton Energy Services, Inc. Wellbore servicing compositions and methods of making and using same
US9428683B2 (en) 2013-03-14 2016-08-30 Flotek Chemistry, Llc Methods and compositions for stimulating the production of hydrocarbons from subterranean formations
US10053619B2 (en) 2013-03-14 2018-08-21 Flotek Chemistry, Llc Siloxane surfactant additives for oil and gas applications
US9068108B2 (en) 2013-03-14 2015-06-30 Cesi Chemical, Inc. Methods and compositions for stimulating the production of hydrocarbons from subterranean formations
US11180690B2 (en) 2013-03-14 2021-11-23 Flotek Chemistry, Llc Diluted microemulsions with low surface tensions
US9321955B2 (en) 2013-06-14 2016-04-26 Flotek Chemistry, Llc Methods and compositions for stimulating the production of hydrocarbons from subterranean formations
US10717919B2 (en) 2013-03-14 2020-07-21 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells
US10421707B2 (en) 2013-03-14 2019-09-24 Flotek Chemistry, Llc Methods and compositions incorporating alkyl polyglycoside surfactant for use in oil and/or gas wells
US9868893B2 (en) 2013-03-14 2018-01-16 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells
US10590332B2 (en) 2013-03-14 2020-03-17 Flotek Chemistry, Llc Siloxane surfactant additives for oil and gas applications
US9884988B2 (en) 2013-03-14 2018-02-06 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells
US11254856B2 (en) 2013-03-14 2022-02-22 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells
US9464223B2 (en) 2013-03-14 2016-10-11 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells
US10287483B2 (en) 2013-03-14 2019-05-14 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells comprising a terpene alcohol
US10577531B2 (en) 2013-03-14 2020-03-03 Flotek Chemistry, Llc Polymers and emulsions for use in oil and/or gas wells
US10000693B2 (en) 2013-03-14 2018-06-19 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells
US10941106B2 (en) 2013-03-14 2021-03-09 Flotek Chemistry, Llc Methods and compositions incorporating alkyl polyglycoside surfactant for use in oil and/or gas wells
US9745504B2 (en) 2013-03-21 2017-08-29 Halliburton Energy Services, Inc. Wellbore servicing compositions and methods of making and using same
US9512348B2 (en) 2013-03-28 2016-12-06 Halliburton Energy Services, Inc. Removal of inorganic deposition from high temperature formations with non-corrosive acidic pH fluids
WO2014176227A1 (en) * 2013-04-22 2014-10-30 M-I L.L.C. Use of chelants in formate-based solutions to dissolve residual filtercakes in subterranean wells
US9284479B2 (en) 2013-06-22 2016-03-15 Halliburton Energy Services, Inc. Invert emulsion for swelling elastomer and filtercake removal in a well
US20140378353A1 (en) * 2013-06-24 2014-12-25 Halliburton Energy Services, Inc. Inhibiting Salting Out of Diutan or Scleroglucan in Well Treatment
US20150065399A1 (en) * 2013-08-27 2015-03-05 Ramesh Varadaraj Methods and Compositions for Enhanced Acid Stimulation of Carbonate and Sand Stone Formations
US9890625B2 (en) 2014-02-28 2018-02-13 Eclipse Ior Services, Llc Systems and methods for the treatment of oil and/or gas wells with an obstruction material
US9890624B2 (en) 2014-02-28 2018-02-13 Eclipse Ior Services, Llc Systems and methods for the treatment of oil and/or gas wells with a polymeric material
AU2014390017B2 (en) 2014-04-09 2017-03-02 Halliburton Energy Services, Inc. Water-soluble linear polyphosphazenes in water-based fluids for use in wells or pipelines
US9505970B2 (en) 2014-05-14 2016-11-29 Flotek Chemistry, Llc Methods and compositions for use in oil and/or gas wells
CA2950694C (en) 2014-07-09 2019-04-02 Halliburton Energy Services, Inc. Treatment fluids for reducing subterranean formation damage
CA2955193C (en) 2014-07-15 2023-03-14 Sasol Performance Chemicals Gmbh Ether-containing compositions for treating oil and gas wells
US10711175B2 (en) * 2014-07-15 2020-07-14 Sasol Performance Chemicals Gmbh Compositions and methods for controlling paraffin and asphaltene problems in wells
US9957779B2 (en) 2014-07-28 2018-05-01 Flotek Chemistry, Llc Methods and compositions related to gelled layers in oil and/or gas wells
US10184329B2 (en) * 2014-10-14 2019-01-22 Baker Hughes, A Ge Company, Llc Microemulsions, mesophase surfactant and micellar solutions, and in situ-formed fluids formulated with high density brine
WO2017218812A1 (en) * 2016-06-17 2017-12-21 Shrieve Chemical Products, Inc. Compositions and methods for preparation and utilization of acid-generating materials
EP3565866A4 (en) 2017-01-06 2020-01-01 M-I-L.L.C. Breaker fluids and methods of use thereof
GB2572904B (en) * 2017-03-03 2022-06-22 Halliburton Energy Services Inc Downhole fluids containing cyclic orthoesters and brine and methods for using the same
WO2018187565A1 (en) 2017-04-07 2018-10-11 Saudi Arabian Oil Company Compositions and methods for controlled delivery of acid
MA49462A (en) * 2017-06-23 2020-04-29 Saudi Arabian Oil Co COMPOSITIONS AND METHODS FOR CONTROLLING STRONG ACID SYSTEMS
US10934472B2 (en) 2017-08-18 2021-03-02 Flotek Chemistry, Llc Compositions comprising non-halogenated solvents for use in oil and/or gas wells and related methods
WO2019108971A1 (en) 2017-12-01 2019-06-06 Flotek Chemistry, Llc Methods and compositions for stimulating the production of hydrocarbons from subterranean formations
US10934474B2 (en) 2018-09-13 2021-03-02 Baker Hughes Holdings Llc Method to generate acidic species in wellbore fluids
US11268007B2 (en) 2018-09-15 2022-03-08 Ingevity South Carolina, Llc Lignin derivatives based drilling fluid additive
WO2020076993A1 (en) 2018-10-10 2020-04-16 Saudi Arabian Oil Company Methods for delivering in-situ generated acids for stimulation of downhole structures
US11104843B2 (en) 2019-10-10 2021-08-31 Flotek Chemistry, Llc Well treatment compositions and methods comprising certain microemulsions and certain clay control additives exhibiting synergistic effect of enhancing clay swelling protection and persistency
US11319477B2 (en) 2019-10-16 2022-05-03 Halliburton Energy Services, Inc. Breaker additives for extended delay in removal of oil-based filter cakes
