CA2663358C - Methods and apparatus for reverse circulation cementing of casing strings in wellbores - Google Patents
Methods and apparatus for reverse circulation cementing of casing strings in wellbores Download PDFInfo
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- CA2663358C CA2663358C CA2663358A CA2663358A CA2663358C CA 2663358 C CA2663358 C CA 2663358C CA 2663358 A CA2663358 A CA 2663358A CA 2663358 A CA2663358 A CA 2663358A CA 2663358 C CA2663358 C CA 2663358C
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- casing
- isolation device
- outer annulus
- well bore
- casing hanger
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Methods and devices for completion of well bores and more particularly, to reverse circulation cementing of casing strings in well bores are provided. One example of a method may comprise a method for providing fiuidic access to an outer annulus of a casing string within a well bore. One example of a device may comprise a casing hanger (110), the casing hanger comprising a fluid port (120) wherein the fluid port provides fiuidic access to an outer annulus (150) by allowing fluid to pass through the casing hanger; a landing sub (130) attached to the casing hanger; and an isolation device (140) attached to the landing sub wherein the isolation device is adapted to allow fiuidic isolation of a portionof the landing sub from a portion of the outer annulus of the well bore.
Description
METHODS AND APPARATUS FOR REVERSE CIRCULATION
CEMENTING OF CASING STRINGS IN WELLBORES
I3ACKGROLrND
[0001] The present invention relates to methods and devices for completion of well bores and more particularly, toreverse circulation cementing of casino strings in well bores.
CEMENTING OF CASING STRINGS IN WELLBORES
I3ACKGROLrND
[0001] The present invention relates to methods and devices for completion of well bores and more particularly, toreverse circulation cementing of casino strings in well bores.
[0002] Conventional methods for completion of well bores typically involve cementing a casing string or multiple casin- strings in a. well bore. Cementing of a casing strin- is often aecomplished by pumpincy a cement slurrv down the inside of a tubing, a casink-3, and then back up the annular space around the casing. In this way, a cement sliui-y may be introduced into the annula.r space of the casinb (e.a. the annular space between the casing to be cemented and the open hole or outer casing to which the casing is to be cemented).
[0003] Cementing in this fashion has several drawbacks. In particular, hi-h pressures are required to "lifi" the cement up into the annular space around the casing_ Thes:c high deliv rrr pressures may, in some cases, cause formation dama~;e. Likewise, high delivery pressures can cause the undesirable effect of inadvertentl;r "i7oatinU" the casing string.
That is, exposing the bottom hole of the well bore to hisih delivery pressures can, in some cases, cause the casinu string to "float" upward.
[0003] Cementing in this fashion has several drawbacks. In particular, hi-h pressures are required to "lifi" the cement up into the annular space around the casing_ Thes:c high deliv rrr pressures may, in some cases, cause formation dama~;e. Likewise, high delivery pressures can cause the undesirable effect of inadvertentl;r "i7oatinU" the casing string.
That is, exposing the bottom hole of the well bore to hisih delivery pressures can, in some cases, cause the casinu string to "float" upward.
[0004] Another method of cementinv casing, sonietimes referred to as reverse circulation cententirig, involves introducing the cement slurry directly from the surface into the annular space rather than introducing the cement slurn~ doum the casing strincg itself. In particula_r, reverse circulation cementing avoids the higher pressures necessary to lift the cen-ient slurry up the annulus. Other disadvantaaes of having to pump the cement slurry all the wa-y down the casinc, strin- and then up the annulus are that it requires a much longer duration of time than reverse circulation cementing. "I'his i.ncreased job time is disadvantageous because of tlie additional costs associated xA-ith a longer duration cementino joh_ Moreover, the additional time required often necessitates a longer set delay time, which may require additional set retarders or other chemicals to be added to the cement slurry.
[0005j Further, pumping a cement slum~ all the way to the bottom hole of the well liore.
exposes the cement slumi to higher temperatures than would otherwise be necessary- had the cement slurrv been introduced directly from the suiface to the annulus to be cemented. This exposure to higher temperatures at the bottom hole is undesirable, in parl, because the hi~her ternpe;ratures nlav cause the cement to set prematurely or may cause the operator to modify the cement composition to be able to withstand the higher temperatures, tiA~hici~
may result in a less desirable final cementing completion.
[0006] Thus, reverse circulation cementing has man), advanta-gges ovcr conventional cemer.tinb. 1Vevertheless, reverse circulation cementin,v, involves other challenues such as fluidic access to the am-lulus. UnfortLinately, conventional methods for isolating the casing annulus either do not permit reverse circulation cementing or often involve complex andr'or expensive equipment. In some cases, the equipnient used for isoiatinD the casing annulus for a reverse:
circulation cementinc, requires that the drillinu ri~~ remain at the well location for the duration of the cementing job. Requiring the driiling rig to stay at the well during a cementing operations is problematic in pa.rt because the drilling rig may not be used to drill subsequent wells during the cementing job and the cost of keeping the drillino rig on locatiun is often quite high.
SUMMARY
[0007] The present inventio.n relates to me-thods and devices for completion of well bores and more particularly, to reverse circulation cementing of casing strings in well bores.
[000$] ln one embodiment, the present invention provide, amethod for providing fluidic access to an outer annulus of a casing string within a well bore comprising providing an apparatus conrprising a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casinc) hanyer, a landing sub attached to the casing hanger, and an isolatiori device attached to the Iandng sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landina sub; Ianding the apparatus at the well bore -vvherein the isolation device provides fluidic isolation of' a portion of an outer a_nnulus of the well bore; providing a cement slurry; introducing the cement slurry into the outer annulus of the well bore via the f_Iuid port;
and allowing the cement slurry to set up in the outer annulus of the weil bore.
[0009j In another embodiment, the present invention provides ar_ apparatus for providinia fluidic access to an outer annulu`q of a casing string within ax7v~ell bore comprising a casing hanuer, the casing hanger cosnprising a fiuid port wherein the fluid port provides fluidic access to an outer annulus by allowrinD fluid to pass throueh the casing hanger; a landing sub attached to the casina hanaer; and an isolation device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub from a poriion of the outer annulus of the well bore.
