[특허]Centralizers for oil well casings

[미국특허] Centralizers for oil well casings 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-017/10
출원번호	US-0910135 (1992-08-06)
우선권정보	GB-0001007 (1990-01-17); DE-4024000 (1990-07-28)
국제출원번호	PCT/GB91/00065 (1991-01-17)
§371/§102 date	19920806 (19920806)
국제공개번호	WO-9110806 (1991-07-25)
발명자 / 주소	Gullet Paul D. (Grantham GB3) Jansch Manfred (Garbsen DEX)
출원인 / 주소	Weatherford U.K. Limited (GBX 03)
인용정보	피인용 횟수 : 60 인용 특허 : 0

초록 ▼

A centralizer for well casings is disclosed which, in one aspect has spring strips which are normally bowed to centralize the casing, but which are held in a collapsed disposition against the casing while the casing is positioned in a borehole. The holding force may be provided by a band and/or an arrangement of struts which are released when the casing is positioned. An additional energizing device may be provided to increase the bowing of the spring strips for more certain engagement with the surrounding borehole.

대표청구항 ▼

A centralizer for well casings, said centralizer comprising, a mounting means by which the centralizer may be mounted on an outer surface of a casing, a plurality of members carried by the mounting means at spaced positions therearound, the members held by a control device in a collapsed position in which the members extend along said casing closely adjacent said outer surface thereof, said control device actuatable so that the members move from said collapsed position to a deployed position in which the members extend away from said mounting means for engagement with an associated borehole, and said control device is actuable when said casing is disposed in said borehole, said control device disposable wholly radially outwardly or wholly radially inwardly of said casing, each member resiliently biased towards said deployed position, the control device holding the members in said collapsed position, each member comprising a spring strip whose inherent resilience provides resilient bias to bias each member toward said deployed position, the mounting means including two spaced annular sleeves, the ends of each spring strip connected to respective sleeves so that, in said deployed position, the spring strips bow outwardly between said sleeves, and the control device comprising a band extending around said spring strips and holding said spring strips in said collapsed position against said resilient bias, said band releasable to allow movement of said spring strips to said deployed position.