WO2022029692A1 (en) 2020-08-06 2022-02-10 Saudi Arabian Oil Company Compositions and methods for controlled delivery of acid using sulfonate derivatives
US11512243B2 (en) 2020-10-23 2022-11-29 Flotek Chemistry, Llc Microemulsions comprising an alkyl propoxylated sulfate surfactant, and related methods
US11492539B1 (en) 2021-10-28 2022-11-08 Halliburton Energy Services, Inc. Acid generation for filtercake removal in subterranean applications
US11952533B2 (en) * 2021-11-17 2024-04-09 Halliburton Energy Services, Inc. Filter cake removal compositions and methods of making and using same
US11584878B1 (en) 2021-12-16 2023-02-21 Halliburton Energy Services, Inc. Acid precursors for enhanced inhibitor placement in scale squeeze treatments

Family Cites Families (358)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922154A (en) 1933-01-09 1933-08-15 Tretolite Co Process for increasing the output of oil wells
US2050392A (en) 1933-07-13 1936-08-11 Starr Sweetland Corp Fuel injector
US2059459A (en) 1936-06-05 1936-11-03 Walter J Hund Method of treating wells with acids
US2206187A (en) 1937-06-19 1940-07-02 Ind Patents Ltd Method of increasing production of oil wells
US2238671A (en) 1940-02-09 1941-04-15 Du Pont Method of treating wells
US2703316A (en) 1951-06-05 1955-03-01 Du Pont Polymers of high melting lactide
US2681889A (en) 1951-12-29 1954-06-22 Stanolind Oil & Gas Co Emulsified acids for well treating
US2910436A (en) 1953-10-02 1959-10-27 California Research Corp Method of treating wells with acid
US2863832A (en) 1954-05-14 1958-12-09 California Research Corp Method of acidizing petroliferous formations
US3173484A (en) 1958-09-02 1965-03-16 Gulf Research Development Co Fracturing process employing a heterogeneous propping agent
US3272650A (en) 1963-02-21 1966-09-13 Union Carbide Corp Process for cleaning conduits
US3195635A (en) 1963-05-23 1965-07-20 Pan American Petroleum Corp Spacers for fracture props
US3302719A (en) 1965-01-25 1967-02-07 Union Oil Co Method for treating subterranean formations
US3366178A (en) 1965-09-10 1968-01-30 Halliburton Co Method of fracturing and propping a subterranean formation
US3455390A (en) 1965-12-03 1969-07-15 Union Oil Co Low fluid loss well treating composition and method
US3364995A (en) 1966-02-14 1968-01-23 Dow Chemical Co Hydraulic fracturing fluid-bearing earth formations
US3548945A (en) 1969-02-03 1970-12-22 Exxon Production Research Co Method for acidizing siliceous formations
US3481404A (en) 1969-02-03 1969-12-02 Exxon Production Research Co Sandstone acidizing process
US3630285A (en) 1970-05-22 1971-12-28 Amoco Prod Co Acidizing high-temperature wells
US3784585A (en) 1971-10-21 1974-01-08 American Cyanamid Co Water-degradable resins containing recurring,contiguous,polymerized glycolide units and process for preparing same
US3747681A (en) 1972-05-26 1973-07-24 Marathon Oil Co Hydraulic fracturing process using polyethylene oxide based fracturing fluid
US3819525A (en) 1972-08-21 1974-06-25 Avon Prod Inc Cosmetic cleansing preparation
US3828854A (en) 1973-04-16 1974-08-13 Shell Oil Co Dissolving siliceous materials with self-acidifying liquid
US3912692A (en) 1973-05-03 1975-10-14 American Cyanamid Co Process for polymerizing a substantially pure glycolide composition
US3968840A (en) 1973-05-25 1976-07-13 Texaco Inc. Controlled rate acidization process
US3948672A (en) 1973-12-28 1976-04-06 Texaco Inc. Permeable cement composition and method
US3955993A (en) 1973-12-28 1976-05-11 Texaco Inc. Method and composition for stabilizing incompetent oil-containing formations
US3868998A (en) 1974-05-15 1975-03-04 Shell Oil Co Self-acidifying treating fluid positioning process
US3960736A (en) 1974-06-03 1976-06-01 The Dow Chemical Company Self-breaking viscous aqueous solutions and the use thereof in fracturing subterranean formations
US4172066A (en) 1974-06-21 1979-10-23 The Dow Chemical Company Cross-linked, water-swellable polymer microgels
US3986355A (en) 1974-08-15 1976-10-19 Klaeger Joseph H Well head gas counter balanced and operated actuator for oil well pumps
US4010071A (en) 1974-10-10 1977-03-01 Merck & Co., Inc. Clarification of xanthan gum
US3998744A (en) 1975-04-16 1976-12-21 Standard Oil Company Oil fracturing spacing agents
US3998272A (en) 1975-04-21 1976-12-21 Union Oil Company Of California Method of acidizing wells
CA1045027A (en) 1975-09-26 1978-12-26 Walter A. Hedden Hydraulic fracturing method using sintered bauxite propping agent
US4169798A (en) 1976-11-26 1979-10-02 Celanese Corporation Well-treating compositions
US4136739A (en) 1977-08-19 1979-01-30 Exxon Production Research Company Method for generating hydrofluoric acid in a subterranean formation
US4265673A (en) 1978-06-23 1981-05-05 Talres Development (N.A.) N.V. Polymer solutions for use in oil recovery containing a complexing agent for multivalentions
GB2032491B (en) 1978-08-09 1982-11-10 Elf Aquitaine Well spacer fluids
US4252421A (en) 1978-11-09 1981-02-24 John D. McCarry Contact lenses with a colored central area
US4267887A (en) 1979-02-22 1981-05-19 Union Oil Company Of California Method for acidizing high temperature subterranean formations
US4299825A (en) 1980-07-03 1981-11-10 Celanese Corporation Concentrated xanthan gum solutions
US4502540A (en) 1981-06-01 1985-03-05 Mobil Oil Corporation Tertiary oil recovery
US4526695A (en) 1981-08-10 1985-07-02 Exxon Production Research Co. Composition for reducing the permeability of subterranean formations
US4716964A (en) 1981-08-10 1988-01-05 Exxon Production Research Company Use of degradable ball sealers to seal casing perforations in well treatment fluid diversion
US4387769A (en) 1981-08-10 1983-06-14 Exxon Production Research Co. Method for reducing the permeability of subterranean formations
US4460052A (en) 1981-08-10 1984-07-17 Judith Gockel Prevention of lost circulation of drilling muds
US4498995A (en) 1981-08-10 1985-02-12 Judith Gockel Lost circulation drilling fluid
DE3237766A1 (en) 1981-10-13 1983-05-19 Loyd W. 74132 Tulsa Okla. Jones DRILL HOLE ACIDIFICATION ADDITIVE FROM PHOSPHORIC ACID ESTER AND ALCOHOL
GB2116966B (en) 1982-02-26 1986-01-15 British Petroleum Co Plc N-oxyalkylated aqueous compositions of quaternary ammenium salt surfactants