[0010] In other embodiments, the present invention provides a reverse circulation cernentine, systeni coinprisrng a casing string disposed within a well bore, the well bore havlnV
an outer annulus forned by t.he casing string being disposed within the well bore; a casinQ
hanger disposed about a lon,itudinal portion of the casing string, the casing hanger comprising a fluid port ,~vherein the iluid port provides fuidic access to an outer annulus by a1loxing fluid to pass through the casing hanger; a landing sub atiached to the casing han-er;
ai}d an isolation device attached to the landing sub tvherein the isolation device adapted to allowfluidic isolation.
of a portion of the Ianding su.b from a portion of the outer. annulus of the well bore.
[0011] The features and advantages of the present invention 1~'i3l be apparent to those skilled in the art. While numerous changes may be made by those skilled in the art, such changes are within the spirii of the invention.
ERIIEF DESCRIPTION OF THE DP.ANVINGS
[00]2] These drawings illustrate certain aspects of some of the einbodimen.ts of the present invention, and should noi be used to limit or define the invention.
[0013] Figure 1 illustrates a cross-seetional view of an apparatus for providing fluidic access tc the outer annulus of a casin2 string in a well bore in accordance ti6th one embodi--nent of the present invention.
100141 Fig-ure 2A illustrates a cross-sectional view of a portion of ;ui apparatus for providina fluidic access to an outer annulus of a casing string showing a hardenina tluid being used to provide fluidic isolation of a portion of a landing sub from the outer annulus of the casing string in accordance Nvith one embodirnent of the present invention.
[0015] Figure 2B illustrates a cross-sectional view of a well bore after removal of a portion of the apparatus of Figure 2A in accordance with one embodiment of the pre,sent invention.
[0016] Figure 2C iilustrates a cross-sectional view of well bore after removal of the apparatus of Figures 2A and 2B in accordance with one embodiment of the present invention.:
[0017.1 Figure 3, lllustrates a Cr{Jss-s?Ctlonal view of an, isolation device of an apparatus for providinff fluidic access to an outer annulus of a casing string, interactinc, with its environment in accordance with one ernbodiment of the present invention.
[0018] Figure 4 illustrates a cross-sectional view of an isolation device interacting a"ith ]ts environnlent in accordance with one embodiment of the present invention.
[0019] Figure 5A illustrates a cross-sectional view of aal apparatus for providing fluidic access tc an outer annulus of a casin-, string, the apparatus containing a slip shoum in its instalIed posiiion.
[0020] Figure 5B illustrates a detailed vie~N, of the slip arrangement of the apparatus of Figure 5A, for providinQ fluidic access to an outer annulus of a casing strring.
[0021] Figure 5C illustrates a cross-sectional view, of the apparatus of Figure 5A aher enr=a,ement of the slip with a subsurface casinb strin-.
[0.022] Figure 5D illustrates a detailed view of the slip arrangement of the apparatus of Fiaure 15C, after engaQement of the mecharrical slip with a subsurface casing strin<.,r.
[0023] Figure 5E illustrates a cross-sectional view of the apparatus of FiETure 3C.show>ing tlte mechanical slip in the process of being returned to its original installed position.
[0024] Figure 5F illustrates a detailed view of the slip arranLAment of the apparatus of Fiaure 5E showing the mechanical slip iri the process of being returned to its original installed position.
[0025] Figure 5G illustrates a cross-sectional view of the apparatus of Figure 5E showing the mechanical slip in the process of being returned to its original installed position, after shearing of a pin connecting an inner ring and a wedge.
[0026] Figure 6H illustrat.es. a detailed view of the slip arranaement of the apparatus of Finure SG showing the mechanical slip in the process of being, returned to its original installed position, after shearing of a pin connecting an inner ring and a wedge_ rU027] Figure 51 illustrates a cross-sectional vielaJ of the apparatus of Figuxe 5Ci with the mechanical slip full}r disengaged from a subsurface casing strincl.
[0028] Figure 5J illustrates a detailed view of the slip arrangement of -51 after the mechanical slip is full}T disengaged from a subsurface casing string. -I:}E T AIf1EU DESCRIPTION
[0029 j The present invention relates to methods and devices for completion of ZveIl bores and more particularly, to reverse circulation cementing of casing strings in well bores.
[0030] Tlle methods and devices of the present invention may allow for an improved reverse circulation cementing of the ain-iular space of a casing to be cemented. In particular, the xeverse circulation cementing devices and methods of the present invention may provide an improved fluidic isolation of a well bore outer annulus for cernenting casing in well bores_ in certain embodiments, a device of the present invention may comprise a casing han-er, the casing hani~er comprisincy a fl uid port wherein the fluid port provides f7uidic access to an outer annulus by allowing fluid to pass throuab the casin-, hanger; a landing sub attached to the casinc, hanger;
and an isolation device attached to the landing sub wherein the isalation device is adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.
[003 1] To facilitate a better understanding of the present invention, the followinir examples of certain embodirients are given. In no way should the following examples be read to limit, or define, die scope of the invention.
[0032] Figure I illustrates a;;ross-sectior,al viezv of reverse circulation cementing a.ppa3:atus 100 ini.eractiirg Krith casing string 105 in a well bore in accordance with one embodiment of the present invention. Casing hanger I 10 may be attached to landing sub 130 by collar 115 or any attachment means knti-wn in the art. Although landing sub 130 is depicted as a separate piece. from casing banger 110, landin~ sub 130 may be integral to casing hanaer. 110 in certain embodiments. Landing sub 130 may seat against ground 12>, or any other support structure near the (yround, to provide support for reverse circulation cementing apparatus 100.
Casing hanger 110 may comprise a fluid port 1?0. Fluid port 120 may be used, among other things, to introduce cement slurry compositions to outer annulus 1-50 by way of f.luid conduit 123. . In certain embodiments, fluid port 120 may be integral to casing haai-er 110. Isolation device 140 may provide fluidic isolation of outer annulus 150. In this way, fluid introduced into outer annulus 150 is prevented from exiting outer annulus 150 by leakage around landinb sub 130. Ilotvever, the fluid insertion tube 145 may be any means for insertin~
.f.luid.
[0033] Isolation device 140 may be any device that provides at least partial tluidic .solation of outer annulus 130. In certain embodiments, isolation device 140 maV comprise a rubber cup, a cement basket, or a retrievable packer. In the embodiment depicted in Figure 1, isolation device 140 is shovNm as an inflatable tube. The inflatable tube may be expanded or inflated with a fluid. In certain embodiments, the fluid ma)- be a hardening fluid, which may be a settable fluid capable of permanently hardening in a portion of outer annulus 150. Fluid insertion tube 145 may be used to introduce a fluid into isolation device 140 as necessary. In certain embodiments, fluid insertion tube 145 may be a hose.
