US20080289812A1 - System for downhole packing - Google Patents
System for downhole packing Download PDFInfo
- Publication number
- US20080289812A1 US20080289812A1 US11/936,278 US93627807A US2008289812A1 US 20080289812 A1 US20080289812 A1 US 20080289812A1 US 93627807 A US93627807 A US 93627807A US 2008289812 A1 US2008289812 A1 US 2008289812A1
- Authority
- US
- United States
- Prior art keywords
- seal material
- liner
- tool
- wellbore
- injecting
- 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.)
- Abandoned
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Classifications
-
- 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
- E21B33/12—Packers; Plugs
- E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- 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)
- Gasket Seals (AREA)
- Sealing Material Composition (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
An apparatus and method of forming a barrier to fluid flow behind a liner are provided. In one embodiment of the invention, a method includes the steps of conveying a tool to a position within a wellbore having a liner, the tool carrying a seal material, and injecting the seal material from the tool through the liner to form a barrier to fluid flow behind the liner. In another embodiment of the invention, the apparatus includes a housing having a chamber carrying a seal material, and a means for injecting the seal material through the wellbore liner.
Description
- This application claims the benefit of U.S. Provisional Patent Application No. 60/910,846 filed Apr. 10, 2007.
- The present invention relates in general to wellbore or borehole operations and more particularly to a methods and systems for creating seals in a wellbore utilizing a tool element that emits sealing material to form a seal between the tubing and the wellbore.
- As more oilfields become mature, the need for side tracking existing wells and through tubing completions to improve production from these aging wells increases. Through tubing expandables and slotted liners may be used for side tracking and through tubing completions. Typically, at some point in the well's life, it is desired to segment or compartmentalize the well for selective treatment of a zone or to prevent encroachment of an undesired fluid. Unfortunately, through tubing expandables and slotted liners make it difficult to segment or compartmentalize the wellbore. Conventional packers do not allow segmenting or compartmentalizing these wellbores without considerable expense.
- Therefore, it is a desire to provide a system and method for providing a seal behind a wellbore liner.
- Apparatus and methods of forming a barrier to fluid flow behind a wellbore liner are provided. In an embodiment of the invention, a method includes the steps of conveying a tool to a position within a wellbore having a liner, the tool carrying a seal material, and injecting the seal material from the tool through the liner to form a barrier to fluid flow behind the liner.
- In an embodiment of the invention, an apparatus includes a housing having a chamber carrying a seal material, and a means for injecting the seal material through the wellbore liner. The seal material may react to the hydrocarbons present in the wellbore to form the barrier. The seal material may be thixotropic in nature and/or a swellable material to facilitate placement through the liner while forming a suitable sealing plug where desired.
- The foregoing has outlined 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 which form the subject of the claims of the invention.
- The foregoing and other features and aspects of the present invention will be best understood with reference to the following detailed description of a specific embodiment of the invention, when read in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is a schematic side view of an embodiment of the sealing method of the present invention; and -
FIG. 2 is a further view of the sealing method illustrated inFIG. 1 . - Refer now to the drawings wherein depicted elements are not necessarily shown to scale and wherein like or similar elements are designated by the same reference numeral through the several views.
- As used herein, the terms “up” and “down”; “upper” and “lower”; and other like terms indicating relative positions to a given point or element are utilized to more clearly describe some elements of the embodiments of the invention. Commonly, these terms relate to a reference point as the surface from which drilling operations are initiated as being the top point and the total depth of the well being the lowest point.