US4470915A (en) 1982-09-27 1984-09-11 Halliburton Company Method and compositions for fracturing subterranean formations
US4521316A (en) 1983-03-11 1985-06-04 Fmc Corporation Oil well completion fluid
US4506734A (en) 1983-09-07 1985-03-26 The Standard Oil Company Fracturing fluid breaker system which is activated by fracture closure
GB2163790B (en) 1984-08-28 1988-02-24 Dow Chemical Co Methods for acidizing subterranean formations and gelled acid compositions
FR2580666B1 (en) 1985-04-19 1988-01-15 Elf Aquitaine IMPROVEMENT IN IMMOBILIZATION OF ENZYMES
US4632876A (en) 1985-06-12 1986-12-30 Minnesota Mining And Manufacturing Company Ceramic spheroids having low density and high crush resistance
US4715967A (en) 1985-12-27 1987-12-29 E. I. Du Pont De Nemours And Company Composition and method for temporarily reducing permeability of subterranean formations
US4772346A (en) 1986-02-14 1988-09-20 International Business Machines Corporation Method of bonding inorganic particulate material
US4713183A (en) 1986-03-12 1987-12-15 Dresser Industries, Inc. Oil based drilling fluid reversion
US4785884A (en) 1986-05-23 1988-11-22 Acme Resin Corporation Consolidation of partially cured resin coated particulate material
US4694905A (en) 1986-05-23 1987-09-22 Acme Resin Corporation Precured coated particulate material
US4693808A (en) 1986-06-16 1987-09-15 Shell Oil Company Downflow fluidized catalytic cranking reactor process and apparatus with quick catalyst separation means in the bottom thereof
US4737295A (en) 1986-07-21 1988-04-12 Venture Chemicals, Inc. Organophilic polyphenolic acid adducts
MX168601B (en) 1986-10-01 1993-06-01 Air Prod & Chem PROCEDURE FOR THE PREPARATION OF A HIGH MOLECULAR WEIGHT VINYLAMINE HOMOPOLYMER
CA1279469C (en) 1987-01-27 1991-01-29 Curtis W. Crowe Composition and method for fluid loss control in acid fracturing of earthen formations
US4793416A (en) 1987-06-30 1988-12-27 Mobile Oil Corporation Organic crosslinking of polymers for CO2 flooding profile control
US4894231A (en) 1987-07-28 1990-01-16 Biomeasure, Inc. Therapeutic agent delivery system
US4836940A (en) 1987-09-14 1989-06-06 American Colloid Company Composition and method of controlling lost circulation from wellbores
US4829100A (en) 1987-10-23 1989-05-09 Halliburton Company Continuously forming and transporting consolidatable resin coated particulate materials in aqueous gels
US4817721A (en) 1987-12-14 1989-04-04 Conoco Inc. Reducing the permeability of a rock formation
US5152781A (en) 1987-12-17 1992-10-06 Allied-Signal Inc. Medical devices fabricated from homopolymers and copolymers having recurring carbonate units
US4809783A (en) 1988-01-14 1989-03-07 Halliburton Services Method of dissolving organic filter cake
US4957165A (en) 1988-02-16 1990-09-18 Conoco Inc. Well treatment process
US4848467A (en) 1988-02-16 1989-07-18 Conoco Inc. Formation fracturing process
US4822500A (en) 1988-02-29 1989-04-18 Texas United Chemical Corporation Saturated brine well treating fluids and additives therefore
US4886354A (en) 1988-05-06 1989-12-12 Conoco Inc. Method and apparatus for measuring crystal formation
US6323307B1 (en) 1988-08-08 2001-11-27 Cargill Dow Polymers, Llc Degradation control of environmentally degradable disposable materials
US5216050A (en) 1988-08-08 1993-06-01 Biopak Technology, Ltd. Blends of polyactic acid
US4986354A (en) 1988-09-14 1991-01-22 Conoco Inc. Composition and placement process for oil field chemicals
US4986353A (en) 1988-09-14 1991-01-22 Conoco Inc. Placement process for oil field chemicals
US4961466A (en) 1989-01-23 1990-10-09 Halliburton Company Method for effecting controlled break in polysaccharide gels
US4986355A (en) 1989-05-18 1991-01-22 Conoco Inc. Process for the preparation of fluid loss additive and gel breaker
US5034139A (en) 1989-06-19 1991-07-23 Nalco Chemical Company Polymer composition comprising phosphorous-containing gelling agent and process thereof
US5487897A (en) 1989-07-24 1996-01-30 Atrix Laboratories, Inc. Biodegradable implant precursor
US5464060A (en) 1989-12-27 1995-11-07 Shell Oil Company Universal fluids for drilling and cementing wells
JPH05503934A (en) 1990-01-30 1993-06-24 アクゾ・エヌ・ヴエー Article for controlled delivery of active substances, consisting of a hollow space completely surrounded by walls and filled in whole or in part with one or more active substances
US5082056A (en) 1990-10-16 1992-01-21 Marathon Oil Company In situ reversible crosslinked polymer gel used in hydrocarbon recovery applications
FR2668490B1 (en) 1990-10-29 1994-04-29 Elf Aquitaine SCLEROGLUCANE GEL APPLIES TO THE OIL INDUSTRY.
US5203834A (en) 1990-12-21 1993-04-20 Union Oil Company Of California Foamed gels having selective permeability
US5213446A (en) 1991-01-31 1993-05-25 Union Oil Company Of California Drilling mud disposal technique
GB9108665D0 (en) 1991-04-23 1991-06-12 Unilever Plc Liquid cleaning products
US5161615A (en) 1991-06-27 1992-11-10 Union Oil Company Of California Method for reducing water production from wells
CA2128509C (en) 1992-01-24 2006-09-19 Patrick R. Gruber Continuous process for manufacture of lactide polymers with improved purification methods
US6326458B1 (en) 1992-01-24 2001-12-04 Cargill, Inc. Continuous process for the manufacture of lactide and lactide polymers
US5247059A (en) 1992-01-24 1993-09-21 Cargill, Incorporated Continuous process for the manufacture of a purified lactide from esters of lactic acid
US5142023A (en) 1992-01-24 1992-08-25 Cargill, Incorporated Continuous process for manufacture of lactide polymers with controlled optical purity
US5251697A (en) 1992-03-25 1993-10-12 Chevron Research And Technology Company Method of preventing in-depth formation damage during injection of water into a formation
US5249628A (en) 1992-09-29 1993-10-05 Halliburton Company Horizontal well completions
US5396957A (en) 1992-09-29 1995-03-14 Halliburton Company Well completions with expandable casing portions
US5325923A (en) 1992-09-29 1994-07-05 Halliburton Company Well completions with expandable casing portions
ES2123668T3 (en) 1992-10-02 1999-01-16 Cargill Inc PAPER WHICH HAS A STABLE CAST LACTIDE POLYMER COATING AND PROCEDURE FOR ITS MANUFACTURE.