[0034] Sealing mandrel 160 may be attached to casing hanger 110 by any means known in the art. In certain embodiments, sealing mandrel 160 may be integrat to casing hanger I 10. In the embodiment depicted in Figure 1, sealing mandrel 160 is shotivn as attached to casing hanger 110 via load bearing ring 170. Load bearing ring 170 is in turn attached to turnbuekles 163 and 165 via bolt 167. Sealing mandrel 160 may also be attached to casing string 105 via casing collars l72 and 174. In this way, sealing mandrel 160 mav support the weight of casing string 105.
L00351 Conversely, sealina mandrel 160 may be removed from reverse circulation cementing apparatus 100 by removing bolt 167 from tu.rnbucl_-?es 163) and 165 thus allowing for the release of sealing mandrel 160 from casing hanger 110.
[00361 Handling sub 180 may optionally be attached to sealing rian.drel 160.
Handling sub 180 allows for external handling equipment to attach to and manipulate as necessary reverse circulation cementing apparatus 100. Likewise, landing eye 135 also allows for =external nandling equipment to attach to and manipulate as necessary reverse circulation cenlenting apparatus 100. In this way, casing hanger 110 in conJunction with sealing mandrel 160 may support the weijht of casing string 105_ L003711 Figures 2A-2C illustrate a cross-sectional view of a portion of a reverse circulation cementing appararus showing a hardening fluid being used to provide t~uidic isolation of a portion of a landing sub from the outer annulzzs of the casing string. in accordance with one embodiment of the present invention.
[0038] Fluid insertion tube 245 may be used to introduce a hardenin(y fluid, for example, cement, into isolaaion device 240, depicted here as an expandable tube. By sealing off the top portion of outer annulus 250, isolation device 340 provides fuidic isolation of outer annulus 250.
[0039] As in Figure 1, Figure 2A shows casing hanger 210 attached to landina sub 2?0 via collar 215. Casing collar 21 -5 niay be removed to allow casing hanger 210 to detach (as illustrat.ed in Fiaure 2B).
[0040] Figure 2B illustrates a cross-sectional view of ivell bore after removal of a portion of the reverse circulation cementing apparatus of Figure 2A in accordance wi-Cr, one embodiment of the present inventio.n.
[0041] In Figure 2B, landing sub 230 is shoNvn after detachment of.casing hanL7er 210. In certain cmbodiments, landing sub 230 may be left at the well site permanently.
ln still other embodimenis, landino sub 230 may be removed. In such a removal; pin 233 may be removed to allow detachment of landinc, sub 230.
[0042] Figure 2C illustrates a cross-sectional view of well bore after removal of a portion of the reverse circulation cementing apparatus of Figures 2A and 2B in accordance with one embodiment of the present invention. In particular, Figure 2C shows the remaining portion of the reverse circulation cementing apparatus after removal of landing sub 2 30.
Casing string 205 remains in piace in the well bore after removal of Ianding sub 230. Remaining outer annular sleeve 23 7 may be severed at around level or left in place as desired.
[0043] Figure 3 illustrates a cross-sectional view of an isolation device of a reverse circulation cementing apparatus :nteract:ng ~v2th its environment in accordance with one embodiment of the present invention. In particular, isolation deviLe 340, represented schematically, may be any device suitable for providing fluidic isolation to the outer annulus.
Suitable examples include cement basket isolation devices or a rubber cup isolation devices. In either case, isolation device 3'10 prqvides fluidic isolation of outer a.nnulus 350. Fluid insetiron port 347 may be used to introduce a hardenable fluid to provide additional fluidic isolation optionally as desired. ln certain embodiments, such as when a hardenable fluid is used, the reverse circulation cementing apparatus may be permanently affixed to the vvell head.
[i}044] Figure 4 illustrates a cross-sectional view of a retrievable cup or inflatable packer interacting with its environment in accordance. with one embodiment of the present invention.
Isolation device 440, depicted as a retrievable cup in this embodiment, may provile fluidic isolation of outer annulus 450. Certain eribodiments of the reverse circulation.ccmenting apparatus may forego the use of a hardenable fluid such as -%vhen a retrievable cup is used.
[0045] Figures 5A and 5B illustrate a cross-sectional view of siip apparatus 500 to prevent the "floatinb" of the casing string on top of the cement slurry, the apparatus having mechanical slip 560 for preventing "floating" of the casing string 505. In Figures SA and 5B, slip apparatus 500 is shown in its original installed position. Figures 5C and 5D illustrate mechanical slip 560 of apparatus 500 being engaged to subsurface casing string 555. Successive Figures 5E-5J illustrate the subsequent disengagement of apparatus 500 to return rnech.anical slip 560 to its original installed position.
[0046] Figure 5A illustrates an overview of slip apparatus 500 inieracting w-ith subsurface casing string 555 cemented into a well bore. Figure 6I3 illustrates a detailed view of mechanical slip 560 of apparatus 500. Loolcing initiaily at Figure 5A, an overview of apparatus 500 is shown in its original installed position. As in Figure 1, FiQure aA
shows casing hanger 10 attached to landing sub 530 via collar 515. The portion of apparatus 500 positioned above collar 5 15 (not illustrated) is as described in Figure 1. In the embodiment depicted in Figure 5A, an actuating mandrel 520 is in communication with ports 521 and 522. Actuating ma,ndrel 520 may translate dovrnward in response to a pressure applied to port. 521.
Actuating manclrel 520 may translate upwar d=;r, response ic a pressure applied to port 522.
[0047] Isolation device 540, depicted as a retrievable cup in this en-ibodiment, may be in engagement with subsurface casing string 555, which in ti~us en, bodlment, is cemented into place within the well bore. By engaging subsurface casing string 555, isolation device 540 provides fluidic isolation of outer annulus 550.
[0048] In this embodiment, casing string 505 connected by collar 576 may be positioned internal to subsurface casing string 555. Positioned above isoiation device .540 is illustrated mechanical slip 560, in accordance witii one embodiment of the present invention, which is depicted in Figure 5B in an enlarged view.
