CA2611769A1 - Degradable fiber systems for stimulation - Google Patents

Degradable fiber systems for stimulation Download PDF

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Publication number
CA2611769A1
CA2611769A1 CA002611769A CA2611769A CA2611769A1 CA 2611769 A1 CA2611769 A1 CA 2611769A1 CA 002611769 A CA002611769 A CA 002611769A CA 2611769 A CA2611769 A CA 2611769A CA 2611769 A1 CA2611769 A1 CA 2611769A1
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CA
Canada
Prior art keywords
fibers
acid
carrier fluid
ppt
proppant
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.)
Granted
Application number
CA002611769A
Other languages
French (fr)
Other versions
CA2611769C (en
Inventor
Dean M. Willberg
Christopher N. Fredd
Marina Bulova
Ann M.W. Hoefer
Philip F. Sullivan
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Schlumberger Canada Ltd
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Individual
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Filing date
Publication date
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Publication of CA2611769A1 publication Critical patent/CA2611769A1/en
Application granted granted Critical
Publication of CA2611769C publication Critical patent/CA2611769C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • C09K8/66—Compositions based on water or polar solvents
    • C09K8/68—Compositions based on water or polar solvents containing organic compounds
    • 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
    • C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
    • 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
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/08—Fiber-containing well treatment fluids
    • 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
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/30—Viscoelastic surfactants [VES]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S507/00—Earth boring, well treating, and oil field chemistry
    • Y10S507/922—Fracture fluid
    • Y10S507/924—Fracture fluid with specified propping feature

Abstract

A method for minimizing the amount of metal crosslinked viscosifier necessar y for treating a wellbore with proppant or gravel is given. The method include s using fibers to aid in transporting, suspending and placing proppant or grav el in viscous carrier fluids otherwise having insufficient viscosity to prevent particulate settling. Fibers are given that have properties optimized for proppant transport but degrade after the treatment into degradation products that do not precipitate in the presence of ions in the water such as calcium and magnesium. Crosslinked polymer carrier fluids are identified that are no t damaged by contaminants present in the fibers or by degradation products released by premature degradation of the fibers.

Claims (10)

1. A method of treating a wellbore and a formation penetrated by the wellbore comprising a step of injecting a slurry of fibers and proppant in a viscous carrier fluid above the fracture pressure of the formation, wherein the viscosity of the carrier fluid in the absence of fibers is insufficient to prevent proppant settling during transport, further wherein the fibers degrade after the treatment into products that do not precipitate in the presence of calcium or magnesium ions and further wherein the fibers are selected from the group consisting of substituted and unsubstituted lactide, glycolide, polylactic acid, polyglycolic acid, copolymers of polylactic acid and polyglycolic acid, copolymers of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, copolymers of lactic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and mixtures thereof.
2. The method of claim 1 wherein the fibers have a length of about 2 to about mm.
3. The method any of claim I or claim 2 wherein the fibers have a denier of about 0.1 to about 20.
4. The method of any of the preceding claims wherein the fibers degrade at formation temperature in a time between about 4 hours and 100 days.
5. The method of any of the preceding claims wherein the carrier fluid comprises a borate crosslinked polymer, and wherein the polymer concentration is between about 1.92 g/L (about 16 ppt) and about 3.6 g/L (about 30 ppt).
6. The method of any of claim 1 to claim 4 wherein the carrier fluid comprises a polymer crosslinked with a zirconate, and further wherein the polymer concentration is between about 2.64 g/L (about 22 ppt) to about 3.6 g/L (about 30 ppt).
7. The method of any of claim 1 to claim 4 wherein the carrier fluid comprises a viscoelastic surfactant.
8. The method of any of the preceding claims wherein the carrier fluid comprises a pH control agent present in an amount sufficient to neutralize any acid present in the fibers before the injection and to neutralize any acid generated by the fibers before the fracture closes.
9. The method of claim 8 wherein the pH control agent is selected from the group consisting of amines and alkaline earth, ammonium and alkali metal salts of sesquicarbonates, carbonates, oxalates, hydroxides, oxides, bicarbonates, and organic carboxylates.
10. The method of any of the preceding claims wherein the fiber comprises polylactic acid.
CA2611769A 2005-06-20 2006-06-19 Degradable fiber systems for stimulation Active CA2611769C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/156,966 US7275596B2 (en) 2005-06-20 2005-06-20 Method of using degradable fiber systems for stimulation
US11/156,966 2005-06-20
PCT/IB2006/051966 WO2006137002A1 (en) 2005-06-20 2006-06-19 Degradable fiber systems for stimulation

Publications (2)

Publication Number Publication Date
CA2611769A1 true CA2611769A1 (en) 2006-12-28
CA2611769C CA2611769C (en) 2011-07-19

Family

ID=37185708

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2611769A Active CA2611769C (en) 2005-06-20 2006-06-19 Degradable fiber systems for stimulation

Country Status (7)

Country Link
US (5) US7275596B2 (en)
CN (1) CN101273183B (en)
AR (1) AR055338A1 (en)
CA (1) CA2611769C (en)
EA (1) EA009171B1 (en)
MX (2) MX2007015539A (en)
WO (1) WO2006137002A1 (en)

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