US5338822A (en) 1992-10-02 1994-08-16 Cargill, Incorporated Melt-stable lactide polymer composition and process for manufacture thereof
DK0615555T3 (en) 1992-10-02 2001-07-09 Cargill Inc Textile material of melt-stable lactide polymer and process for preparation thereof
US5295542A (en) 1992-10-05 1994-03-22 Halliburton Company Well gravel packing methods
US5314031A (en) 1992-10-22 1994-05-24 Shell Oil Company Directional drilling plug
US5363916A (en) 1992-12-21 1994-11-15 Halliburton Company Method of gravel packing a well
US5304620A (en) 1992-12-21 1994-04-19 Halliburton Company Method of crosslinking cellulose and guar derivatives for treating subterranean formations
US5316587A (en) 1993-01-21 1994-05-31 Church & Dwight Co., Inc. Water soluble blast media containing surfactant
JPH06225848A (en) 1993-02-01 1994-08-16 Tootaru Service:Kk Cleaning method for outer wall surface of building
CA2119316C (en) 1993-04-05 2006-01-03 Roger J. Card Control of particulate flowback in subterranean wells
US5330005A (en) 1993-04-05 1994-07-19 Dowell Schlumberger Incorporated Control of particulate flowback in subterranean wells
US5360068A (en) 1993-04-19 1994-11-01 Mobil Oil Corporation Formation fracturing
GB9308884D0 (en) 1993-04-29 1993-06-16 Archaeus Tech Group Acidising oil reservoirs
US5373901A (en) 1993-07-27 1994-12-20 Halliburton Company Encapsulated breakers and method for use in treating subterranean formations
US5359026A (en) 1993-07-30 1994-10-25 Cargill, Incorporated Poly(lactide) copolymer and process for manufacture thereof
US5386874A (en) 1993-11-08 1995-02-07 Halliburton Company Perphosphate viscosity breakers in well fracture fluids
US5402846A (en) 1993-11-15 1995-04-04 Mobil Oil Corporation Unique method of hydraulic fracturing
DE69426970T2 (en) 1993-11-27 2001-09-13 Aea Technology Plc Didcot Process of treating an oil well
US5607905A (en) 1994-03-15 1997-03-04 Texas United Chemical Company, Llc. Well drilling and servicing fluids which deposit an easily removable filter cake
US5460226A (en) 1994-05-18 1995-10-24 Shell Oil Company Formation fracturing
GB9411269D0 (en) 1994-06-06 1994-07-27 Archaeus Tech Group Delayed acid for gel breaking
US5499678A (en) 1994-08-02 1996-03-19 Halliburton Company Coplanar angular jetting head for well perforating
US5501276A (en) 1994-09-15 1996-03-26 Halliburton Company Drilling fluid and filter cake removal methods and compositions
US5492177A (en) 1994-12-01 1996-02-20 Mobil Oil Corporation Method for consolidating a subterranean formation
US5591700A (en) 1994-12-22 1997-01-07 Halliburton Company Fracturing fluid with encapsulated breaker
US5604186A (en) 1995-02-15 1997-02-18 Halliburton Company Encapsulated enzyme breaker and method for use in treating subterranean formations
GB9503949D0 (en) 1995-02-28 1995-04-19 Atomic Energy Authority Uk Oil well treatment
US5775425A (en) 1995-03-29 1998-07-07 Halliburton Energy Services, Inc. Control of fine particulate flowback in subterranean wells
US6047772A (en) 1995-03-29 2000-04-11 Halliburton Energy Services, Inc. Control of particulate flowback in subterranean wells
US5833000A (en) 1995-03-29 1998-11-10 Halliburton Energy Services, Inc. Control of particulate flowback in subterranean wells
US6209643B1 (en) 1995-03-29 2001-04-03 Halliburton Energy Services, Inc. Method of controlling particulate flowback in subterranean wells and introducing treatment chemicals
US5602083A (en) 1995-03-31 1997-02-11 Baker Hughes Inc. Use of sized salts as bridging agent for oil based fluids
US5497830A (en) 1995-04-06 1996-03-12 Bj Services Company Coated breaker for crosslinked acid
US5613558A (en) 1995-06-02 1997-03-25 Bj Services Company Method for controlling the set time of cement
US5670473A (en) 1995-06-06 1997-09-23 Sunburst Chemicals, Inc. Solid cleaning compositions based on hydrated salts
US6143211A (en) 1995-07-21 2000-11-07 Brown University Foundation Process for preparing microparticles through phase inversion phenomena
US6028113A (en) 1995-09-27 2000-02-22 Sunburst Chemicals, Inc. Solid sanitizers and cleaner disinfectants
US5849401A (en) 1995-09-28 1998-12-15 Cargill, Incorporated Compostable multilayer structures, methods for manufacture, and articles prepared therefrom
US5697440A (en) 1996-01-04 1997-12-16 Halliburton Energy Services, Inc. Control of particulate flowback in subterranean wells
US5985312A (en) 1996-01-26 1999-11-16 Brown University Research Foundation Methods and compositions for enhancing the bioadhesive properties of polymers
US5799734A (en) 1996-07-18 1998-09-01 Halliburton Energy Services, Inc. Method of forming and using particulate slurries for well completion
US5888944A (en) 1996-08-02 1999-03-30 Mi L.L.C. Oil-based drilling fluid
US5905061A (en) 1996-08-02 1999-05-18 Patel; Avind D. Invert emulsion fluids suitable for drilling
US6589917B2 (en) 1996-08-02 2003-07-08 M-I Llc Invert emulsion drilling fluids and muds having negative alkalinity and elastomer compatibility
US20040072696A1 (en) 1996-08-02 2004-04-15 M-I Llc. Invert emulsion fluids having negative alkalinity
US6218342B1 (en) 1996-08-02 2001-04-17 M-I Llc Oil-based drilling fluid
US6806233B2 (en) 1996-08-02 2004-10-19 M-I Llc Methods of using reversible phase oil based drilling fluid
US5964295A (en) * 1996-10-09 1999-10-12 Schlumberger Technology Corporation, Dowell Division Methods and compositions for testing subterranean formations
US6667279B1 (en) 1996-11-13 2003-12-23 Wallace, Inc. Method and composition for forming water impermeable barrier
US5698322A (en) 1996-12-02 1997-12-16 Kimberly-Clark Worldwide, Inc. Multicomponent fiber
US5762138A (en) 1996-12-09 1998-06-09 Halliburton Energy Services, Inc. Method of preventing incompatibility between aqueous well treating fluids and hydrocarbons
US5765642A (en) 1996-12-23 1998-06-16 Halliburton Energy Services, Inc. Subterranean formation fracturing methods
US5881826A (en) 1997-02-13 1999-03-16 Actisystems, Inc. Aphron-containing well drilling and servicing fluids
US6123159A (en) 1997-02-13 2000-09-26 Actisystems, Inc. Aphron-containing well drilling and servicing fluids of enhanced stability
US6110875A (en) 1997-03-07 2000-08-29 Bj Services Company Methods and materials for degrading xanthan
US5791415A (en) 1997-03-13 1998-08-11 Halliburton Energy Services, Inc. Stimulating wells in unconsolidated formations
US5723416A (en) 1997-04-01 1998-03-03 Liao; W. Andrew Well servicing fluid for trenchless directional drilling
US6169058B1 (en) 1997-06-05 2001-01-02 Bj Services Company Compositions and methods for hydraulic fracturing
US6258859B1 (en) 1997-06-10 2001-07-10 Rhodia, Inc. Viscoelastic surfactant fluids and related methods of use