[0049] Turning to Figure 5B, in more detail, in this embodiment, mechanical slip 560 is in its original installed position. Mechanical slip 560 is disengaged frona the subsurface casing string 555 and is positioned on an inclined surface of wedge 565. Mdge 565 is attached by a shear pin 567 to inner ring 5570. Wedge 56> may have fin;ers (not illustrated) ~vhich are grooves internal to wedge 565 that are compressed as a result of contact with inner ring 570. Flexible member 572 is attached to mechanical siip 560 to aid in the retention of mechanical slip 560 in the disengaged position. In certain embodiments, flexible mernber 572 may be a spring.
Flexible member 572 is further attached to retaining ring 574. Any suitable means lcnovvn in the art may be used to attach flexible member 572 to retaining ring- 574 and mechanical slip 560, in this embodiment, retaining ring 574 is coupled to actuatin4 mandrel 520 b3-. a shear pin 576. AUy suitable means knoi-vn in the art may be used to attach actuating mandrel 520 to retaininU rin, 574. Positioned on the lower portion of actuating mandrel 520 is a snap ring 580, which in this initial position, is engaged vvith inner ring 570.
[0050] Figures 5C and 5D illustrate the mechanical slip 560 of Figures 5A and enga-ed tij-ith a subsurface casing 555. Figure 5C shows an oven-iew view of mechanical slip 560 engaged Arith the subsurface casing string 555. In this position, mechanical slip 560 may prevent casing string 505 from "floating" during reverse cementing operations.
In the embodiment illustrated in Figure 5C, pressure has been applied to the actuating mandrel -520 via port 5221. 117he amount of pressure applied to the mandrel is sufficient to allow the mechanical slip 560 to enaage the subsurface c~asing string 555. In certain embodi.ments, the pressure applied ma_y be pressure resulting from injection of fluid into the port 52 1.
As shown in Fi2ure 5C, the pressure applied ro actuating mandrel -;20 forces mandrel 520 do~-vnulard, further into the Nvell bore. The shear pin 5716 coupling retaining ring 5 74 and actuating mandrel 520 is sheared., as shown in fii-mure 5D. As actuating mandrel 520 compresses retainina ring 574. mechatiical slip 560 is forced down the inclined surface of wedge 565 and er_gages the subsurface casing strino 555. Flexible member 57-2 is pulled into tension as mechanical slip 560 engages the subsurface ca4in{= string 555. Snap ring 580 is disengatred from inner ring 570, as a result of the change in position of the mandrel 520. Mechanical slip 560 is now engaged with subsurface casing string 555 and a reverse cementing job may be performed without "floating" the casing string 50>. Although mechanical slip 560 is depicted engaged with subsurface casing string 505, mechanical slip 560 may be adapted for use in an open hole without subsurface casing in certain embodiments.
[005 ] Figures 5E and SF illustrate th::- apparatus 500 of Figures 5C and 5D
in the process of d'zsenQa~,=ement of mechanical slip 560 f,:om subsurface casing 555. The disLngagement of mechanical slip 560 may occur subsequcnt to a reverse circulation cementing job. In this embodiment illustrated in Figure SE, to beain the process of dis::ngagement of inechanical slip 560 from the subsurfa.ce casing 555, pressure is applied at port 522 to actuatinU
mandrel 5'210. As pressLtre is applied to actuatina mandrei 520, actuatin(y rnandrel 520 moves upward in response such that snap ring 580 ennages inner ring 570, as illustrated iri I=igure. SF.
[0052] FiQures 5G and 5I3 shov.=s the apparatus 500 as it continues the process of disen~agement of mechanical sIip 560 from subsurface casing 555. As pressure is continued to be applied to actuating n:andrel 520 through port 522, snap ring 580 is forced further upward a`rainst the lower surface of inner rint, 570, as shown in Figure 5H. The force is sufficient such that sh.ear pin 567 connecting inner ring 570 and wedge 565 is sheared, thereby releasing inner ring 570 from wed2e 565. As actuatina mandrei 520 continues to move upward, snap ring 580 and inner ring 570 are forced upward until inner ring 570 contacts the upper portion of mechanical slip 560 and be-ins to pull mechanical slip 560 a-Nvay from the subsurface casing strinL~, 555. With the removal of inner ring.570 from its initial position, the fmgers of wedaL. 565 fle,, away from mechanical slip 560, tivhich aid in disengaging mechanical slip 560 from subsurface casin- strinQ 5~5.
[0053 ] The continued pressure applied via port 522 to actuating mandrel 520, illustrated in Fl-Ilire j1, results in Conlplete dlsengagement of mechan3Cal sllp 560 -fxon2 3llbs'lrface Casing, string 555. Snap ring 580 and iriner ring 570, continue to pt:li mechanical slip 560 until can-iplete disenaaoernent of inechanical slip 560 from subsurface casing strinfy 555 is achieved, iliustrat¾d in Figiire 5?. Fiexible mPmb:;r 572 returns to its initial relaxed position, thereby further aiding the disenaaLTenlent of mechanical slip 560 from subsurface casinG strinc-, 555.
[00 54] "fherefore, the present invention is well adapted to attain the ends and advantaaes mentioned as well as those that are inherent th.erein. The particular embodiments disclosed above are illustrative only, as the present invention may be modified and practiced i_n difiLrent but equi~raien*: manners apparent to those sl:illed in the art haz~ing the beneft of the teach.inf~s herein. Furthermore, no limitations are intended to the details of construction or desigr~ herein shown, other than as described in the claims below. It is therefore evident that the particular illustrative embodiments disclosed above may be altered or modified and all such variations are considered ~7,ith.in the scope and spirit of the present invention. Also, the terms in the claims have their plain, ordinary meanina unless otherwise explicitly and clearly defined by the patentee.
[0005j Further, pumping a cement slum~ all the way to the bottom hole of the well liore.
exposes the cement slumi to higher temperatures than would otherwise be necessary- had the cement slurrv been introduced directly from the suiface to the annulus to be cemented. This exposure to higher temperatures at the bottom hole is undesirable, in parl, because the hi~her ternpe;ratures nlav cause the cement to set prematurely or may cause the operator to modify the cement composition to be able to withstand the higher temperatures, tiA~hici~
may result in a less desirable final cementing completion.
[0006] Thus, reverse circulation cementing has man), advanta-gges ovcr conventional cemer.tinb. 1Vevertheless, reverse circulation cementin,v, involves other challenues such as fluidic access to the am-lulus. UnfortLinately, conventional methods for isolating the casing annulus either do not permit reverse circulation cementing or often involve complex andr'or expensive equipment. In some cases, the equipnient used for isoiatinD the casing annulus for a reverse:
circulation cementinc, requires that the drillinu ri~~ remain at the well location for the duration of the cementing job. Requiring the driiling rig to stay at the well during a cementing operations is problematic in pa.rt because the drilling rig may not be used to drill subsequent wells during the cementing job and the cost of keeping the drillino rig on locatiun is often quite high.
