IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0655322
(2012-10-18)
|
등록번호 |
US-8752630
(2014-06-17)
|
우선권정보 |
GB-0802856.5 (2008-02-15) |
발명자
/ 주소 |
- Swietlik, George
- Large, Robert
|
출원인 / 주소 |
- Pilot Drilling Control Limited
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
74 |
초록
▼
A flow stop valve (20) positionable in a downhole tubular (6), and a method, are provided. The flow stop valve (20) is in a closed position when a pressure difference between fluid outside the downhole tubular (6) and inside the downhole tubular (6) at the flow stop valve (20) is below a threshold v
A flow stop valve (20) positionable in a downhole tubular (6), and a method, are provided. The flow stop valve (20) is in a closed position when a pressure difference between fluid outside the downhole tubular (6) and inside the downhole tubular (6) at the flow stop valve (20) is below a threshold value, thereby preventing flow through the downhole tubular. The flow stop valve (20) is in an open position when the pressure difference between fluid outside the downhole tubular (6) and inside the downhole tubular (6) at the flow stop valve (20) is above a threshold value, thereby permitting flow through the downhole tubular (6).
대표청구항
▼
1. A flow stop valve positionable in a downhole tubular, the flow stop valve comprising: a housing;a valve selectively permitting fluid flow through the flow stop valve, the valve comprising a first valve element and a second valve element movably located within the housing, wherein the first valve
1. A flow stop valve positionable in a downhole tubular, the flow stop valve comprising: a housing;a valve selectively permitting fluid flow through the flow stop valve, the valve comprising a first valve element and a second valve element movably located within the housing, wherein the first valve element is movable with respect to the second valve element; anda first biasing element acting on the valve,wherein the valve is actuated between an open position and a closed position in response to a pressure difference acting on the valve, the pressure difference comprising a difference between a fluid pressure outside of the downhole tubular and a fluid pressure inside of the downhole tubular, or a difference between a fluid pressure at a first, uphole end of the housing and a fluid pressure at a second, downhole end of the housing, or both,wherein the valve is in a closed position when the pressure difference is less than a threshold value and the valve is an open position when the pressure difference is greater than the threshold value,wherein the first biasing element is preloaded by movement of the first and the second valve elements together in response to an increase in the pressure difference in response to lowering the flow stop valve downhole, andwherein the second valve element comprises a port and a passage, the port being in fluidic communication with the passage such that a flow from the first end of the housing to the port is selectively blocked by movement of the second valve element or first valve element, or both, wherein when the valve is in the open position a flow path exists from the first end of the housing, through the port and the passage of the second valve element to the second end of the housing, and wherein, when the valve is in the closed position, the first valve element covers the port of the second valve element, such that the first valve element blocks the flow from the first end of the housing from proceeding to the port. 2. The flow stop valve of claim 1, wherein the valve stays in the closed position during further lowering of the flow stop valve until the pressure difference increases to above the threshold value and the first valve element moves relative to the second valve element. 3. The flow stop valve of claim 1, wherein the first and second valve elements each comprise at least one valve surface, wherein the valve surface of the first valve element and the valve surface of the second valve element are configured to selectively abut one another and prevent flow through the valve. 4. The flow stop valve of claim 1, wherein the flow stop valve further comprises an abutment surface, the abutment surface being configured to limit the travel of the second valve element. 5. The flow stop valve of claim 4, further comprising a spacer element having variable dimensions and configured to adjust a position of the abutment surface such that the limit on the travel of the second valve element can be varied. 6. The flow stop valve of claim 4, further comprising a second biasing element disposed between the abutment surface and the second valve element. 7. The flow stop valve of claim 1, wherein the first biasing element is positioned between an abutment surface of the housing and the first valve element such that the first biasing element resists movement of the first valve element. 8. The flow stop valve of claim 1, wherein the second valve element comprises a piston head provided at a first end of the second valve element. 9. The flow stop valve of claim 8, wherein a projected area of the piston head exposed to the fluid at the first end of the housing is greater than a projected area of the first valve element exposed to the fluid at the first end of the housing. 10. The flow stop valve of claim 1, wherein, when the valve is in the open position, the flow to the port flows radially inward therethrough and to the passage. 11. The flow stop valve of claim 1, wherein, when the valve is in the closed position, the first valve element blocks flow to the port of the second valve element at a point upstream from the port. 12. A flow stop valve positionable in a downhole tubular, comprising: a housing;a valve selectively permitting fluid flow through the flow stop valve, the valve comprising a first valve element and a second valve element movably located within the housing, wherein the first valve element is movable with respect to the second valve element; anda first biasing element acting on the valve,wherein the valve is actuated between an open position and a closed position in response to a pressure difference acting on the valve, the pressure difference comprising a difference between a fluid pressure outside of the downhole tubular and a fluid pressure inside of the downhole tubular, or a difference between a fluid pressure at a first end of the housing and a fluid pressure at a second end of the housing, or both,wherein the valve is in a closed position when the pressure difference is less than a threshold value and the valve is an open position when the pressure difference is greater than the threshold value,wherein the first biasing element is preloaded by movement of the first and the second valve elements together in response to an increase in the pressure difference in response to lowering the flow stop valve downhole,wherein the second valve element comprises a port and a passage, the port being in fluidic communication with the passage such that a flow to the port is selectively blocked by movement of the second valve element or first valve element, or both, wherein when the valve is in the open position a flow path exists from the first end of the housing, through the port and the passage of the second valve element to the second end of the housing, andwherein the first valve element and the housing at least partially define a first chamber, the first chamber being arranged such that when the valve is closed, the first chamber is not in fluidic communication with the second end of the housing. 13. The flow stop valve of claim 12, further comprising a passage provided through the first valve element, the passage providing a flow path from the first end of the housing to the first chamber. 14. The flow stop valve of claim 12, wherein a projected area of the first valve element facing the fluid in the first end of the housing is greater than a projected area of the first valve element facing the fluid in the first chamber. 15. The flow stop valve of claim 12, further comprising a second chamber formed between the first valve element and the housing, the second chamber being sealed from fluidic communication with the first end of the housing and the first chamber. 16. The flow stop valve of claim 15, further comprising a vent formed through a side wall of the housing, the vent providing a flow path between the second chamber and outside the housing. 17. A flow stop valve positionable in a downhole tubular, the flow stop valve comprising: a housing;a valve selectively permitting fluid flow through the flow stop valve, the valve comprising a first valve element and a second valve element movably located within the housing, wherein the first valve element is movable with respect to the second valve element; anda first biasing element acting on the valve,wherein the valve is actuated between an open position and a closed position in response to a pressure difference acting on the valve, the pressure difference comprising a difference between a fluid pressure outside of the downhole tubular and a fluid pressure inside of the downhole tubular, or a difference between a fluid pressure at a first end of the housing and a fluid pressure at a second end of the housing, or both,wherein the valve is in a closed position when the pressure difference is less than a threshold value and the valve is an open position when the pressure difference is greater than the threshold value,wherein the first biasing element is preloaded by movement of the first and the second valve elements together in response to an increase in the pressure difference in response to lowering the flow stop valve downhole,wherein the first valve element and the housing at least partially define a first chamber, the first chamber being arranged such that when the valve is closed, the first chamber is not in fluidic communication with the second end of the housing, andwherein the flow stop valve further comprising a second chamber formed between the first valve element and the housing, the second chamber being sealed from fluidic communication with the first end of the housing and the first chamber. 18. The flow stop valve of claim 17, further comprising a vent formed through a side wall of the housing, the vent providing a flow path between the second chamber and outside the housing.
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