US5924488A (en) 1997-06-11 1999-07-20 Halliburton Energy Services, Inc. Methods of preventing well fracture proppant flow-back
US5908073A (en) 1997-06-26 1999-06-01 Halliburton Energy Services, Inc. Preventing well fracture proppant flow-back
US6004400A (en) 1997-07-09 1999-12-21 Phillip W. Bishop Carbon dioxide cleaning process
CA2296357C (en) 1997-07-23 2006-07-04 Cleansorb Limited Methods for deposition of materials in underground reservoirs
AU738096B2 (en) 1997-08-15 2001-09-06 Halliburton Energy Services, Inc. Light weight high temperature well cement compositions and methods
US6302209B1 (en) 1997-09-10 2001-10-16 Bj Services Company Surfactant compositions and uses therefor
US5909774A (en) 1997-09-22 1999-06-08 Halliburton Energy Services, Inc. Synthetic oil-water emulsion drill-in fluid cleanup methods
FR2768732B1 (en) 1997-09-25 2003-10-24 Inst Francais Du Petrole PROCESS FOR THE MANUFACTURE OF AN EMULSIFYING AND DISPERSING SURFACE AGENT FROM POLYMERIZED OIL AND AMINO ALCOHOL
AU7600198A (en) 1997-11-21 1999-06-15 Bj Services Company Formation treatment method using deformable particles
US6135987A (en) 1997-12-22 2000-10-24 Kimberly-Clark Worldwide, Inc. Synthetic fiber
EP0926310A1 (en) 1997-12-24 1999-06-30 Shell Internationale Researchmaatschappij B.V. Apparatus and method for injecting treatment fluids into an underground formation
US6308788B1 (en) 1998-01-08 2001-10-30 M-I Llc Conductive medium for openhole logging and logging while drilling
US6405809B2 (en) 1998-01-08 2002-06-18 M-I Llc Conductive medium for openhold logging and logging while drilling
US6029755A (en) 1998-01-08 2000-02-29 M-I L.L.C. Conductive medium for openhole logging and logging while drilling
US6793025B2 (en) 1998-01-08 2004-09-21 M-I L. L. C. Double emulsion based drilling fluids
US5990050A (en) 1998-01-08 1999-11-23 M-I L.L.C. Water soluble invert emulsions
US6162766A (en) 1998-05-29 2000-12-19 3M Innovative Properties Company Encapsulated breakers, compositions and methods of use
US6024170A (en) 1998-06-03 2000-02-15 Halliburton Energy Services, Inc. Methods of treating subterranean formation using borate cross-linking compositions
US6114410A (en) 1998-07-17 2000-09-05 Technisand, Inc. Proppant containing bondable particles and removable particles
US6686328B1 (en) 1998-07-17 2004-02-03 The Procter & Gamble Company Detergent tablet
US5916849A (en) 1998-07-24 1999-06-29 Venture Innovations, Inc. Polysaccharide-containing well drilling and servicing fluids
US6148917A (en) 1998-07-24 2000-11-21 Actisystems, Inc. Method of releasing stuck pipe or tools and spotting fluids therefor
GB2340147A (en) 1998-07-30 2000-02-16 Sofitech Nv Wellbore fluid
US6620437B2 (en) 1998-07-30 2003-09-16 Colgate-Palmolive Co. Water-in-oil microemulsion for providing cosmetic attributes to fabric softening base composition
US6242390B1 (en) 1998-07-31 2001-06-05 Schlumberger Technology Corporation Cleanup additive
US6131661A (en) 1998-08-03 2000-10-17 Tetra Technologies Inc. Method for removing filtercake
US5996693A (en) 1998-09-15 1999-12-07 Halliburton Energy Services, Inc. Methods and compositions for cementing pipe in well bores
DE19852971A1 (en) 1998-11-17 2000-05-18 Cognis Deutschland Gmbh Lubricants for drilling fluids
US6189615B1 (en) 1998-12-15 2001-02-20 Marathon Oil Company Application of a stabilized polymer gel to an alkaline treatment region for improved hydrocarbon recovery
US6140277A (en) 1998-12-31 2000-10-31 Schlumberger Technology Corporation Fluids and techniques for hydrocarbon well completion
US20030130133A1 (en) 1999-01-07 2003-07-10 Vollmer Daniel Patrick Well treatment fluid
US6599863B1 (en) 1999-02-18 2003-07-29 Schlumberger Technology Corporation Fracturing process and composition
US6234251B1 (en) 1999-02-22 2001-05-22 Halliburton Energy Services, Inc. Resilient well cement compositions and methods
GB9906484D0 (en) 1999-03-19 1999-05-12 Cleansorb Ltd Method for treatment of underground reservoirs
US6380138B1 (en) 1999-04-06 2002-04-30 Fairmount Minerals Ltd. Injection molded degradable casing perforation ball sealers fluid loss additive and method of use
US6209646B1 (en) 1999-04-21 2001-04-03 Halliburton Energy Services, Inc. Controlling the release of chemical additives in well treating fluids
US6291013B1 (en) 1999-05-03 2001-09-18 Southern Biosystems, Inc. Emulsion-based processes for making microparticles
HUP0201204A3 (en) 1999-05-21 2004-07-28 Cargill Dow Llc Minnetonka Methods and materials for synthesis of organic products
US6387986B1 (en) 1999-06-24 2002-05-14 Ahmad Moradi-Araghi Compositions and processes for oil field applications
GB9915354D0 (en) 1999-07-02 1999-09-01 Cleansorb Ltd Method for treatment of underground reservoirs
US6454004B2 (en) 1999-07-15 2002-09-24 Halliburton Energy Services, Inc. Cementing casing strings in deep water offshore wells
US6300286B1 (en) 1999-08-05 2001-10-09 Texas United Chemical Company, L.L.C. Divalent cation-containing well drilling and service fluid
US6283213B1 (en) 1999-08-12 2001-09-04 Atlantic Richfield Company Tandem spacer fluid system and method for positioning a cement slurry in a wellbore annulus
US6509301B1 (en) 1999-08-26 2003-01-21 Daniel Patrick Vollmer Well treatment fluids and methods for the use thereof
CA2318703A1 (en) 1999-09-16 2001-03-16 Bj Services Company Compositions and methods for cementing using elastic particles
US6214773B1 (en) 1999-09-29 2001-04-10 Halliburton Energy Services, Inc. High temperature, low residue well treating fluids and methods
US6279656B1 (en) * 1999-11-03 2001-08-28 Santrol, Inc. Downhole chemical delivery system for oil and gas wells
US6818594B1 (en) 1999-11-12 2004-11-16 M-I L.L.C. Method for the triggered release of polymer-degrading agents for oil field use
JP4857421B2 (en) 1999-12-08 2012-01-18 独立行政法人産業技術総合研究所 Biodegradable resin composition
US6593279B2 (en) 1999-12-10 2003-07-15 Integrity Industries, Inc. Acid based micro-emulsions
US6578630B2 (en) 1999-12-22 2003-06-17 Weatherford/Lamb, Inc. Apparatus and methods for expanding tubulars in a wellbore
US6311773B1 (en) 2000-01-28 2001-11-06 Halliburton Energy Services, Inc. Resin composition and methods of consolidating particulate solids in wells with or without closure pressure
DE10012063A1 (en) 2000-03-14 2001-09-20 Basf Ag Soft plasticizer-free capsules for use in pharmaceuticals, cosmetics, detergents or plant protectants are made from a polymers obtained by polymerizing a vinyl ester in presence of a polyether substrate
MXPA02009684A (en) 2000-04-05 2003-04-22 Sofitech Nv Viscosity reduction of viscoelastic surfactant based fluids.