SUMMARY
[0007] The present inventio.n relates to me-thods and devices for completion of well bores and more particularly, to reverse circulation cementing of casing strings in well bores.
[000$] ln one embodiment, the present invention provide, amethod for providing fluidic access to an outer annulus of a casing string within a well bore comprising providing an apparatus conrprising a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casinc) hanyer, a landing sub attached to the casing hanger, and an isolatiori device attached to the Iandng sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landina sub; Ianding the apparatus at the well bore -vvherein the isolation device provides fluidic isolation of' a portion of an outer a_nnulus of the well bore; providing a cement slurry; introducing the cement slurry into the outer annulus of the well bore via the f_Iuid port;
and allowing the cement slurry to set up in the outer annulus of the weil bore.
[0009j In another embodiment, the present invention provides ar_ apparatus for providinia fluidic access to an outer annulu`q of a casing string within ax7v~ell bore comprising a casing hanuer, the casing hanger cosnprising a fiuid port wherein the fluid port provides fluidic access to an outer annulus by allowrinD fluid to pass throueh the casing hanger; a landing sub attached to the casina hanaer; and an isolation device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub from a poriion of the outer annulus of the well bore.
[0010] In other embodiments, the present invention provides a reverse circulation cernentine, systeni coinprisrng a casing string disposed within a well bore, the well bore havlnV
an outer annulus forned by t.he casing string being disposed within the well bore; a casinQ
hanger disposed about a lon,itudinal portion of the casing string, the casing hanger comprising a fluid port ,~vherein the iluid port provides fuidic access to an outer annulus by a1loxing fluid to pass through the casing hanger; a landing sub atiached to the casing han-er;
ai}d an isolation device attached to the landing sub tvherein the isolation device adapted to allowfluidic isolation.
of a portion of the Ianding su.b from a portion of the outer. annulus of the well bore.
[0011] The features and advantages of the present invention 1~'i3l be apparent to those skilled in the art. While numerous changes may be made by those skilled in the art, such changes are within the spirii of the invention.
ERIIEF DESCRIPTION OF THE DP.ANVINGS
[00]2] These drawings illustrate certain aspects of some of the einbodimen.ts of the present invention, and should noi be used to limit or define the invention.
[0013] Figure 1 illustrates a cross-seetional view of an apparatus for providing fluidic access tc the outer annulus of a casin2 string in a well bore in accordance ti6th one embodi--nent of the present invention.
100141 Fig-ure 2A illustrates a cross-sectional view of a portion of ;ui apparatus for providina fluidic access to an outer annulus of a casing string showing a hardenina tluid being used to provide fluidic isolation of a portion of a landing sub from the outer annulus of the casing string in accordance Nvith one embodirnent of the present invention.
[0015] Figure 2B illustrates a cross-sectional view of a well bore after removal of a portion of the apparatus of Figure 2A in accordance with one embodiment of the pre,sent invention.
[0016] Figure 2C iilustrates a cross-sectional view of well bore after removal of the apparatus of Figures 2A and 2B in accordance with one embodiment of the present invention.:
[0017.1 Figure 3, lllustrates a Cr{Jss-s?Ctlonal view of an, isolation device of an apparatus for providinff fluidic access to an outer annulus of a casing string, interactinc, with its environment in accordance with one ernbodiment of the present invention.
[0018] Figure 4 illustrates a cross-sectional view of an isolation device interacting a"ith ]ts environnlent in accordance with one embodiment of the present invention.
[0019] Figure 5A illustrates a cross-sectional view of aal apparatus for providing fluidic access tc an outer annulus of a casin-, string, the apparatus containing a slip shoum in its instalIed posiiion.
[0020] Figure 5B illustrates a detailed vie~N, of the slip arrangement of the apparatus of Figure 5A, for providinQ fluidic access to an outer annulus of a casing strring.
[0021] Figure 5C illustrates a cross-sectional view, of the apparatus of Figure 5A aher enr=a,ement of the slip with a subsurface casinb strin-.
[0.022] Figure 5D illustrates a detailed view of the slip arrangement of the apparatus of Fiaure 15C, after engaQement of the mecharrical slip with a subsurface casing strin<.,r.
[0023] Figure 5E illustrates a cross-sectional view of the apparatus of FiETure 3C.show>ing tlte mechanical slip in the process of being returned to its original installed position.
[0024] Figure 5F illustrates a detailed view of the slip arranLAment of the apparatus of Fiaure 5E showing the mechanical slip iri the process of being returned to its original installed position.
[0025] Figure 5G illustrates a cross-sectional view of the apparatus of Figure 5E showing the mechanical slip in the process of being returned to its original installed position, after shearing of a pin connecting an inner ring and a wedge.
[0026] Figure 6H illustrat.es. a detailed view of the slip arranaement of the apparatus of Finure SG showing the mechanical slip in the process of being, returned to its original installed position, after shearing of a pin connecting an inner ring and a wedge_ rU027] Figure 51 illustrates a cross-sectional vielaJ of the apparatus of Figuxe 5Ci with the mechanical slip full}r disengaged from a subsurface casing strincl.
[0028] Figure 5J illustrates a detailed view of the slip arrangement of -51 after the mechanical slip is full}T disengaged from a subsurface casing string. -I:}E T AIf1EU DESCRIPTION
[0029 j The present invention relates to methods and devices for completion of ZveIl bores and more particularly, to reverse circulation cementing of casing strings in well bores.
[0030] Tlle methods and devices of the present invention may allow for an improved reverse circulation cementing of the ain-iular space of a casing to be cemented. In particular, the xeverse circulation cementing devices and methods of the present invention may provide an improved fluidic isolation of a well bore outer annulus for cernenting casing in well bores_ in certain embodiments, a device of the present invention may comprise a casing han-er, the casing hani~er comprisincy a fl uid port wherein the fluid port provides f7uidic access to an outer annulus by allowing fluid to pass throuab the casin-, hanger; a landing sub attached to the casinc, hanger;
and an isolation device attached to the landing sub wherein the isalation device is adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.
[003 1] To facilitate a better understanding of the present invention, the followinir examples of certain embodirients are given. In no way should the following examples be read to limit, or define, die scope of the invention.