-
FIG. 1 is a schematic side view of an embodiment of the sealing method of the present invention, generally denoted by thenumeral 10. A portion of awellbore 12 is completed with aliner 14.Liner 14 may include one or more openings orperforations 16 along its length. For clarity,liner 14 is depicted inFIGS. 1 and 2 withmultiple openings 16. As used herein,liner 14 includes any tubing, liner or screen that has openings 16.Openings 16 may be formed therethrough prior to hanging the tubular in thewellbore 12 or in the wellbore with punches, explosive charges, mills, drills and the like. Liner 14 may be cemented or non-cemented. Examples ofliners 14 include slotted, perforated, or predrilled liners, or a screen or a pre-packed screen. Anannulus 18 is formed betweenliner 14 and the wall 20 ofwellbore 12. - It is desired to seal
annulus 18 in aregion 22. In the first step ofsealing method 10, atool 24 is positioned withinliner 14proximate region 22 viaconveyance 42.Tool 24 includes, but is not limited to, ahousing 26 having achamber 28 carrying aseal material 30,injection mechanism 32, and one ormore ports 34 connected tochamber 28.Tool 24 may also include locatingsub 38 and sealingmembers 40.Tool 24 may also include perforating guns, drilling mechanisms or cutting mechanisms suitable for creating anopening 16.Conveyance 42 may be an electric line, coiled tubing (CT), jointed tubing, a wireline or a slickline.Injection mechanism 32 includespiston 44 in communication withchamber 28.Injection mechanism 32 includes pressurizedfluid 46 to hydraulically actuate or motivatepiston 44 againstchamber 28 to expelseal material 30 fromchamber 28.Sealing members 40 are positioned about theports 34 and are actuatable or hydraulically expandable to aposition engaging liner 14. -
Tool 24 may be constructed for multiple tubing sizes. Beforetool 24 is positionedproximate region 22,tool 24 may need to be run throughtubing 50 havingbore 56 until it reachesregion 52, which has abore 58 greater thanbore 56, whereliner 14 is deployed. Astool 24 passes throughtubing 50, sealingmembers 40 may actuate or hydraulically expand to engageliner 14 to help positiontool 24 into thislarger bore region 52. - In the second step of
method 10,tool 24 is positionedproximate opening 16, or, if necessary, forms anopening 16 inliner 14 using conventional means. In the third step ofmethod 10, sealingmembers 40 may actuate to aposition engaging liner 14 to form achannel 54 betweenhousing 26 andliner 14 for injecting theseal material 30 behindliner 14. - Referring now to
FIG. 2 , in the fourth step ofmethod 10, a signal is sent toinjection mechanism 32 to actuate the injection mechanism. The signal may be an internal signal withintool 24, a mud pulse, a wireless or wired transmission or the like. In the fifth step ofmethod 10,injection mechanism 32 is actuated, and pressurizedfluid 46 movespiston 44 throughchamber 28 to ejectseal material 30 fromchamber 28.Tool 24 then expelsseal material 30 viaports 34 throughchannel 54 to injectseal material 30 throughliner 14, as indicated by the arrows. In the sixth step ofmethod 10,seal material 30 reacts with hydrocarbons inannulus 18 and formssealing plug 48 behindliner 14 withinregion 22.Sealing plug 48 may be formed circumferentially aboutliner 14. - To form
sealing plug 48,seal material 30 must be suitable for injecting throughaperture 16 and for setting into asealing plug 48 in reaction with contact with hydrocarbons. Thus, it is desired thatseal material 30 be thixotropic in nature so that it will set and become substantially “self-supporting” relatively quickly. It may further be desired forseal material 30 to be a swellable material, so as to sealopenings 16 inregion 22. The swellable property further facilitates sealing betweenwellbore 12 andliner 14. It may further be desired forseal material 30 to have a sufficiently high gel strength so as to remain where placed, yet allow for a degree of gravity-induced flow to the lower portion ofregion 22, for example in horizontal wellbores. It is noted thatseal material 30 may include one or more of the desired properties. It is further noted, and will be recognized with the above description of the method, that sealingplug 48 may be formed in stages or by one ormore seal materials 30. For example, afirst seal material 30 being primarily thixotropic in nature may be injected through opening 16 intoregion 22 and then followed with a secondswellable seal material 30. It may also be desired to inject spacing fluids, such as water or drilling fluid, after one or more seal material injections. - Examples of
suitable seal material 30 include, without limitation, foamed cements; unfoamed cements containing smectic clays such as bentonite and attapulgite, unfoamed cements containing welan gum, aluminum and/or iron sulphate, and/or calcium sulfate as thixotropy agents, thermosetting polymers such as epoxy, vinylester, phenolic and polyester resins, and cross-linking polymer gels (possibly with an added thixotrope). -
Swellable seal material 30 swells from an unexpanded state to an expanded state when it comes into contact with or absorbs hydrocarbons. The hydrocarbons may be present naturally inwellbore 12, or present in theformation surrounding wellbore 12 and produced into the wellbore. - Examples of suitable
