EP1759086B1 - Sieb zur steuerung der sandproduktion in einem bohrloch - Google Patents

Sieb zur steuerung der sandproduktion in einem bohrloch Download PDF

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Publication number
EP1759086B1
EP1759086B1 EP05754205A EP05754205A EP1759086B1 EP 1759086 B1 EP1759086 B1 EP 1759086B1 EP 05754205 A EP05754205 A EP 05754205A EP 05754205 A EP05754205 A EP 05754205A EP 1759086 B1 EP1759086 B1 EP 1759086B1
Authority
EP
European Patent Office
Prior art keywords
rubber
wellbore
swelling
screen
conduit
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.)
Active
Application number
EP05754205A
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English (en)
French (fr)
Other versions
EP1759086A1 (de
Inventor
Matheus Norbertus Baaijens
Erik Kerst Cornelissen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Publication date
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP05754205A priority Critical patent/EP1759086B1/de
Publication of EP1759086A1 publication Critical patent/EP1759086A1/de
Application granted granted Critical
Publication of EP1759086B1 publication Critical patent/EP1759086B1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/08—Screens or liners
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells

Definitions

  • the outer layer with the filter included is biased against the wellbore wall. Solid particles which locally enter the wellbore are thereby prevented from flowing in longitudinal direction along the entire screen so that the risk of plugging of the entire filter as a result of local inflow of solids is eliminated. Furthermore, the expanded outer layer supports the wellbore wall so that sand failure at the wellbore wall is largely reduced. Moreover the expanded outer layer provides a large inflow area for the screen.
  • the swelling means includes a sleeve extending around the conduit, the sleeve being provided with a plurality of through-openings spaced along the sleeve, for example through-opening having a substantially rectangular shape or a substantially circular shape.
  • Fig. 1 is shown the wellbore screen 1 before swelling of the rings 6 upon contact with produced hydrocarbon fluid, so that the outer layer 4 is in its unexpanded state whereby a clearance 11 exists between the shroud 4b and the wellbore wall.
  • FIG. 4 there is shown the wellbore screen 1 and wellbore 2 in cross-section after swelling of the rings 6.
  • the outer layer 4 has been expanded against the wellbore wall, whereby during expansion of the filter layer 4a sliding of adjacent filter sheets 5 relative each other has occurred, and whereby during expansion of the shroud 4b widening of the slots of the shroud 4b has occurred.
  • the wellbore screen 1 is lowered into the wellbore 2 and positioned in the hydrocarbon fluid bearing zone of the surrounding formation, whereby the rings 6 are in their respective un-swollen state and the clearance 11 is present between the outer layer 4 and the wall of the wellbore 2 ( Fig. 1 ).
  • a stream of crude oil flows from the surrounding formation into the wellbore 2 and from there via the outer layer 4 and the perforations 7 into the tubular member 3.
  • the stream of hydrocarbon fluid flows along the rings 6 which thereby swell from their unexpanded state ( Fig. 1 ) to their expanded state ( Fig. 2 ).
  • accelerated swelling of the rings 6 can be achieved by pumping diesel, or any other suitable fluid, into the wellbore 2 before the well is taken in production.
  • the stream of hydrocarbon fluid is prevented from flowing in axial direction along the outside of the outer layer 4 so that sand or clay particles which may have locally entered into the stream of hydrocarbon fluid, are prevented from flowing in longitudinal direction along the entire outer layer 4.
  • sand or clay particles which may have locally entered into the stream of hydrocarbon fluid
  • any other suitable shroud can be used, for example a foldable shroud provided with hinges to allow unfolding of the shroud, or a shroud formed of a plurality of interconnected small tubulars whereby the individual tubulars become flattened upon expansion of the shroud.

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  • 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)
  • Filtering Materials (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Claims (11)

  1. Bohrlochfilter zum Steuern des Einströmens von Feststoffteilchen in ein Bohrloch, wobei der Bohrlochfilter (1) eine Leitung (3) für den Fluidtransport aufweist, eine äußere Lage (4), die einen Filter (4a) zum Reduzieren des Einströmens von Feststoffteilchen in die Leitung (3) aufweist, wobei sich die äußere Lage (4) um die Leitung (3) erstreckt und radial expandierbar ist, und Schwellmittel (6), die befähigt sind, bei Kontakt mit einem vorbestimmten Fluid anzuschwellen, dadurch gekennzeichnet, daß die äußere Lage (4) radial gegen die Bohrlochwand (2) expandierbar ist, daß die Schwellmittel (6) zwischen der Leitung (3) und der äußeren Lage (4) angeordnet sind, und daß das Schwellen der Schwellmittel (6) derart erfolgt, daß sie die äußere Lage (4) radial gegen die Bohrlochwand expandieren.
  2. Bohrlochfilter nach Anspruch 1, bei welchem die Schwellmittel (6) eine Vielzahl von Schwellringen (6) aufweisen, wobei sich jeder Ring um die Leitung (3) erstreckt und bei Kontakt mit einem vorbestimmten Fluid anschwillt, wobei die Ringe (6) entlang der Leitung gegenseitigen Abstand haben.
  3. Bohrlochfilter nach Anspruch 2, bei welchem die Ringe (6) in gleichmäßigen gegenseitigen Abständen entlang der Leitung (3) angeordnet sind.
  4. Bohrlochfilter nach Anspruch 1, bei welchem die Schwellmittel (6) eine Umhüllung aufweisen, die sich um die Leitung (3) erstreckt, wobei die Umhüllung mit einer Vielzahl von Durchtrittsöffnungen versehen ist, die entlang der Umhüllung beabstandet sind.
  5. Bohrlochfilter nach Anspruch 4, bei welchem jede Durchtrittsöffnung im wesentlichen rechteckige Gestalt oder im wesentlichen kreisförmige Gestalt hat.
  6. Bohrlochfilter nach einem der Ansprüche 1-5, bei welchem die Schwellmittel (6) ein Material aufweisen, das befähigt ist, bei Kontakt mit Kohlenwasserstofffluid oder Wasser anzuschwellen.
  7. Bohrlochfilter nach Anspruch 6, bei welchem das Material bei Kontakt mit Wasser anschwillt und einen Gummi enthält, der aus Nitrilbutadiengummi, hydriertem Nitrilbutadien-gummi, carboxyliertem Nitrilbutadiengummi, Fluorpolymer, Tetrafluorethylen/Polypropylen, Ethylen-Propylen-Dienterpolymergummi, Chloroprengummi, chlorsulfoniertem Polyethylen, chloriertem Polyethylen und Polyurethangummi gewählt ist.
  8. Bohrlochfilter nach Anspruch 6, bei welchem das Material bei Kontakt mit Kohlenwasserstofffluid anschwillt und einen Gummi enthält, der aus Naturkautschuk, Acrylatbutadiengummi, Butylgummi, bromiertem Butylgummi, chlorier- tem Butylgummi, chloriertem Polyethylen, Chloroprengummi, Styrolbutadiengummi, sulfoniertem Polyethylen, Ethylen-acrylatgummi, Epichlorhydrin-Ethylenoxid-Copolymer, Epi-chlorhydrin-Ethylenoxid-Terpolymer, Ethylen-Propylen-Copolymer (peroxidvernetzt), Ethylen-Propylen-Dienterpolymergummi und Silikongummi gewählt ist.
  9. Bohrlochfilter nach Anspruch 8, bei welchem das Material aus Ethylen-Propylen-Copolymer (peroxidvernetzt), Ethylen-Propylen-Dienterpolymergummi, Butylgummi, bromiertem Butylgummi, chloriertem Butylgummi und chloriertem Polyethylen gewählt ist.
  10. Bohrlochfilter nach einem der Ansprüche 1-9, bei welchem die äußere Lage (4) eine ringförmige Filterlage (4a) und eine ringförmige Abschirmung (4b) umfaßt, die sich um die ringförmige Filterlage (4a) erstreckt.
  11. Bohrlochfilter nach einem der Ansprüche 1-10, bei welchem das Bohrloch ein Bohrloch zur Förderung von Kohlenwasserstofffluid oder Wasser aus der Erdformation ist.
EP05754205A 2004-06-25 2005-06-23 Sieb zur steuerung der sandproduktion in einem bohrloch Active EP1759086B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05754205A EP1759086B1 (de) 2004-06-25 2005-06-23 Sieb zur steuerung der sandproduktion in einem bohrloch

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04253821 2004-06-25
EP05754205A EP1759086B1 (de) 2004-06-25 2005-06-23 Sieb zur steuerung der sandproduktion in einem bohrloch
PCT/EP2005/052947 WO2006003112A1 (en) 2004-06-25 2005-06-23 Screen for controlling sand production in a wellbore

Publications (2)

Publication Number Publication Date
EP1759086A1 EP1759086A1 (de) 2007-03-07
EP1759086B1 true EP1759086B1 (de) 2009-07-29

Family

ID=34930436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05754205A Active EP1759086B1 (de) 2004-06-25 2005-06-23 Sieb zur steuerung der sandproduktion in einem bohrloch

Country Status (12)

Country Link
US (1) US20080283240A1 (de)
EP (1) EP1759086B1 (de)
CN (1) CN100575660C (de)
AU (1) AU2005259247B2 (de)
BR (1) BRPI0512375A (de)
CA (1) CA2569789A1 (de)
DE (1) DE602005015710D1 (de)
EA (1) EA009188B1 (de)
EG (1) EG24909A (de)
MY (1) MY142386A (de)
NO (1) NO20070463L (de)
WO (1) WO2006003112A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8291972B2 (en) 2008-08-29 2012-10-23 Halliburton Energy Services, Inc. Sand control screen assembly and method for use of same

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2530995C (en) 2004-12-21 2008-07-15 Schlumberger Canada Limited System and method for gas shut off in a subterranean well
CA2530969C (en) 2004-12-21 2010-05-18 Schlumberger Canada Limited Water shut off method and apparatus
CN101175893B (zh) * 2005-04-13 2013-06-19 贝克休斯公司 自适应筛管
US7708068B2 (en) 2006-04-20 2010-05-04 Halliburton Energy Services, Inc. Gravel packing screen with inflow control device and bypass
US8453746B2 (en) 2006-04-20 2013-06-04 Halliburton Energy Services, Inc. Well tools with actuators utilizing swellable materials
US7802621B2 (en) 2006-04-24 2010-09-28 Halliburton Energy Services, Inc. Inflow control devices for sand control screens
US7469743B2 (en) 2006-04-24 2008-12-30 Halliburton Energy Services, Inc. Inflow control devices for sand control screens
US7661481B2 (en) * 2006-06-06 2010-02-16 Halliburton Energy Services, Inc. Downhole wellbore tools having deteriorable and water-swellable components thereof and methods of use
GB2444060B (en) * 2006-11-21 2008-12-17 Swelltec Ltd Downhole apparatus and method
WO2008097312A1 (en) 2007-02-06 2008-08-14 Halliburton Energy Services, Inc. Swellable packer with enhanced sealing capability
GB2448298B (en) 2007-04-10 2009-12-23 Swelltec Ltd Downhole apparatus and method
EP2229500A1 (de) * 2007-06-21 2010-09-22 Swelltec Limited Vorrichtung und verfahren mit einem in kohlenwasserstoff und in wasser quellbaren körper
US9004155B2 (en) 2007-09-06 2015-04-14 Halliburton Energy Services, Inc. Passive completion optimization with fluid loss control
CN101126311B (zh) * 2007-09-19 2013-09-18 刘文西 石油水平井膨胀防砂筛管装置和膨胀工艺方法
GB2455807B (en) 2007-12-22 2012-08-22 Weatherford Lamb Isolating tubing
US7712529B2 (en) 2008-01-08 2010-05-11 Halliburton Energy Services, Inc. Sand control screen assembly and method for use of same
US7703520B2 (en) 2008-01-08 2010-04-27 Halliburton Energy Services, Inc. Sand control screen assembly and associated methods
US7931092B2 (en) 2008-02-13 2011-04-26 Stowe Woodward, L.L.C. Packer element with recesses for downwell packing system and method of its use
US7994257B2 (en) 2008-02-15 2011-08-09 Stowe Woodward, Llc Downwell system with swellable packer element and composition for same
US7866383B2 (en) 2008-08-29 2011-01-11 Halliburton Energy Services, Inc. Sand control screen assembly and method for use of same
US7841409B2 (en) * 2008-08-29 2010-11-30 Halliburton Energy Services, Inc. Sand control screen assembly and method for use of same
US7984762B2 (en) * 2008-09-25 2011-07-26 Halliburton Energy Services, Inc. Pressure relieving transition joint
US8256510B2 (en) 2009-08-12 2012-09-04 Halliburton Energy Services, Inc. Control screen assembly
US8302680B2 (en) * 2009-08-12 2012-11-06 Halliburton Energy Services, Inc. Swellable screen assembly
US20110120733A1 (en) 2009-11-20 2011-05-26 Schlumberger Technology Corporation Functionally graded swellable packers
US8291976B2 (en) 2009-12-10 2012-10-23 Halliburton Energy Services, Inc. Fluid flow control device
US9353608B2 (en) 2010-03-18 2016-05-31 Statoil Petroleum As Flow control device and flow control method