[0032] Figure I illustrates a;;ross-sectior,al viezv of reverse circulation cementing a.ppa3:atus 100 ini.eractiirg Krith casing string 105 in a well bore in accordance with one embodiment of the present invention. Casing hanger I 10 may be attached to landing sub 130 by collar 115 or any attachment means knti-wn in the art. Although landing sub 130 is depicted as a separate piece. from casing banger 110, landin~ sub 130 may be integral to casing hanaer. 110 in certain embodiments. Landing sub 130 may seat against ground 12>, or any other support structure near the (yround, to provide support for reverse circulation cementing apparatus 100.
Casing hanger 110 may comprise a fluid port 1?0. Fluid port 120 may be used, among other things, to introduce cement slurry compositions to outer annulus 1-50 by way of f.luid conduit 123. . In certain embodiments, fluid port 120 may be integral to casing haai-er 110. Isolation device 140 may provide fluidic isolation of outer annulus 150. In this way, fluid introduced into outer annulus 150 is prevented from exiting outer annulus 150 by leakage around landinb sub 130. Ilotvever, the fluid insertion tube 145 may be any means for insertin~
.f.luid.
[0033] Isolation device 140 may be any device that provides at least partial tluidic .solation of outer annulus 130. In certain embodiments, isolation device 140 maV comprise a rubber cup, a cement basket, or a retrievable packer. In the embodiment depicted in Figure 1, isolation device 140 is shovNm as an inflatable tube. The inflatable tube may be expanded or inflated with a fluid. In certain embodiments, the fluid ma)- be a hardening fluid, which may be a settable fluid capable of permanently hardening in a portion of outer annulus 150. Fluid insertion tube 145 may be used to introduce a fluid into isolation device 140 as necessary. In certain embodiments, fluid insertion tube 145 may be a hose.
[0034] Sealing mandrel 160 may be attached to casing hanger 110 by any means known in the art. In certain embodiments, sealing mandrel 160 may be integrat to casing hanger I 10. In the embodiment depicted in Figure 1, sealing mandrel 160 is shotivn as attached to casing hanger 110 via load bearing ring 170. Load bearing ring 170 is in turn attached to turnbuekles 163 and 165 via bolt 167. Sealing mandrel 160 may also be attached to casing string 105 via casing collars l72 and 174. In this way, sealing mandrel 160 mav support the weight of casing string 105.
L00351 Conversely, sealina mandrel 160 may be removed from reverse circulation cementing apparatus 100 by removing bolt 167 from tu.rnbucl_-?es 163) and 165 thus allowing for the release of sealing mandrel 160 from casing hanger 110.
[00361 Handling sub 180 may optionally be attached to sealing rian.drel 160.
Handling sub 180 allows for external handling equipment to attach to and manipulate as necessary reverse circulation cementing apparatus 100. Likewise, landing eye 135 also allows for =external nandling equipment to attach to and manipulate as necessary reverse circulation cenlenting apparatus 100. In this way, casing hanger 110 in conJunction with sealing mandrel 160 may support the weijht of casing string 105_ L003711 Figures 2A-2C illustrate a cross-sectional view of a portion of a reverse circulation cementing appararus showing a hardening fluid being used to provide t~uidic isolation of a portion of a landing sub from the outer annulzzs of the casing string. in accordance with one embodiment of the present invention.
[0038] Fluid insertion tube 245 may be used to introduce a hardenin(y fluid, for example, cement, into isolaaion device 240, depicted here as an expandable tube. By sealing off the top portion of outer annulus 250, isolation device 340 provides fuidic isolation of outer annulus 250.
[0039] As in Figure 1, Figure 2A shows casing hanger 210 attached to landina sub 2?0 via collar 215. Casing collar 21 -5 niay be removed to allow casing hanger 210 to detach (as illustrat.ed in Fiaure 2B).
[0040] Figure 2B illustrates a cross-sectional view of ivell bore after removal of a portion of the reverse circulation cementing apparatus of Figure 2A in accordance wi-Cr, one embodiment of the present inventio.n.
[0041] In Figure 2B, landing sub 230 is shoNvn after detachment of.casing hanL7er 210. In certain cmbodiments, landing sub 230 may be left at the well site permanently.
ln still other embodimenis, landino sub 230 may be removed. In such a removal; pin 233 may be removed to allow detachment of landinc, sub 230.
[0042] Figure 2C illustrates a cross-sectional view of well bore after removal of a portion of the reverse circulation cementing apparatus of Figures 2A and 2B in accordance with one embodiment of the present invention. In particular, Figure 2C shows the remaining portion of the reverse circulation cementing apparatus after removal of landing sub 2 30.
Casing string 205 remains in piace in the well bore after removal of Ianding sub 230. Remaining outer annular sleeve 23 7 may be severed at around level or left in place as desired.
[0043] Figure 3 illustrates a cross-sectional view of an isolation device of a reverse circulation cementing apparatus :nteract:ng ~v2th its environment in accordance with one embodiment of the present invention. In particular, isolation deviLe 340, represented schematically, may be any device suitable for providing fluidic isolation to the outer annulus.
Suitable examples include cement basket isolation devices or a rubber cup isolation devices. In either case, isolation device 3'10 prqvides fluidic isolation of outer a.nnulus 350. Fluid insetiron port 347 may be used to introduce a hardenable fluid to provide additional fluidic isolation optionally as desired. ln certain embodiments, such as when a hardenable fluid is used, the reverse circulation cementing apparatus may be permanently affixed to the vvell head.
[i}044] Figure 4 illustrates a cross-sectional view of a retrievable cup or inflatable packer interacting with its environment in accordance. with one embodiment of the present invention.
Isolation device 440, depicted as a retrievable cup in this embodiment, may provile fluidic isolation of outer annulus 450. Certain eribodiments of the reverse circulation.ccmenting apparatus may forego the use of a hardenable fluid such as -%vhen a retrievable cup is used.
[0045] Figures 5A and 5B illustrate a cross-sectional view of siip apparatus 500 to prevent the "floatinb" of the casing string on top of the cement slurry, the apparatus having mechanical slip 560 for preventing "floating" of the casing string 505. In Figures SA and 5B, slip apparatus 500 is shown in its original installed position. Figures 5C and 5D illustrate mechanical slip 560 of apparatus 500 being engaged to subsurface casing string 555. Successive Figures 5E-5J illustrate the subsequent disengagement of apparatus 500 to return rnech.anical slip 560 to its original installed position.