swellable seal material 30 and their corresponding triggering fluids (listed in parenthetical) include, without limitation: liquid hydrogel (hydrocarbon); Bacel® hardfoam (hydrocarbon); ethylene-propylene-copolymer rubber (hydrocarbon oil); ethylene-propylene-diene terpolymer rubber (hydrocarbon oil); butyl rubber (hydrocarbon oil); haloginated butyl rubber (hydrocarbon oil); brominated butyl rubber (hydrocarbon oil); chlorinated butyl rubber (hydrocarbon oil); chlorinated polyethylene (hydrocarbon oil); styrene butadiene (hydrocarbon); ethylene propylene monomer rubber (hydrocarbon); natural rubber (hydrocarbon); ethylene propylene diene monomer rubber (hydrocarbon); ethylene vinyl acetate rubber (hydrocarbon); hydrogenised acrylonitrile-butadiene rubber (hydrocarbon); acrylonitrile butadiene rubber (hydrocarbon); isoprene rubber (hydrocarbon); chloroprene rubber (hydrocarbon); and polynorbornene (hydrocarbon). - In the embodiment illustrated in
FIGS. 1 and 2 ,tool 24 carries bothseal material 30 andinjection mechanism 32 to facilitate a single trip into the well to create sealingplug 48 behindliner 14. By providing bothseal material 30 andinjection mechanism 32 withintool 24,method 10 allows for the creation of sealingplug 48 without the need for separate surface devices to pump or deliverseal material 30 downhole toregion 22.Tool 24 may further include aids, such as a source of heat or radiation, to facilitate or aid the setting of sealingplug 48. The viscosity ofseal material 30 may be varied based on the desired isolation length. - From the foregoing detailed description of specific embodiments of the invention, it should be apparent that a system and method for downhole packing that is novel has been disclosed. Although specific embodiments of the invention have been disclosed herein in some detail, this has been done solely for the purposes of describing various features and aspects of the invention, and is not intended to be limiting with respect to the scope of the invention. It is contemplated that various substitutions, alterations, and/or modifications, including but not limited to those implementation variations which may have been suggested herein, may be made to the disclosed embodiments without departing from the spirit and scope of the invention as defined by the appended claims which follow.
Claims (20)
1. A tool for creating a barrier to fluid flow behind a wellbore liner, the tool comprising:
a housing having a chamber carrying a seal material; and
a means for injecting the seal material through the wellbore liner.
2. The tool of claim 1 , wherein the injecting means includes a motivation mechanism in communication with the chamber.
3. The tool of claim 2 , wherein the motivation mechanism comprises a pressurized fluid.
4. The tool of claim 1 , wherein the injecting means includes spaced sealing members, the opposed sealing members actuatable to a position engaging the wellbore liner to form a channel between the housing and the wellbore liner for injecting the seal material behind the wellbore liner.
5. The tool of claim 1 , wherein the seal material is a liquid when disposed in the housing.
6. The tool of claim 1 , wherein the seal material is a foam when disposed within the housing.
7. The tool of claim 1 , wherein the seal material forms a barrier to fluid flow in reaction to contact with hydrocarbons.
8. A method for creating a barrier to fluid flow behind a wellbore liner, the method comprising the steps of:
conveying a tool to a position within a wellbore having a liner, the tool carrying a seal material; and
injecting the seal material from the tool through the liner to form a barrier to fluid flow behind the liner.
9. The method of claim 8 , wherein the seal material is liquid when disposed in the housing.
10. The method of claim 8 , wherein the seal material is a foam when disposed in the housing.
11. The method of claim 8 , further including the step of forming a channel between the housing and an inner surface of the liner for injecting the seal material behind the liner.
12. The method of claim 11 , wherein the step of forming a channel includes extending a seal mechanism from the tool into engagement with the liner.
13. The method of claim 12 , further comprising the step of forming an opening in the liner.
14. The method of claim 13 , wherein the step of injecting the seal material through the liner comprises the step of injecting the seal material through the opening.
15. The method of claim 14 , further comprising the step of conveying the tool from a first region of the wellbore with a first bore to a second region of the wellbore with a second bore, wherein the second bore is larger than the first bore and the liner is positioned within the second region.
16. The method of claim 15 , further comprising the step of extending the seal mechanism from the tool to position the tool within the second region.
17. The method of claim 16 , wherein the seal material is swellable.
18. The method of claim 17 , wherein the seal material swells from an unexpanded state to an expanded state when the seal material contacts hydrocarbons.