US6357527B1 (en) 2000-05-05 2002-03-19 Halliburton Energy Services, Inc. Encapsulated breakers and method for use in treating subterranean formations
US6444316B1 (en) 2000-05-05 2002-09-03 Halliburton Energy Services, Inc. Encapsulated chemicals for use in controlled time release applications and methods
AU2001256356A1 (en) 2000-05-15 2001-11-26 Drochon, Bruno Permeable cements
AU2001260513A1 (en) 2000-06-06 2001-12-17 T R Oil Services Limited Microcapsule well treatment
US6454003B1 (en) 2000-06-14 2002-09-24 Ondeo Nalco Energy Services, L.P. Composition and method for recovering hydrocarbon fluids from a subterranean reservoir
US6394185B1 (en) 2000-07-27 2002-05-28 Vernon George Constien Product and process for coating wellbore screens
US6202751B1 (en) 2000-07-28 2001-03-20 Halliburton Energy Sevices, Inc. Methods and compositions for forming permeable cement sand screens in well bores
US6390195B1 (en) 2000-07-28 2002-05-21 Halliburton Energy Service,S Inc. Methods and compositions for forming permeable cement sand screens in well bores
US6494263B2 (en) 2000-08-01 2002-12-17 Halliburton Energy Services, Inc. Well drilling and servicing fluids and methods of removing filter cake deposited thereby
US6422314B1 (en) 2000-08-01 2002-07-23 Halliburton Energy Services, Inc. Well drilling and servicing fluids and methods of removing filter cake deposited thereby
WO2002012674A1 (en) 2000-08-07 2002-02-14 T R Oil Services Limited Method for delivering chemicals to an oil or gas well
US6432155B1 (en) 2000-08-11 2002-08-13 Cp Kelco U.S., Inc. Compositions containing phosphate and xanthan gum variants
US7052901B2 (en) 2000-10-31 2006-05-30 Baker Hughes Incorporated Bacteria-based and enzyme-based mechanisms and products for viscosity reduction breaking of viscoelastic fluids
CA2432160C (en) 2001-01-09 2010-04-13 Bj Services Company Well treatment fluid compositions and methods for their use
GB2393722A (en) 2001-02-13 2004-04-07 Schlumberger Holdings Cleavable surfactants which may be useful in viscoelastic compositions for oil-field applications
US6544934B2 (en) 2001-02-23 2003-04-08 Halliburton Energy Services, Inc. Methods and compositions for treating subterranean formations with gelled hydrocarbon fluids
US6908888B2 (en) 2001-04-04 2005-06-21 Schlumberger Technology Corporation Viscosity reduction of viscoelastic surfactant based fluids
US6543276B2 (en) 2001-05-18 2003-04-08 Halliburton Energy Services, Inc. Oil well bore hole filter cake breaker fluid test apparatus and method
US7080688B2 (en) 2003-08-14 2006-07-25 Halliburton Energy Services, Inc. Compositions and methods for degrading filter cake
US7168489B2 (en) 2001-06-11 2007-01-30 Halliburton Energy Services, Inc. Orthoester compositions and methods for reducing the viscosified treatment fluids
US7140438B2 (en) 2003-08-14 2006-11-28 Halliburton Energy Services, Inc. Orthoester compositions and methods of use in subterranean applications
US6488091B1 (en) 2001-06-11 2002-12-03 Halliburton Energy Services, Inc. Subterranean formation treating fluid concentrates, treating fluids and methods
US6737473B2 (en) 2001-07-13 2004-05-18 Dow Corning Corporation High solids emulsions of elastomeric polymers
US6828280B2 (en) 2001-08-14 2004-12-07 Schlumberger Technology Corporation Methods for stimulating hydrocarbon production
US6691805B2 (en) 2001-08-27 2004-02-17 Halliburton Energy Services, Inc. Electrically conductive oil-based mud
US6837309B2 (en) 2001-09-11 2005-01-04 Schlumberger Technology Corporation Methods and fluid compositions designed to cause tip screenouts
US7125826B2 (en) 2001-09-14 2006-10-24 Halliburton Energy Services, Inc. Methods of using invertible oil external-water internal fluids in subterranean applications
US6608006B2 (en) 2001-09-14 2003-08-19 Halliburton Energy Services, Inc. Methods of drilling well bores using invertible oil external-water internal drilling fluids
WO2003027431A2 (en) 2001-09-26 2003-04-03 Cooke Claude E Jr Method and materials for hydraulic fracturing of wells
WO2003049701A2 (en) 2001-12-10 2003-06-19 Spherics, Inc. Methods and products useful in the formation and isolation of microparticles
US6861394B2 (en) 2001-12-19 2005-03-01 M-I L.L.C. Internal breaker
AU2003219942A1 (en) 2002-03-01 2003-09-16 Cesi Chemical, A Flotek Company Composition and process for well cleaning
US20080287324A1 (en) 2002-03-01 2008-11-20 Cesi Chemical, Inc., A Flotek Company Process for well cleaning
US6761218B2 (en) 2002-04-01 2004-07-13 Halliburton Energy Services, Inc. Methods and apparatus for improving performance of gravel packing systems
US6852173B2 (en) 2002-04-05 2005-02-08 Boc, Inc. Liquid-assisted cryogenic cleaning
US6691780B2 (en) 2002-04-18 2004-02-17 Halliburton Energy Services, Inc. Tracking of particulate flowback in subterranean wells
US20030230407A1 (en) 2002-06-13 2003-12-18 Vijn Jan Pieter Cementing subterranean zones using cement compositions containing biodegradable dispersants
US6840318B2 (en) 2002-06-20 2005-01-11 Schlumberger Technology Corporation Method for treating subterranean formation
GB0216277D0 (en) 2002-07-12 2002-08-21 Cleansorb Ltd Process for treatment of underground reservoirs
US7049272B2 (en) 2002-07-16 2006-05-23 Santrol, Inc. Downhole chemical delivery system for oil and gas wells
US6978838B2 (en) 2002-07-19 2005-12-27 Schlumberger Technology Corporation Method for removing filter cake from injection wells
US6908887B2 (en) 2002-08-22 2005-06-21 Halliburton Energy Services, Inc. Suspending agent
US7219731B2 (en) 2002-08-26 2007-05-22 Schlumberger Technology Corporation Degradable additive for viscoelastic surfactant based fluid systems
US7066260B2 (en) 2002-08-26 2006-06-27 Schlumberger Technology Corporation Dissolving filter cake
US6886635B2 (en) 2002-08-28 2005-05-03 Tetra Technologies, Inc. Filter cake removal fluid and method
US6959767B2 (en) 2002-09-12 2005-11-01 M-I Llc Remediation treatment of sustained casing pressures (SCP) in wells with top down surface injection of fluids and additives
US6817414B2 (en) 2002-09-20 2004-11-16 M-I Llc Acid coated sand for gravel pack and filter cake clean-up
US6896058B2 (en) 2002-10-22 2005-05-24 Halliburton Energy Services, Inc. Methods of introducing treating fluids into subterranean producing zones
US7265079B2 (en) 2002-10-28 2007-09-04 Schlumberger Technology Corporation Self-destructing filter cake
JP2004181820A (en) 2002-12-04 2004-07-02 Unitika Ltd Biodegradable concrete form
US7147067B2 (en) 2002-12-10 2006-12-12 Halliburton Energy Services, Inc. Zeolite-containing drilling fluids
EP1431368A1 (en) 2002-12-18 2004-06-23 Eliokem Fluid loss reducer for high temperature high pressure water-based mud application
US7419937B2 (en) 2002-12-19 2008-09-02 Schlumberger Technology Corporation Method for providing treatment chemicals in a subterranean well
US20040170836A1 (en) 2003-01-07 2004-09-02 The Procter & Gamble Company Hollow fiber fabrics
US7205264B2 (en) 2003-01-17 2007-04-17 Bj Services Company Well treatment method using fluid containing lactic acid or salt thereof
US6877563B2 (en) 2003-01-21 2005-04-12 Halliburton Energy Services, Inc. Methods of drilling and completing well bores
US6989354B2 (en) 2003-01-24 2006-01-24 Halliburton Energy Services, Inc. Invertible well bore servicing fluid