[0046] Figure 5A illustrates an overview of slip apparatus 500 inieracting w-ith subsurface casing string 555 cemented into a well bore. Figure 6I3 illustrates a detailed view of mechanical slip 560 of apparatus 500. Loolcing initiaily at Figure 5A, an overview of apparatus 500 is shown in its original installed position. As in Figure 1, FiQure aA
shows casing hanger 10 attached to landing sub 530 via collar 515. The portion of apparatus 500 positioned above collar 5 15 (not illustrated) is as described in Figure 1. In the embodiment depicted in Figure 5A, an actuating mandrel 520 is in communication with ports 521 and 522. Actuating ma,ndrel 520 may translate dovrnward in response to a pressure applied to port. 521.
Actuating manclrel 520 may translate upwar d=;r, response ic a pressure applied to port 522.
[0047] Isolation device 540, depicted as a retrievable cup in this en-ibodiment, may be in engagement with subsurface casing string 555, which in ti~us en, bodlment, is cemented into place within the well bore. By engaging subsurface casing string 555, isolation device 540 provides fluidic isolation of outer annulus 550.
[0048] In this embodiment, casing string 505 connected by collar 576 may be positioned internal to subsurface casing string 555. Positioned above isoiation device .540 is illustrated mechanical slip 560, in accordance witii one embodiment of the present invention, which is depicted in Figure 5B in an enlarged view.
[0049] Turning to Figure 5B, in more detail, in this embodiment, mechanical slip 560 is in its original installed position. Mechanical slip 560 is disengaged frona the subsurface casing string 555 and is positioned on an inclined surface of wedge 565. Mdge 565 is attached by a shear pin 567 to inner ring 5570. Wedge 56> may have fin;ers (not illustrated) ~vhich are grooves internal to wedge 565 that are compressed as a result of contact with inner ring 570. Flexible member 572 is attached to mechanical siip 560 to aid in the retention of mechanical slip 560 in the disengaged position. In certain embodiments, flexible mernber 572 may be a spring.
Flexible member 572 is further attached to retaining ring 574. Any suitable means lcnovvn in the art may be used to attach flexible member 572 to retaining ring- 574 and mechanical slip 560, in this embodiment, retaining ring 574 is coupled to actuatin4 mandrel 520 b3-. a shear pin 576. AUy suitable means knoi-vn in the art may be used to attach actuating mandrel 520 to retaininU rin, 574. Positioned on the lower portion of actuating mandrel 520 is a snap ring 580, which in this initial position, is engaged vvith inner ring 570.
[0050] Figures 5C and 5D illustrate the mechanical slip 560 of Figures 5A and enga-ed tij-ith a subsurface casing 555. Figure 5C shows an oven-iew view of mechanical slip 560 engaged Arith the subsurface casing string 555. In this position, mechanical slip 560 may prevent casing string 505 from "floating" during reverse cementing operations.
In the embodiment illustrated in Figure 5C, pressure has been applied to the actuating mandrel -520 via port 5221. 117he amount of pressure applied to the mandrel is sufficient to allow the mechanical slip 560 to enaage the subsurface c~asing string 555. In certain embodi.ments, the pressure applied ma_y be pressure resulting from injection of fluid into the port 52 1.
As shown in Fi2ure 5C, the pressure applied ro actuating mandrel -;20 forces mandrel 520 do~-vnulard, further into the Nvell bore. The shear pin 5716 coupling retaining ring 5 74 and actuating mandrel 520 is sheared., as shown in fii-mure 5D. As actuating mandrel 520 compresses retainina ring 574. mechatiical slip 560 is forced down the inclined surface of wedge 565 and er_gages the subsurface casing strino 555. Flexible member 57-2 is pulled into tension as mechanical slip 560 engages the subsurface ca4in{= string 555. Snap ring 580 is disengatred from inner ring 570, as a result of the change in position of the mandrel 520. Mechanical slip 560 is now engaged with subsurface casing string 555 and a reverse cementing job may be performed without "floating" the casing string 50>. Although mechanical slip 560 is depicted engaged with subsurface casing string 505, mechanical slip 560 may be adapted for use in an open hole without subsurface casing in certain embodiments.
[005 ] Figures 5E and SF illustrate th::- apparatus 500 of Figures 5C and 5D
in the process of d'zsenQa~,=ement of mechanical slip 560 f,:om subsurface casing 555. The disLngagement of mechanical slip 560 may occur subsequcnt to a reverse circulation cementing job. In this embodiment illustrated in Figure SE, to beain the process of dis::ngagement of inechanical slip 560 from the subsurfa.ce casing 555, pressure is applied at port 522 to actuatinU
mandrel 5'210. As pressLtre is applied to actuatina mandrei 520, actuatin(y rnandrel 520 moves upward in response such that snap ring 580 ennages inner ring 570, as illustrated iri I=igure. SF.
[0052] FiQures 5G and 5I3 shov.=s the apparatus 500 as it continues the process of disen~agement of mechanical sIip 560 from subsurface casing 555. As pressure is continued to be applied to actuating n:andrel 520 through port 522, snap ring 580 is forced further upward a`rainst the lower surface of inner rint, 570, as shown in Figure 5H. The force is sufficient such that sh.ear pin 567 connecting inner ring 570 and wedge 565 is sheared, thereby releasing inner ring 570 from wed2e 565. As actuatina mandrei 520 continues to move upward, snap ring 580 and inner ring 570 are forced upward until inner ring 570 contacts the upper portion of mechanical slip 560 and be-ins to pull mechanical slip 560 a-Nvay from the subsurface casing strinL~, 555. With the removal of inner ring.570 from its initial position, the fmgers of wedaL. 565 fle,, away from mechanical slip 560, tivhich aid in disengaging mechanical slip 560 from subsurface casin- strinQ 5~5.
[0053 ] The continued pressure applied via port 522 to actuating mandrel 520, illustrated in Fl-Ilire j1, results in Conlplete dlsengagement of mechan3Cal sllp 560 -fxon2 3llbs'lrface Casing, string 555. Snap ring 580 and iriner ring 570, continue to pt:li mechanical slip 560 until can-iplete disenaaoernent of inechanical slip 560 from subsurface casing strinfy 555 is achieved, iliustrat¾d in Figiire 5?. Fiexible mPmb:;r 572 returns to its initial relaxed position, thereby further aiding the disenaaLTenlent of mechanical slip 560 from subsurface casinG strinc-, 555.