19. The method of claim 18 , wherein the seal material is thixotropic.
20. The method of claim 19 , further comprising the step of selecting a viscosity of the seal material based on a desired length of the barrier.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/936,278 US20080289812A1 (en) | 2007-04-10 | 2007-11-07 | System for downhole packing |
MX2008004387A MX2008004387A (en) | 2007-04-10 | 2008-04-02 | System for downhole packing. |
NO20081711A NO20081711L (en) | 2007-04-10 | 2008-04-09 | Downhole gasket system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US91084607P | 2007-04-10 | 2007-04-10 | |
US11/936,278 US20080289812A1 (en) | 2007-04-10 | 2007-11-07 | System for downhole packing |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080289812A1 true US20080289812A1 (en) | 2008-11-27 |
Family
ID=40071324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/936,278 Abandoned US20080289812A1 (en) | 2007-04-10 | 2007-11-07 | System for downhole packing |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080289812A1 (en) |
CN (1) | CN101498203A (en) |
MX (1) | MX2008004387A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090038796A1 (en) * | 2007-08-10 | 2009-02-12 | Baker Hughes Incorporated | Expandable leak path preventer in fluid activated downhole tools |
US20100212914A1 (en) * | 2009-02-20 | 2010-08-26 | Smith International, Inc. | Hydraulic Installation Method and Apparatus for Installing a Submersible Pump |
US20110174486A1 (en) * | 2010-01-19 | 2011-07-21 | Halliburton Energy Services, Inc. | Wellbore Perforation Tool |
US20110253373A1 (en) * | 2010-04-12 | 2011-10-20 | Baker Hughes Incorporated | Transport and analysis device for use in a borehole |
US20120138315A1 (en) * | 2008-09-19 | 2012-06-07 | Swellfix B.V. | Downhole Seal |
WO2020223241A1 (en) * | 2019-04-29 | 2020-11-05 | Saudi Arabian Oil Company | Isolation polymer packer |
GB2591247A (en) * | 2020-01-21 | 2021-07-28 | Equinor Energy As | Retrofit expandable annulus sealing (REAS) |
US11572761B1 (en) | 2021-12-14 | 2023-02-07 | Saudi Arabian Oil Company | Rigless method for selective zonal isolation in subterranean formations using colloidal silica |
US11708521B2 (en) | 2021-12-14 | 2023-07-25 | Saudi Arabian Oil Company | Rigless method for selective zonal isolation in subterranean formations using polymer gels |
US11802232B2 (en) | 2021-03-10 | 2023-10-31 | Saudi Arabian Oil Company | Polymer-nanofiller hydrogels |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MX359717B (en) * | 2013-02-27 | 2018-10-08 | Halliburton Energy Services Inc | A mill diverter having a swellable material for preventing fluid flow past the material. |
US9464502B2 (en) | 2013-02-27 | 2016-10-11 | Halliburton Energy Services, Inc. | Mill diverter having a swellable material for preventing fluid flow past the material |
Citations (14)
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US4235291A (en) * | 1978-10-16 | 1980-11-25 | Mobil Oil Corporation | Treating wells to mitigate flow-after-cementing |
US4917188A (en) * | 1989-01-09 | 1990-04-17 | Halliburton Company | Method for setting well casing using a resin coated particulate |
US6279655B1 (en) * | 1995-01-04 | 2001-08-28 | Schlumberger Technology Corporation | Thixotropic materials |
US6955216B1 (en) * | 1999-11-24 | 2005-10-18 | Shell Oil Company | Device for injecting a fluid into a formation |
US6997252B2 (en) * | 2003-09-11 | 2006-02-14 | Halliburton Energy Services, Inc. | Hydraulic setting tool for packers |
US20060175065A1 (en) * | 2004-12-21 | 2006-08-10 | Schlumberger Technology Corporation | Water shut off method and apparatus |
US20060278391A1 (en) * | 2004-02-02 | 2006-12-14 | Yanmei Li | Hydrogel for use in downhole seal applications |
US7156180B2 (en) * | 2000-10-20 | 2007-01-02 | Schlumberger Technology Corporation | Expandable tubing and method |
US20070137528A1 (en) * | 2003-05-14 | 2007-06-21 | Sylvaine Le Roy-Delage | Self adaptive cement systems |
US7234533B2 (en) * | 2003-10-03 | 2007-06-26 | Schlumberger Technology Corporation | Well packer having an energized sealing element and associated method |
US7243732B2 (en) * | 2003-09-26 | 2007-07-17 | Baker Hughes Incorporated | Zonal isolation using elastic memory foam |
US7255177B2 (en) * | 2003-06-16 | 2007-08-14 | Weatherford/Lamb, Inc. | Tubing expansion |
US20070227733A1 (en) * | 2006-03-29 | 2007-10-04 | Vercaemer Claude J | Method of sealing an annulus surrounding a slotted liner |