이 특허를 인용한 특허 (60) 인용/피인용 타임라인 분석

Reid, Steve, Activation device.
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Buytaert, Jean; Miller, Eugene Edward, Apparatus for and method of deploying a centralizer installed on an expandable casing string.
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Buytaert, Jean; Miller, Eugene Edward; Hining, Ira Eugene, Apparatus for securing a centralizer to a tubular.
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Bingamon, Arlen Earl; Morrical, Stephen C.; Innis, Francis Allison; Sorcic, Anthony Martin, Cementitious compositions for oil well cementing applications.
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Bingamon,Arlen Earl; Morrical,Stephen C.; Innis,Francis Allison; Sorcic,Anthony Martin, Cementitious compositions for oil well cementing applications.
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MacLeod, Iain, Centraliser.
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MacLeod, Iain, Centraliser.
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Reid, Steve, Centraliser.
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Stokka Arnold (Sandnes NOX), Centralisers.
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Barger, Troy, Centralized stop collar for floating centralizer.
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Lirette Brent J. (Houma LA) Vilyus Robert P. (Houma LA) Martens James G. (Houma LA) Hebert Brad W. (Houma LA), Centralizer.
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Morrison, Jeffery; Lirette, Brent J.; LoGiudice, Michael; Smith, Paul L., Centralizer.
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Kiess, Christian; Krieger, Sebastian F., Centralizer with integrated stop collar.
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Jewett, Scott E.; Duckworth, David G., Centralizers for centralizing well casings.
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Robertson, Michael C., Consumable downhole tool.
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Clayton, Robert P.; Berscheidt, Kevin; Robertson, Michael C., Consumable downhole tools.
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Clayton, Robert Preston; Berscheidt, Kevin; Robertson, Michael C., Consumable downhole tools.
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Swor, Loren C.; Wilkinson, Brian K.; Robertson, Michael C., Consumable downhole tools.
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Swor, Loren Craig; Wilkinson, Brian Keith, Consumable downhole tools.
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Grubelich, Mark C.; Su, Jiann-Cherng; Knudsen, Steven D., Deployable centralizers.
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Starr,Philip M.; Swor,Loren C.; Folds,Don S., Dissolvable downhole tools.
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Buytaert, Jean; Miller, Eugene, Downhole device actuator and method.
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Gremillion,Maximillian S., Dual diameter and rotating centralizer/sub.
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Gremillion, Maximillian S., Dual diameter and rotating centralizer/sub and method.
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Gremillion,Maximillian S., Dual diameter and rotating centralizer/sub and method.
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Gremillion,Maximillian S., Dual diameter and rotating centralizer/sub and method.
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Wittle, J. Kenneth; Harrison, James, Electrical jumper for a producing oil well.
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Buytaert, Jean; Miller, Eugene Edward; McDowell, Donald Elwin, Expandable centralizer for expandable pipe string.
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Buytaert, Jean; Miller, Eugene Edward; McDowell, Donald Elwin, Expandable centralizer for expandable pipe string.
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Buytaert, Jean; Miller, Eugene Edward; McDowell, Donald Elwin, Expandable centralizer for expandable pipe string.
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Guerrero, Julio C.; Munro, Logan; Wicks, Nathan; Robisson, Agathe, Expandable structure for deployment in a well.
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Budde Peter (Vlaardingen NLX), Fill valve.
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John D. Roberts ; James Longbottom ; David M. Haugen ; Alex Dawson GB; David Duguid GB; Frank Middleton SA; Brian Bingham ; Todd Horst, In-tubing wellbore sidetracking operations.
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Vaeth, John; Molaison, Dennis; Shaposhnikov, Pavel; Babin, Chris, Instrument centralizer configurable for use with cement evaluation well logging instruments.
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Buytaert, Jean; Miller, Eugene Edward; Young, Jimmy Mack, Low clearance centralizer.
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Buytaert, Jean; Miller, Eugene Edward; Young, Jimmy Mack, Low clearance centralizer and method of making centralizer.
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McDaniel, Troy; Buytaert, Jean; Miller, Eugene Edward, Low-clearance centralizer.
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Bousche,Olaf Jean Paul; Runia,Douwe Johannes, Method and system for reducing longitudinal fluid flow around a permeable well.
상세보기
Robertson, Michael C., Method for removing a consumable downhole tool.
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Swor, Loren C.; Starr, Phillip M.; Smith, Don R.; Wilkinson, Brian K., Method for removing a consumable downhole tool.
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Tilghman, Stephen E., Method for removing a sealing plug from a well.
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Buytaert, Jean, Minimum clearance bow-spring centralizer.
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Macleod, Iain; Reid, Steve, Packer.
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Mercer, Lee; MacLeod, Iain, Packer.
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Mercer, Lee; Macleod, Iain, Packer.
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Purkis, Daniel, Plug.
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Levie, William Iain Elder; Roger, Gregory Paul; Sweep, Miles Norman, Pull through centralizer.
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Levie, William Iain Elder; Roger, Gregory Paul; Sweep, Miles Norman, Pull through centralizer.
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Purkis, Daniel, Running adapter.
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McLeod, Iain; Mercer, Lee, Sealing system.
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Guerrero, Julio C.; Munro, Logan, System and methods for actuating reversibly expandable structures.
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Guerrero, Julio C.; Munro, Logan, System and methods for actuating reversibly expandable structures.
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Purkis, Daniel, Tree plug.
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Garner, Stephen Randall, Tubing centralizer.
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Elrick, Andrew, Tubing section.
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Elrick, Andrew John; Reid, Steven, Tubing section coupling.
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Budde Peter,NLX, Valve for wellbore use.
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Jordan, J. Christopher; Martens, James G.; Arcement, Jeffrey J.; Mondelli, Juan Carlos E.; Hebert, John E.; Scott, Scottie J.; Dupre′, Thomas A., Well centralizer.
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Jordan, J. Christopher; Martens, James G.; Arcement, Jeffrey J.; Mondelli, Juan Carlos; Hebert, John E.; Scott, Scottie J.; Dupre', Thomas A., Well centralizer.
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Giroux Richard L. ; Budde Peter,NLX, Wellbore valve.
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[미국특허] Centralizers for oil well casings 원문보기