Downhole hydraulic control system with failsafe features
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0522598
(2006-09-18)
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등록번호 |
US-7694742
(2010-05-20)
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발명자
/ 주소 |
- Bane, Darren E.
- Anderson, David Z.
- Jackson, Aaron T.
- Beall, Clifford H.
- Welch, Jr., Edward W.
- Wagner, Alan N.
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출원인 / 주소 |
- Baker Hughes Incorporated
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
7 인용 특허 :
10 |
초록
▼
A control system for a subsurface safety valve addresses normal open and closed operation and a failsafe operation if key system components fail. It features a single control line from the surface that splits at the subsurface safety valve and goes to one end of two discrete piston chambers that are
A control system for a subsurface safety valve addresses normal open and closed operation and a failsafe operation if key system components fail. It features a single control line from the surface that splits at the subsurface safety valve and goes to one end of two discrete piston chambers that are aligned and isolated from tubing pressure. The piston in one chamber is larger than in the other and the pistons are connected for tandem movement. Each side of the unbalanced system's piston has a seal mounted to it and another for the rod attached to it that exits the chamber. A jumper line connects the chambers at a point between the seals in each chamber and features a large reservoir. The jumper line is filled with a compressible fluid. Fail safe closure of the valve occurs if any of the four seals fail.
대표청구항
▼
We claim: 1. In a downhole tubing mounted tool having a controlled element, the improvement comprising: a single control line running downhole and branching to selectively deliver control line pressure to opposed ends of at least one pair of pistons connected to each other, said pressure delivered
We claim: 1. In a downhole tubing mounted tool having a controlled element, the improvement comprising: a single control line running downhole and branching to selectively deliver control line pressure to opposed ends of at least one pair of pistons connected to each other, said pressure delivered in opposed directions to said pistons from said branching lines and wherein said pistons move at the same time for movement of the controlled element that can be repeated in at least a first direction. 2. The tool of claim 1, wherein: said pistons move in tandem in a second direction opposite said first direction. 3. The tool of claim 2, wherein: said pistons are of different sizes. 4. The tool of claim 1, wherein: said pistons each comprise a piston seal and are disposed in discrete housings configured to put said pistons in pressure balance if either of said piston seals fail. 5. The tool of claim 1, wherein: said pistons are disposed in discrete housings and further comprise connecting members that extend from the respective housing for connection between said housings. 6. The tool of claim 5, wherein: said connecting members are aligned and said pistons are of different sizes. 7. The tool of claim 1, wherein: said tool comprises a subsurface safety valve and said controlled element comprises a biased flow tube movable by said pistons to open a flapper. 8. In a downhole tubing mounted tool having a controlled element, the improvement comprising: a single control line running downhole and branching to selectively deliver control line pressure to at least one pair of pistons that move in tandem for movement of the controlled element in at least a first direction; said pistons move in tandem in a second direction opposite said first direction; said pistons are of different sizes; said pistons are disposed in discrete housings with each piston having a connecting member extending out of said housing so that the connecting members can be connected outside said housings. 9. The tool of claim 8, wherein: the larger piston comprises a piston seal and a spaced connecting member seal, said larger piston seal divides a first housing into a large piston higher and a lower pressure chamber and said larger piston connecting member seal excludes tubing pressure from said larger piston lower pressure chamber; the smaller piston comprises a piston seal and a spaced connecting member seal, said smaller piston ring seal divides a second housing into a smaller piston higher and a lower pressure chamber and said smaller piston connecting member seal excludes tubing pressure from said smaller piston lower pressure chamber. 10. The tool of claim 5, wherein: said lower pressure chambers are in fluid communication. 11. The tool of claim 10, wherein: said fluid communication further comprises a reservoir volume sized to reduce pressure buildup from lower pressure chamber volume reduction due to piston movement. 12. The tool of claim 11, wherein: said reservoir contains a compressible fluid. 13. The tool of claim 10, wherein: said higher pressure chambers are in fluid communication with said control line. 14. The tool of claim 13, wherein: failure of either piston seal puts both said pistons in pressure balance to distance said pistons from the controlled element. 15. The tool of claim 13, wherein: failure of either connecting member seal, causing leakage from the tubing, creates a net force on said pistons from tubing pressure to distance said pistons from the controlled element. 