US7284603B2 (en) * | 2001-11-13 | 2007-10-23 | Schlumberger Technology Corporation | Expandable completion system and method |
-
2007
- 2007-11-07 US US11/936,278 patent/US20080289812A1/en not_active Abandoned
-
2008
- 2008-03-28 CN CNA2008100858746A patent/CN101498203A/en active Pending
- 2008-04-02 MX MX2008004387A patent/MX2008004387A/en not_active Application Discontinuation
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
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US4235291A (en) * | 1978-10-16 | 1980-11-25 | Mobil Oil Corporation | Treating wells to mitigate flow-after-cementing |
US4917188A (en) * | 1989-01-09 | 1990-04-17 | Halliburton Company | Method for setting well casing using a resin coated particulate |
US6279655B1 (en) * | 1995-01-04 | 2001-08-28 | Schlumberger Technology Corporation | Thixotropic materials |
US6955216B1 (en) * | 1999-11-24 | 2005-10-18 | Shell Oil Company | Device for injecting a fluid into a formation |
US7156180B2 (en) * | 2000-10-20 | 2007-01-02 | Schlumberger Technology Corporation | Expandable tubing and method |
US7185709B2 (en) * | 2000-10-20 | 2007-03-06 | Schlumberger Technology Corporation | Expandable tubing and method |
US7284603B2 (en) * | 2001-11-13 | 2007-10-23 | Schlumberger Technology Corporation | Expandable completion system and method |
US20070137528A1 (en) * | 2003-05-14 | 2007-06-21 | Sylvaine Le Roy-Delage | Self adaptive cement systems |
US7255177B2 (en) * | 2003-06-16 | 2007-08-14 | Weatherford/Lamb, Inc. | Tubing expansion |
US6997252B2 (en) * | 2003-09-11 | 2006-02-14 | Halliburton Energy Services, Inc. | Hydraulic setting tool for packers |
US7243732B2 (en) * | 2003-09-26 | 2007-07-17 | Baker Hughes Incorporated | Zonal isolation using elastic memory foam |
US7234533B2 (en) * | 2003-10-03 | 2007-06-26 | Schlumberger Technology Corporation | Well packer having an energized sealing element and associated method |
US20060278391A1 (en) * | 2004-02-02 | 2006-12-14 | Yanmei Li | Hydrogel for use in downhole seal applications |
US20060175065A1 (en) * | 2004-12-21 | 2006-08-10 | Schlumberger Technology Corporation | Water shut off method and apparatus |
US20070227733A1 (en) * | 2006-03-29 | 2007-10-04 | Vercaemer Claude J | Method of sealing an annulus surrounding a slotted liner |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090038796A1 (en) * | 2007-08-10 | 2009-02-12 | Baker Hughes Incorporated | Expandable leak path preventer in fluid activated downhole tools |
US20120138315A1 (en) * | 2008-09-19 | 2012-06-07 | Swellfix B.V. | Downhole Seal |
US20100212914A1 (en) * | 2009-02-20 | 2010-08-26 | Smith International, Inc. | Hydraulic Installation Method and Apparatus for Installing a Submersible Pump |
US8967256B2 (en) | 2010-01-19 | 2015-03-03 | Halliburton Energy Services, Inc. | Wellbore perforation tool |
US20110174486A1 (en) * | 2010-01-19 | 2011-07-21 | Halliburton Energy Services, Inc. | Wellbore Perforation Tool |
US8356666B2 (en) * | 2010-01-19 | 2013-01-22 | Halliburton Energy Services, Inc | Wellbore perforation tool |
US20110253373A1 (en) * | 2010-04-12 | 2011-10-20 | Baker Hughes Incorporated | Transport and analysis device for use in a borehole |
WO2020223241A1 (en) * | 2019-04-29 | 2020-11-05 | Saudi Arabian Oil Company | Isolation polymer packer |
US11111754B2 (en) | 2019-04-29 | 2021-09-07 | Saudi Arabian Oil Company | Isolation polymer packer |
GB2591247A (en) * | 2020-01-21 | 2021-07-28 | Equinor Energy As | Retrofit expandable annulus sealing (REAS) |
GB2591247B (en) * | 2020-01-21 | 2022-09-14 | Equinor Energy As | Retrofit expandable annulus sealing (REAS) |
US11802232B2 (en) | 2021-03-10 | 2023-10-31 | Saudi Arabian Oil Company | Polymer-nanofiller hydrogels |
US11572761B1 (en) | 2021-12-14 | 2023-02-07 | Saudi Arabian Oil Company | Rigless method for selective zonal isolation in subterranean formations using colloidal silica |
US11708521B2 (en) | 2021-12-14 | 2023-07-25 | Saudi Arabian Oil Company | Rigless method for selective zonal isolation in subterranean formations using polymer gels |
Also Published As
Publication number | Publication date |
---|---|
CN101498203A (en) | 2009-08-05 |
MX2008004387A (en) | 2009-02-27 |
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AS | Assignment |
Owner name: SCHLUMBERGER TECHNOLOGY CORPORATION, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:EL-KHAZINDAR, YASSER MAHMOUD;ROSS, DONALD W.;SHAFIQ, MUHAMMAD;AND OTHERS;REEL/FRAME:020272/0370;SIGNING DATES FROM 20071212 TO 20071214 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |