Stacked piston safety valves and related methods
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-034/10
E21B-034/00
출원번호
US-0407767
(2012-07-30)
등록번호
US-10041330
(2018-08-07)
국제출원번호
PCT/US2012/048821
(2012-07-30)
§371/§102 date
20150320
(20150320)
국제공개번호
WO2014/021816
(2014-02-06)
발명자
/ 주소
Vick, Jr., James D.
출원인 / 주소
Halliburton Energy Services, Inc.
대리인 / 주소
McDermott Will & Emery LLP
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
Disclosed is a safety valve with redundant operators or systems. One safety valve includes a piston bore in fluid communication with a first control line via first control line port and a second control line via a second control line port, the first and second control lines conveying hydraulic fluid
Disclosed is a safety valve with redundant operators or systems. One safety valve includes a piston bore in fluid communication with a first control line via first control line port and a second control line via a second control line port, the first and second control lines conveying hydraulic fluid pressure to the piston bore. First and second piston assemblies are movably arranged within the piston bore and the second piston assembly includes a transition member coupled thereto. A flow tube is arranged adjacent the transition member and moves axially within a flow passage defined in the safety valve in response to the movement of the transition member. A valve closure device moves between an open position and a closed position restricts fluid flow through the flow passage when in the closed position, the flow tube being adapted to shift the valve closure device between open and closed positions.
대표청구항▼
1. A safety valve, comprising: a piston bore defined within a housing that defines a first control line port for communicably coupling a first control line to the piston bore and a second control line port for communicably coupling a second control line to the piston bore, wherein the first and seco
1. A safety valve, comprising: a piston bore defined within a housing that defines a first control line port for communicably coupling a first control line to the piston bore and a second control line port for communicably coupling a second control line to the piston bore, wherein the first and second control lines are independent from each other to independently convey hydraulic fluid pressure to the piston bore;a first piston assembly actuatable by at least one of the first and second control lines, and movably arranged within the piston bore;a second piston assembly actuatable by at least one of the first and second control lines independently from the first piston assembly, movably arranged within the piston bore, and axially spaced from the first piston assembly, the second piston assembly including a transition member arranged at a distal end thereof;a flow tube coupled to the transition member and configured to move axially within a flow passage defined in the safety valve in response to movement of the transition member; anda valve closure device movable between an open position and a closed position and adapted to restrict fluid flow through the flow passage when in the closed position, wherein the flow tube is adapted to shift the valve closure device between open and closed positions. 2. The safety valve of claim 1, wherein the piston bore defines an up stop configured to bias the first piston assembly when the first piston assembly is forced toward the first control line port. 3. The safety valve of claim 2, wherein engagement between the up stop and the first piston assembly generates a mechanical seal therebetween. 4. The safety valve of claim 1, further comprising one or more dynamic seals arranged about the first and/or the second piston assemblies. 5. The safety valve of claim 1, further comprising a spring arranged within the piston bore and configured to bias the second piston assembly upwardly within the piston bore. 6. The safety valve of claim 1, wherein the first control line port provides hydraulic fluid pressure via the first control line that forces the first piston assembly downward within the piston bore which thereby biases the second piston assembly downward within the piston bore. 7. The safety valve of claim 1, wherein the second control line port provides hydraulic fluid pressure via the second control line that forces the first piston assembly toward the first control line port and forces the second piston assembly downward within the piston bore. 8. The safety valve of claim 1, further comprising a down/up stop seat arranged within the piston bore and providing an up stop at a lower portion thereof and a down stop at an upper portion thereof. 9. The safety valve of claim 8, wherein the transition member engages the up stop as the second piston assembly moves upwards within the piston bore and thereby stops axial advancement of the second piston assembly. 10. The safety valve of claim 9, wherein engagement between the up stop and the transition member generates a mechanical seal therebetween. 11. The safety valve of claim 8, wherein the second piston assembly engages the down stop as the second piston assembly moves downward within the piston bore and thereby stops axial advancement of the second piston assembly. 12. The safety valve of claim 1, wherein the safety valve is configured to open and/or close the valve closure device using one or both of the first and second control lines. 13. A method of actuating a safety valve, comprising: introducing hydraulic fluid pressure to a piston bore with one or both of a first control line and a second control line, the first and second control lines being positioned independently from each other and independently communicably coupled to the piston bore, the piston bore being defined within a housing which also defines a first control line port for communicably coupling the first control line to the piston bore and a second control line port for communicably coupling the second control line to the piston bore, wherein a first piston assembly and a second piston assembly are each independently actuatable by at least one of the first and second control lines, and movably arranged within the piston bore;axially translating at least the second piston assembly downward within the piston bore in response to the hydraulic fluid pressure, the second piston assembly including a transition member arranged at a distal end thereof;axially displacing a flow tube with the transition member coupled thereto, the flow tube being arranged within a flow passage defined in the safety valve; andmoving a valve closure device with the flow tube from a closed position which restricts fluid flow through the flow passage to an open position. 14. The method of claim 13, wherein introducing the hydraulic fluid pressure to the piston bore further comprises, introducing the hydraulic fluid to the piston bore with only the first control line. 15. The method of claim 14, further comprising: forcing the first piston assembly downward within the piston bore; andbiasing the second piston assembly with the first piston assembly, thereby axially translating the second piston assembly downward within the piston bore. 16. The method of claim 13, wherein introducing the hydraulic fluid pressure to the piston bore further comprises, introducing the hydraulic fluid to the piston bore with only the second control line. 17. The method of claim 16, further comprising: forcing the first piston assembly toward the first control line port; andforcing the second piston assembly downward within the piston bore. 18. The method of claim 17, further comprising: biasing the first piston assembly with an up stop defined in the piston bore; andgenerating a mechanical seal between the up stop and the first piston assembly. 19. The method of claim 13, further comprising: engaging the second piston assembly on a down stop provided at an upper portion of a down/up stop seat, the down/up stop seat being arranged within the piston bore; andgenerating a mechanical seal between the down stop and the second piston assembly. 20. The method of claim 13, further comprising: reducing the hydraulic fluid pressure within the piston bore;biasing the second piston assembly upwardly within the piston bore with a spring arranged within the piston bore;engaging the transition member on an up stop provided at a lower portion of a down/up stop seat; andgenerating a mechanical seal between the up stop and the transition member. 21. A method of actuating a safety valve where a first control line communicably coupled to the safety valve at a first control line port becomes inoperable, comprising: introducing hydraulic fluid pressure to a piston bore with a second control line, the second control line being positioned independently from the first control line, and independently communicably coupled to the piston bore, the piston bore being defined within a housing which also defines a second control line port for communicably coupling the second control line to the piston bore, wherein a first piston assembly and a second piston assembly are each independently actuatable by at least one of the first and second control lines, and movably arranged within the piston bore;axially translating the second piston assembly downward within the piston bore in response to the hydraulic fluid pressure, the second piston assembly including a transition member arranged at a distal end thereof;axially displacing a flow tube with the transition member coupled thereto, the flow tube being arranged within a flow passage defined in the safety valve; andmoving a valve closure device with the flow tube from a closed position which restricts fluid flow through the flow passage to an open position. 22. The method of claim 21, further comprising: forcing the first piston assembly toward the first control line port defined in the housing; andforcing the second piston assembly downward within the piston bore. 23. The method of claim 22, further comprising: biasing the first piston assembly with an up stop defined in the piston bore; andgenerating a mechanical seal between the up stop and the first piston assembly. 24. The method of claim 23, further comprising: engaging the second piston assembly on a down stop provided at an upper portion of a down/up stop seat, the down/up stop seat being arranged within the piston bore; andgenerating a mechanical seal between the down stop and the second piston assembly. 25. The method of claim 23, further comprising: reducing the hydraulic fluid pressure within the piston bore;biasing the second piston assembly upwardly within the piston bore with a spring arranged within the piston bore;engaging the transition member on an up stop provided at a lower portion of a down/up stop seat; andgenerating a mechanical seal between the up stop and the transition member.
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