16. The tool of claim 15, wherein: said net force results from tubing pressure migrating into said lower pressure chambers upon a failure of a connecting member seal. 17. The tool of claim 15, wherein: said tool comprises a subsurface safety valve and said controlled element comprises a biased flow tube movable by said pistons to open a flapper. 18. The tool of claim 9, wherein: said tool comprises a subsurface safety valve and said controlled element comprises a biased flow tube movable by said pistons to open a flapper. 19. The tool of claim 8, wherein: said connecting members are balanced from the effect of tubing pressure. 20. The tool of claim 8, wherein: said connecting members are unitary outside said housings. 21. The tool of claim 8, wherein: said connection members are connected by a connection outside said housings. 22. The tool of claim 8, wherein: said connecting members are either aligned or misaligned. 23. In a downhole tubing mounted tool having a controlled element, the improvement comprising: a single control line running downhole and branching to selectively deliver control line pressure to at least one pair of pistons that move in tandem for movement of the controlled element in at least a first direction; said pistons each comprise a piston seal and are disposed in discrete housings configured to put said pistons in pressure balance if either of said piston seals fail; said pistons are linked through connecting members that extend from each piston and out of said housings, each connecting member further comprising a connecting member seal where a said connecting member exits a housing to exclude tubing pressure, whereupon failure of either of said connecting member seals a net force from tubing pressure acts on said pistons to distance said pistons from said controlled element. 24. The tool of claim 23, wherein: said pistons are of different sizes. 25. The tool of claim 24, wherein: each piston divides its housing into a higher pressure chamber in fluid communication with the control line and a lower pressure chamber, said lower pressure chambers in communication with each other. 26. The tool of claim 25, wherein: said lower pressure chambers contain a compressible fluid at a pressure substantially lower than hydrostatic pressure in said control line. 27. The tool of claim 26, wherein: said fluid communication between said chambers comprises a reservoir having a larger volume than said lower pressure chambers. 28. The tool of claim 23, wherein: said tool comprises a subsurface safety valve and said controlled element comprises a biased flow tube movable by said pistons to open a flapper. 29. In a downhole tubing mounted tool having a controlled element, the improvement comprising: a single control line running downhole and branching to selectively deliver control line pressure to at least one pair of pistons that move in tandem for movement of the controlled element in at least a first direction; said pistons are in discrete housings and each have one side in fluid communication to said control line and an opposite side pressure balanced to exposure to tubing pressure.
이 특허에 인용된 특허 (10)
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Lauderdale,Donald Powell; Smith,Roddie R.; Gledhill,Richard, Balance line safety valve with tubing pressure assist.
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Clifford H. Beall ; Brian S. Shaw, Control system for deep set subsurface valves.
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Sloan, James T., Control system with failsafe feature in the event of tubing rupture.
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Beall Clifford H., Failsafe control system for a subsurface safety valve.
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Deaton Thomas M., Failsafe safety valve and method.
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Amani Mahmood (P.O. Box 8584 Wichita KS 67208), Liquid removal method system and apparatus for hydrocarbon producing.
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Klemm, Guenter, Method for performing ground or rock work and hydraulic percussion device.
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Craig Gene C. (Houston TX), Pressure operated test tool.
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McCalvin, David E.; Deaton, Thomas M., Subsurface safety valve.
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Pringle Ronald E., Variable orifice gas lift valve assembly for high flow rates with detachable power source and method of using same.
이 특허를 인용한 특허 (7)
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Williams, Ronald, Failsafe hydrostatic vent.
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Lake, Gary Benjamin, Failsafe subsurface controlled safety valve.
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Smith, Roddie R.; Williams, Ronald D.; Wojciechowski, Robert, Multiple control line assembly for downhole equipment.
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Scott, Bruce Edward, Multiple piston pressure intensifier for a safety valve.
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Davis, Glenn Ray; Scott, Bruce Edward; Vick, Jr., James Dan, Pipe swell powered tool.
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Vick, Jr., James Dan, Stacked piston safety valve with different piston diameters.
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Bussear, Terry R., Thermo-hydraulically actuated process control valve.
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