US6983798B2 (en) 2003-03-05 2006-01-10 Halliburton Energy Services, Inc. Methods and fluid compositions for depositing and removing filter cake in a well bore
US7069994B2 (en) 2003-03-18 2006-07-04 Cooke Jr Claude E Method for hydraulic fracturing with squeeze pressure
US6764981B1 (en) 2003-03-21 2004-07-20 Halliburton Energy Services, Inc. Well treatment fluid and methods with oxidized chitosan-based compound
US7007752B2 (en) 2003-03-21 2006-03-07 Halliburton Energy Services, Inc. Well treatment fluid and methods with oxidized polysaccharide-based polymers
US6981552B2 (en) 2003-03-21 2006-01-03 Halliburton Energy Services, Inc. Well treatment fluid and methods with oxidized polysaccharide-based polymers
BRPI0408455A (en) 2003-03-24 2006-04-04 Basf Ag trifluoromethylthiophenecarboxanilide, use thereof, fungicidal agent, and process to combat harmful fungi
US7114570B2 (en) 2003-04-07 2006-10-03 Halliburton Energy Services, Inc. Methods and compositions for stabilizing unconsolidated subterranean formations
US6987083B2 (en) 2003-04-11 2006-01-17 Halliburton Energy Services, Inc. Xanthan gels in brines and methods of using such xanthan gels in subterranean formations
US6904971B2 (en) 2003-04-24 2005-06-14 Halliburton Energy Services, Inc. Cement compositions with improved corrosion resistance and methods of cementing in subterranean formations
US7098171B2 (en) 2003-05-13 2006-08-29 Halliburton Energy Services, Inc. Synthetic filtration control polymers for wellbore fluids
US20040231845A1 (en) 2003-05-15 2004-11-25 Cooke Claude E. Applications of degradable polymers in wells
US6681856B1 (en) 2003-05-16 2004-01-27 Halliburton Energy Services, Inc. Methods of cementing in subterranean zones penetrated by well bores using biodegradable dispersants
US7228904B2 (en) 2003-06-27 2007-06-12 Halliburton Energy Services, Inc. Compositions and methods for improving fracture conductivity in a subterranean well
US7036587B2 (en) 2003-06-27 2006-05-02 Halliburton Energy Services, Inc. Methods of diverting treating fluids in subterranean zones and degradable diverting materials
US7032663B2 (en) 2003-06-27 2006-04-25 Halliburton Energy Services, Inc. Permeable cement and sand control methods utilizing permeable cement in subterranean well bores
US20050130848A1 (en) 2003-06-27 2005-06-16 Halliburton Energy Services, Inc. Compositions and methods for improving fracture conductivity in a subterranean well
US7178596B2 (en) 2003-06-27 2007-02-20 Halliburton Energy Services, Inc. Methods for improving proppant pack permeability and fracture conductivity in a subterranean well
US7044224B2 (en) 2003-06-27 2006-05-16 Halliburton Energy Services, Inc. Permeable cement and methods of fracturing utilizing permeable cement in subterranean well bores
US7044220B2 (en) 2003-06-27 2006-05-16 Halliburton Energy Services, Inc. Compositions and methods for improving proppant pack permeability and fracture conductivity in a subterranean well
US7066258B2 (en) 2003-07-08 2006-06-27 Halliburton Energy Services, Inc. Reduced-density proppants and methods of using reduced-density proppants to enhance their transport in well bores and fractures
US20050028976A1 (en) 2003-08-05 2005-02-10 Nguyen Philip D. Compositions and methods for controlling the release of chemicals placed on particulates
US6883608B2 (en) 2003-08-06 2005-04-26 Schlumberger Technology Corporation Gravel packing method
US8541051B2 (en) 2003-08-14 2013-09-24 Halliburton Energy Services, Inc. On-the fly coating of acid-releasing degradable material onto a particulate
US7497278B2 (en) 2003-08-14 2009-03-03 Halliburton Energy Services, Inc. Methods of degrading filter cakes in a subterranean formation
US7267466B2 (en) 2003-08-26 2007-09-11 Valeo Sylvania Llc Cargo lamp assembly for vehicles
US7204311B2 (en) 2003-08-27 2007-04-17 Halliburton Energy Services, Inc. Methods for controlling migration of particulates in a subterranean formation
US8076271B2 (en) 2004-06-09 2011-12-13 Halliburton Energy Services, Inc. Aqueous tackifier and methods of controlling particulates
US7131491B2 (en) 2004-06-09 2006-11-07 Halliburton Energy Services, Inc. Aqueous-based tackifier fluids and methods of use
US6997259B2 (en) 2003-09-05 2006-02-14 Halliburton Energy Services, Inc. Methods for forming a permeable and stable mass in a subterranean formation
US7021377B2 (en) 2003-09-11 2006-04-04 Halliburton Energy Services, Inc. Methods of removing filter cake from well producing zones
US7829507B2 (en) 2003-09-17 2010-11-09 Halliburton Energy Services Inc. Subterranean treatment fluids comprising a degradable bridging agent and methods of treating subterranean formations
US20050113259A1 (en) 2003-10-02 2005-05-26 David Ballard Thermal stability agent for maintaining viscosity and fluid loss properties in drilling fluids
US7000701B2 (en) 2003-11-18 2006-02-21 Halliburton Energy Services, Inc. Compositions and methods for weighting a breaker coating for uniform distribution in a particulate pack
US7448450B2 (en) 2003-12-04 2008-11-11 Halliburton Energy Services, Inc. Drilling and cementing with fluids containing zeolite
US7195068B2 (en) 2003-12-15 2007-03-27 Halliburton Energy Services, Inc. Filter cake degradation compositions and methods of use in subterranean operations
US7222672B2 (en) 2004-01-16 2007-05-29 Halliburton Energy Services, Inc. Wellbore fluids containing additives for removing a filter cake and methods of using the same
US7096947B2 (en) 2004-01-27 2006-08-29 Halliburton Energy Services, Inc. Fluid loss control additives for use in fracturing subterranean formations
US7204312B2 (en) 2004-01-30 2007-04-17 Halliburton Energy Services, Inc. Compositions and methods for the delivery of chemical components in subterranean well bores
US7036586B2 (en) 2004-01-30 2006-05-02 Halliburton Energy Services, Inc. Methods of cementing in subterranean formations using crack resistant cement compositions
US7156174B2 (en) 2004-01-30 2007-01-02 Halliburton Energy Services, Inc. Contained micro-particles for use in well bore operations
US20050183741A1 (en) 2004-02-20 2005-08-25 Surjaatmadja Jim B. Methods of cleaning and cutting using jetted fluids
US7063151B2 (en) 2004-03-05 2006-06-20 Halliburton Energy Services, Inc. Methods of preparing and using coated particulates
US7172022B2 (en) 2004-03-17 2007-02-06 Halliburton Energy Services, Inc. Cement compositions containing degradable materials and methods of cementing in subterranean formations
US7093664B2 (en) 2004-03-18 2006-08-22 Halliburton Energy Services, Inc. One-time use composite tool formed of fibers and a biodegradable resin
US7353879B2 (en) 2004-03-18 2008-04-08 Halliburton Energy Services, Inc. Biodegradable downhole tools
GB2412389A (en) 2004-03-27 2005-09-28 Cleansorb Ltd Process for treating underground formations
US7151077B2 (en) 2004-03-29 2006-12-19 Halliburton Energy Services, Inc. Polymersome compositions and associated methods of use
US20050257932A1 (en) 2004-05-19 2005-11-24 Davidson Eric A Filter cake degradation compositions and associated methods
US7595284B2 (en) 2004-06-07 2009-09-29 Crews James B Metal-mediated viscosity reduction of fluids gelled with viscoelastic surfactants
US7475728B2 (en) 2004-07-23 2009-01-13 Halliburton Energy Services, Inc. Treatment fluids and methods of use in subterranean formations