[00 54] "fherefore, the present invention is well adapted to attain the ends and advantaaes mentioned as well as those that are inherent th.erein. The particular embodiments disclosed above are illustrative only, as the present invention may be modified and practiced i_n difiLrent but equi~raien*: manners apparent to those sl:illed in the art haz~ing the beneft of the teach.inf~s herein. Furthermore, no limitations are intended to the details of construction or desigr~ herein shown, other than as described in the claims below. It is therefore evident that the particular illustrative embodiments disclosed above may be altered or modified and all such variations are considered ~7,ith.in the scope and spirit of the present invention. Also, the terms in the claims have their plain, ordinary meanina unless otherwise explicitly and clearly defined by the patentee.
Claims (20)
1. A method for providing fluidic access to an outer annulus of a casino string within a well bore comprising.
providing an apparatus comprising a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger, a landing sub attached to the casing hanger, and an isolation, device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub;
landing the apparatus at the well bore wherein the isolation device provides fluidic isolation of a portion of an outer annulus of the well bore;
providing a cement slurry;
introducing the cement slurry into the outer annulus of the well bore via the fluid port; and allowing the cement slurry to set up in the outer annulus of the well bore.
providing an apparatus comprising a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger, a landing sub attached to the casing hanger, and an isolation, device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub;
landing the apparatus at the well bore wherein the isolation device provides fluidic isolation of a portion of an outer annulus of the well bore;
providing a cement slurry;
introducing the cement slurry into the outer annulus of the well bore via the fluid port; and allowing the cement slurry to set up in the outer annulus of the well bore.
2. The method of claim 1 wherein the casing hanger is disposed about a longitudinal portion of the casing string.
3. The method of claim 1 wherein the casing hanger is adapted to be removably disposed about a longitudinal portion of the casing string.
4. The method of claim 1 wherein the isolation device is a retrievable rubber cup or a retrievable inflatable packer.
5. The method of claim 1 wherein the isolation device is a cement basket or a permanent inflatable tube.
6. The method of claim 1 further comprising the step of removing the casing hanger, leaving behind the isolation device and the landing sub.
7. An apparatus for providing fluidic access to an outer annulus of a casing string within a well bore comprising:
a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger;
a landing sub attached to the casing hanger; and an isolation device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.
a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger;
a landing sub attached to the casing hanger; and an isolation device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.
8 The apparatus of claim 7 wherein the casing hanger is disposed about a longitudinal portion of the casing string.
9. The apparatus of claim 7 wherein the casing, hanger is adapted to be removably disposed about a longitudinal portion of the casing, string.
10. The apparatus of claim 7 wherein the isolation device is a retrievable rubber cup or a retrievable inflatable packer.
11. The apparatus of claim 7 wherein the isolation device is a cement basket or permanent inflatable tube.
12. The apparatus of claim 7 further comprising, a slip apparatus.
13. A reverse circulation cementing system comprising:
a casing string disposed within a well bore, the well bore having an outer annulus formed by the casing string being disposed within the well bore;
a casing hanger disposed about a longitudinal portion of the casing string, the casino hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger;
a landing sub attached to the casing hanger; and an isolation device attached to the landing sub wherein the isolation device adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.
a casing string disposed within a well bore, the well bore having an outer annulus formed by the casing string being disposed within the well bore;
a casing hanger disposed about a longitudinal portion of the casing string, the casino hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger;
a landing sub attached to the casing hanger; and an isolation device attached to the landing sub wherein the isolation device adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.
14 The system of claim 13 wherein the casing hanger is disposed about a longitudinal portion of the casing string.
15. The system of claim 13 wherein the casing hanger is adapted to be removably disposed about a longitudinal portion of the casing string.
16. The system of claim 13 wherein the isolation device is a retrievable rubber cup
17. The system of claim 13 wherein the isolation device is a retrievable inflatable packer.
18. The system of claim 13 wherein the isolation device is a cement basket or permanent inflatable tube.
19. The system of claim 13 wherein the isolation device is a permanent inflatable tube.
20. The system of claim 13 further comprising a slip apparatus.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/539,473 | 2006-10-06 | ||
| US11/539,473 US7597146B2 (en) | 2006-10-06 | 2006-10-06 | Methods and apparatus for completion of well bores |
| PCT/GB2007/003804 WO2008041006A1 (en) | 2006-10-06 | 2007-10-05 | Methods and apparatus for reverse circulation cementing of casing strings in wellbores |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2663358A1 CA2663358A1 (en) | 2008-04-10 |
| CA2663358C true CA2663358C (en) | 2011-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2663358A Active CA2663358C (en) | 2006-10-06 | 2007-10-05 | Methods and apparatus for reverse circulation cementing of casing strings in wellbores |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7597146B2 (en) |
| CA (1) | CA2663358C (en) |
| WO (1) | WO2008041006A1 (en) |
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| US9334700B2 (en) | 2012-04-04 | 2016-05-10 | Weatherford Technology Holdings, Llc | Reverse cementing valve |
| US9434875B1 (en) | 2014-12-16 | 2016-09-06 | Carbo Ceramics Inc. | Electrically-conductive proppant and methods for making and using same |
| EP2941532A4 (en) | 2013-01-04 | 2017-04-19 | Carbo Ceramics Inc. | Electrically conductive proppant and methods for detecting, locating and characterizing the electrically conductive proppant |
| US11008505B2 (en) | 2013-01-04 | 2021-05-18 | Carbo Ceramics Inc. | Electrically conductive proppant |
| US9551210B2 (en) | 2014-08-15 | 2017-01-24 | Carbo Ceramics Inc. | Systems and methods for removal of electromagnetic dispersion and attenuation for imaging of proppant in an induced fracture |
| CN106869833A (en) * | 2017-03-07 | 2017-06-20 | 高飞 | A kind of slurry basket fastener |
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-
2006
- 2006-10-06 US US11/539,473 patent/US7597146B2/en active Active
-
2007
- 2007-10-05 WO PCT/GB2007/003804 patent/WO2008041006A1/en active Application Filing
- 2007-10-05 CA CA2663358A patent/CA2663358C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008041006A1 (en) | 2008-04-10 |
| US7597146B2 (en) | 2009-10-06 |
| CA2663358A1 (en) | 2008-04-10 |
| US20080083535A1 (en) | 2008-04-10 |
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