US20120168181A1 (en) * 2010-12-29 2012-07-05 Baker Hughes Incorporated Conformable inflow control device and method
US20130269942A1 (en) 2010-12-31 2013-10-17 Shell Internationale Research Maatschappij B.V. Method and system for sealing a void in an underground wellbore
US9695654B2 (en) 2012-12-03 2017-07-04 Halliburton Energy Services, Inc. Wellhead flowback control system and method
US9127526B2 (en) 2012-12-03 2015-09-08 Halliburton Energy Services, Inc. Fast pressure protection system and method
US11713671B2 (en) 2014-10-28 2023-08-01 Halliburton Energy Services, Inc. Downhole state-machine-based monitoring of vibration
US10450843B2 (en) 2016-06-06 2019-10-22 Baker Hughes, A Ge Company, Llc Screen assembly for a resource exploration system
US10563486B2 (en) 2016-06-06 2020-02-18 Baker Hughes, A Ge Company, Llc Screen assembly for a resource exploration system
CN106928947B (zh) * 2017-03-28 2022-11-15 北京华油油气技术开发有限公司 一种套管间环空的封堵材料、封堵装置和封堵方法
MX2019011243A (es) * 2017-05-01 2019-10-21 Halliburton Energy Services Inc Biflex con lineas de flujo.
US20190169963A1 (en) * 2017-12-04 2019-06-06 Baker Hughes, A Ge Company, Llc Selectively expandable screen for a resource exploration and recovery system
CN112228014A (zh) * 2020-11-03 2021-01-15 山东普瑞思德石油技术有限公司 一种抗堵控水筛管
CN114034571B (zh) * 2021-11-04 2023-06-09 中国石油大学(华东) 一种模拟油井动态出砂与固相控制的实验装置及方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099318A (en) * 1961-01-23 1963-07-30 Montgomery K Miller Well screening device
US6634431B2 (en) * 1998-11-16 2003-10-21 Robert Lance Cook Isolation of subterranean zones
WO2000045031A1 (en) * 1999-01-29 2000-08-03 Schlumberger Technology Corporation Controlling production
EP1301686B1 (de) * 2000-07-21 2005-04-13 Sinvent AS Kombinierte verrohrung und sandfilter
GB2388136B (en) * 2001-01-26 2005-05-18 E2Tech Ltd Device and method to seal boreholes
US6571871B2 (en) * 2001-06-20 2003-06-03 Weatherford/Lamb, Inc. Expandable sand screen and method for installing same in a wellbore
US7644773B2 (en) * 2002-08-23 2010-01-12 Baker Hughes Incorporated Self-conforming screen
US6769484B2 (en) * 2002-09-03 2004-08-03 Jeffrey Longmore Downhole expandable bore liner-filter
AU2003264283A1 (en) 2002-09-06 2004-03-29 Shell Internationale Research Maatschappij B.V. Wellbore device for selective transfer of fluid
US6834725B2 (en) * 2002-12-12 2004-12-28 Weatherford/Lamb, Inc. Reinforced swelling elastomer seal element on expandable tubular
US7527099B2 (en) * 2003-07-29 2009-05-05 Shell Oil Company System for sealing a space in a wellbore
GB2428264B (en) * 2004-03-12 2008-07-30 Schlumberger Holdings Sealing system and method for use in a well
EA009070B1 (ru) * 2004-06-25 2007-10-26 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Экран для управления притоком твердых частиц в ствол скважины
US7441596B2 (en) * 2006-06-23 2008-10-28 Baker Hughes Incorporated Swelling element packer and installation method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8291972B2 (en) 2008-08-29 2012-10-23 Halliburton Energy Services, Inc. Sand control screen assembly and method for use of same
US8499827B2 (en) 2008-08-29 2013-08-06 Halliburton Energy Services, Inc. Sand control screen assembly and method for use of same

Also Published As

Publication number Publication date
WO2006003112A1 (en) 2006-01-12
US20080283240A1 (en) 2008-11-20
CN1973111A (zh) 2007-05-30
EA200700123A1 (ru) 2007-04-27
EA009188B1 (ru) 2007-12-28
EP1759086A1 (de) 2007-03-07
DE602005015710D1 (de) 2009-09-10
AU2005259247A1 (en) 2006-01-12
MY142386A (en) 2010-11-30
NO20070463L (no) 2007-03-23
BRPI0512375A (pt) 2008-03-11
CN100575660C (zh) 2009-12-30
AU2005259247B2 (en) 2008-09-18
EG24909A (en) 2010-12-15
CA2569789A1 (en) 2006-01-12

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