US7165617B2 (en) 2004-07-27 2007-01-23 Halliburton Energy Services, Inc. Viscosified treatment fluids and associated methods of use
US20060032633A1 (en) 2004-08-10 2006-02-16 Nguyen Philip D Methods and compositions for carrier fluids comprising water-absorbent fibers
US7322412B2 (en) 2004-08-30 2008-01-29 Halliburton Energy Services, Inc. Casing shoes and methods of reverse-circulation cementing of casing
US20060046938A1 (en) 2004-09-02 2006-03-02 Harris Philip C Methods and compositions for delinking crosslinked fluids
WO2006029019A2 (en) 2004-09-03 2006-03-16 Baker Hughes Incorporated Method of removing an invert emulsion filter cake after the drilling process using a single phase microemulsion
US7299869B2 (en) 2004-09-03 2007-11-27 Halliburton Energy Services, Inc. Carbon foam particulates and methods of using carbon foam particulates in subterranean applications
US7709421B2 (en) 2004-09-03 2010-05-04 Baker Hughes Incorporated Microemulsions to convert OBM filter cakes to WBM filter cakes having filtration control
US7413017B2 (en) 2004-09-24 2008-08-19 Halliburton Energy Services, Inc. Methods and compositions for inducing tip screenouts in frac-packing operations
US7303014B2 (en) 2004-10-26 2007-12-04 Halliburton Energy Services, Inc. Casing strings and methods of using such strings in subterranean cementing operations
US7093658B2 (en) 2004-10-29 2006-08-22 Halliburton Energy Services, Inc. Foamed treatment fluids, foaming additives, and associated methods
US7553800B2 (en) 2004-11-17 2009-06-30 Halliburton Energy Services, Inc. In-situ filter cake degradation compositions and methods of use in subterranean formations
US7648946B2 (en) 2004-11-17 2010-01-19 Halliburton Energy Services, Inc. Methods of degrading filter cakes in subterranean formations
US7748451B2 (en) 2004-12-08 2010-07-06 Halliburton Energy Services, Inc. Methods for improving low-quality proppant and method of using low-quality proppant in subterranean operations
US7514390B2 (en) 2004-12-28 2009-04-07 Conocophillips Company Method for removing filter cake from a horizontal wellbore using acid foam
US20060169182A1 (en) 2005-01-28 2006-08-03 Halliburton Energy Services, Inc. Methods and compositions relating to the hydrolysis of water-hydrolysable materials
US8030249B2 (en) 2005-01-28 2011-10-04 Halliburton Energy Services, Inc. Methods and compositions relating to the hydrolysis of water-hydrolysable materials
US7267170B2 (en) 2005-01-31 2007-09-11 Halliburton Energy Services, Inc. Self-degrading fibers and associated methods of use and manufacture
US20080009423A1 (en) 2005-01-31 2008-01-10 Halliburton Energy Services, Inc. Self-degrading fibers and associated methods of use and manufacture
US20060172894A1 (en) 2005-02-02 2006-08-03 Halliburton Energy Services, Inc. Degradable particulate generation and associated methods
US20070298977A1 (en) 2005-02-02 2007-12-27 Halliburton Energy Services, Inc. Degradable particulate generation and associated methods
US20060172895A1 (en) 2005-02-02 2006-08-03 Halliburton Energy Services, Inc. Degradable particulate generation and associated methods
US20060169450A1 (en) 2005-02-02 2006-08-03 Halliburton Energy Services, Inc. Degradable particulate generation and associated methods
US20060183646A1 (en) 2005-02-15 2006-08-17 Halliburton Energy Services, Inc. Viscoelastic surfactant fluids and associated methods
US7299874B2 (en) 2005-02-15 2007-11-27 Halliburton Energy Services, Inc. Viscoelastic surfactant fluids and associated methods
US7303019B2 (en) 2005-02-15 2007-12-04 Halliburton Energy Services, Inc. Viscoelastic surfactant fluids and associated diverting methods
US7159659B2 (en) 2005-02-15 2007-01-09 Halliburton Energy Services, Inc. Viscoelastic surfactant fluids and associated acidizing methods
US7216705B2 (en) 2005-02-22 2007-05-15 Halliburton Energy Services, Inc. Methods of placing treatment chemicals
US7506689B2 (en) 2005-02-22 2009-03-24 Halliburton Energy Services, Inc. Fracturing fluids comprising degradable diverting agents and methods of use in subterranean formations
US7328746B2 (en) 2005-03-01 2008-02-12 Saudi Arabian Oil Company Method and composition for forming protective precipitate on cement surfaces prior to formation acidizing treatment
GB0507507D0 (en) 2005-04-14 2005-05-18 Surfactant Technologies Ltd A surfactant system
US7608567B2 (en) 2005-05-12 2009-10-27 Halliburton Energy Services, Inc. Degradable surfactants and methods for use
US7662753B2 (en) 2005-05-12 2010-02-16 Halliburton Energy Services, Inc. Degradable surfactants and methods for use
US20060276345A1 (en) 2005-06-07 2006-12-07 Halliburton Energy Servicers, Inc. Methods controlling the degradation rate of hydrolytically degradable materials
US7431088B2 (en) 2006-01-20 2008-10-07 Halliburton Energy Services, Inc. Methods of controlled acidization in a wellbore
US7455112B2 (en) 2006-09-29 2008-11-25 Halliburton Energy Services, Inc. Methods and compositions relating to the control of the rates of acid-generating compounds in acidizing operations
CA2662933C (en) 2006-10-11 2013-03-12 Baker Hughes Incorporated In situ fluid formation for cleaning oil-or synthetic-oil-based mud
US8220548B2 (en) 2007-01-12 2012-07-17 Halliburton Energy Services Inc. Surfactant wash treatment fluids and associated methods
US20080169103A1 (en) 2007-01-12 2008-07-17 Carbajal David L Surfactant Wash Treatment Fluids and Associated Methods

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10550319B2 (en) 2013-04-05 2020-02-04 Halliburton Energy Services, Inc. Wellbore servicing compositions and methods of making and using same
CN109651869A (en) * 2018-11-30 2019-04-19 柏晨化工科技张家港保税区有限公司 A kind of plastic cement paint stripper and preparation method thereof

Also Published As

Publication number Publication date
CA2723856A1 (en) 2009-11-19
EG26739A (en) 2014-07-14
EA026273B1 (en) 2017-03-31
CO6351804A2 (en) 2011-12-20
ECSP10010658A (en) 2011-03-31
AU2009247832A1 (en) 2009-11-19
EA201071295A1 (en) 2011-06-30
US7906464B2 (en) 2011-03-15
EP2300557A1 (en) 2011-03-30
US20090286701A1 (en) 2009-11-19
MY151226A (en) 2014-04-30
AU2009247832B9 (en) 2014-07-31
MX2010012403A (en) 2010-12-02
BRPI0912765A2 (en) 2015-10-13
WO2009138733A1 (en) 2009-11-19
AU2009247832B2 (en) 2014-07-03

Similar Documents

Publication Publication Date Title
CA2723856C (en) Compositions and methods for the removal of oil-based filtercakes
AU2013335191B2 (en) Wellbore servicing compositions and methods of making and using same
CA2692531C (en) Method for treatment of underground reservoirs
CA2833522C (en) Environmentally friendly low temperature breaker systems and related methods
CA2705597C (en) Methods and compositions for acidization in a wellbore using an ester or polyester of a glycerol
CA2453648C (en) Methods of drilling and completing well bores
AU2017286720B2 (en) Compositions and methods for preparation and utilization of acid-generating materials
US11661544B1 (en) Filter cake removal compositions and methods of making and using same
US20230151262A1 (en) Filter Cake Removal Compositions and Methods of Making and Using Same
US20230167352A1 (en) Filter Cake Removal Compositions and Methods of Making and Using Same

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20220301

MKLA Lapsed

Effective date: 20200831