Curved flapper with angle variant seat for a subsurface safety valve
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-034/14
F16K-031/12
출원번호
US-0292898
(2002-11-12)
발명자
/ 주소
Hill, Jr., Thomas G.
Jancha, Robert A.
Henschel, Robert C.
출원인 / 주소
Weatherford/Lamb, Inc.
대리인 / 주소
Moser, Patterson &
인용정보
피인용 횟수 :
11인용 특허 :
11
초록▼
A subsurface safety valve for controlling fluid flow in a well bore. In one embodiment, the subsurface safety valve includes a tubular member having a longitudinal bore extending therethrough, a curved flapper removably connected to the tubular member. The curved flapper is configured to pivot again
A subsurface safety valve for controlling fluid flow in a well bore. In one embodiment, the subsurface safety valve includes a tubular member having a longitudinal bore extending therethrough, a curved flapper removably connected to the tubular member. The curved flapper is configured to pivot against the tubular member between an open position and a closed position. The subsurface safety valve further includes a hard seat positioned inside the tubular member, in which the hard seat defines a seating surface configured to receive a sealing surface defined on a bottom periphery portion of the curved flapper to form a sealing interface having a slope that varies along the sealing interface.
대표청구항▼
1. A subsurface safety valve for controlling fluid flow in a well bore, comprising:a tubular member having a longitudinal bore extending therethrough; a curved flapper removably connected to the tubular member, wherein the curved flapper is configured to pivot against the tubular member between an o
1. A subsurface safety valve for controlling fluid flow in a well bore, comprising:a tubular member having a longitudinal bore extending therethrough; a curved flapper removably connected to the tubular member, wherein the curved flapper is configured to pivot against the tubular member between an open position and a closed position; and a hard seat positioned inside the tubular member, wherein the hard seat defines a seating surface configured to receive a sealing surface defined on a bottom periphery portion of the curved flapper to form a sealing interface having a slope that varies along the sealing interface to substantially inhibit distortion between the curved flapper and the tubular member. 2. The subsurface safety valve of claim 1, wherein the slope of the sealing interface is configured to generate reactive forces from the hard seat normal to the sealing interface.3. The subsurface safety valve of claim 1, wherein the sealing interface is configured to substantially prevent the curved flapper from bending toward the tubular member.4. The subsurface safety valve of claim 1, wherein the sealing interface is undulated.5. The subsurface safety valve of claim 1, wherein the sealing interface is undulated and defines at least two raised portions and at least two lower portions, and wherein the slope of the sealing interface near the at least two raised portions is about zero degree with respect to an x-axis.6. The subsurface safety valve of claim 5, wherein the raised portions and the lower portions are about 90 degrees apart.7. The subsurface safety valve of claim 5, wherein the slope of the sealing interface is configured to generate reactive forces from the hard seat normal to the sealing interface.8. The subsurface safety valve of claim 1, wherein the sealing interface is undulated and defines at least two raised portions and at least two lower portions, and wherein the slope of the sealing interface is between about ?10 degrees to about ?15 degrees with respect to an x-axis near the at least two lower portions.9. The subsurface safety valve of claim 8, wherein the raised portions and the lower portions are about 90 degrees apart.10. The subsurface safety valve of claim 8, wherein the slope of the sealing interface is configured to generate reactive forces from the hard seat normal to the sealing interface.11. The subsurface safety valve of claim 1, wherein the sealing interface is undulated and defines at least two raised portions and at least two lower portions, wherein the slope of the sealing interface is about zero degrees with respect to an x-axis near the at least two raised portions, and wherein the slope of the sealing interface is between about ?10 degrees to about ?15 degrees with respect to the x-axis near the at least two lower portions.12. The subsurface safety valve of claim 11, wherein the raised portions and the lower portions are about 90 degrees apart.13. The subsurface safety valve of claim 11, wherein the slope of the sealing interface is configured to generate reactive forces from the hard seat normal to the sealing interface.14. The subsurface safety valve of claim 1, further comprising a soft seat disposed adjacent the hard seat.15. The subsurface safety valve of claim 14, wherein the flapper contacts the soft seat before contacting the hard seat when the flapper is moved from its open position to its closed position.16. The subsurface safety valve of claim 14, wherein the soft seat is made from an elastomeric material.17. The subsurface safety valve of claim 1, further comprising a soft seat concentrically disposed an outside perimeter of the hard seat.18. The subsurface safety valve of claim 1, wherein the hard seat is fabricated from a metal alloy.19. The subsurface safety valve of claim 1, further comprising an actuator mechanism for selectively opening the flapper.20. The subsurface safety valve of claim 19, further comprising a pressure equalizing valve for permitting fluid to bleed through the flapper when the actuator mechanism is actuated, thereby equalizing any pressure differential across the flapper and enabling the flapper to open.21. A curved flapper for a well bore safety valve, wherein the curved flapper is configured to pivot between an open position and a closed position, the curved flapper comprising:a sealing surface for engaging a corresponding sealing surface on a seat disposed in the well bore safety valve to form a sealing interface having a slope that varies along the sealing interface such that reactive forces from the seat are normal to the sealing interface, thereby substantially reducing distortion between the curved flapper and the seat to inhibit the upward flow of fluids in a well bore when the curved flapper is in the closed position. 22. The subsurface safety valve of claim 21, wherein the sealing interface is configured to substantially prevent the curved flapper from bending toward the well bore safety valve.23. The subsurface safety valve of claim 21, wherein the sealing interface is undulated and defines at least two raised portions and at least two lower portions, and wherein the slope of the sealing interface is about zero degree with respect to an x-axis near the at least two raised portions.24. The subsurface safety valve of claim 23, wherein the raised portions and the lower portions are about 90 degrees apart.25. The subsurface safety valve of claim 21, wherein the sealing interface is undulated and defines at least two raised portions and at least two lower portions, and wherein the slope of the sealing interface is between about ?10 degrees to about ?15 degrees with respect to an x-axis near the at least two lower portions.26. The subsurface safety valve of claim 25, wherein the raised portions and the lower portions are about 90 degrees apart.27. The subsurface safety valve of claim 21, wherein the sealing interface is undulated and defines at least two raised portions and at least two lower portions, wherein the slope of the sealing interface is about zero degree with respect to an x-axis near the at least two raised portions, and wherein the slope of the sealing interface is between about ?10 degrees to about ?15 degrees with respect to the x-axis near the at least two lower portions.28. The subsurface safety valve of claim 27, wherein the raised portions and the lower portions are about 90 degrees apart.29. A valve for controlling fluid flow in a well bore, comprising:a tubular member having a longitudinal bore therethrough; a curved flapper having a seating surface, the curved flapper configured to pivot against the tubular member between an open position and a closed position; and a seat positioned inside the tubular member, the seat defining a seating surface configured to receive the sealing surface to form a sealing interface having a slope that is about zero degree with respect to an x-axis near at least two raised portions, and wherein the slope of the sealing interface is between about ?10 degrees to about ?15 degrees with respect to the x-axis near at least two lower portions to substantially inhibit distortion between the curved flapper and the tubular member. 30. The valve of claim 29, wherein the slope of the sealing interface is configured to generate reactive forces from the seat normal to the sealing interface.
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이 특허에 인용된 특허 (11)
Dollison William W. (Dallas TX), Casing shut-in valve system.
Sproul Richard M. (Grapevine TX) Giusti ; Jr. Frank (Lewisville TX) Grant Richard L. (Riveridge LA) Brown Kennedy J. (Belle Chasse LA), Expendable flapper valve.
Echols ; III Ralph H. (Carrollton TX) Pearce Joseph L. (Dallas TX) Patterson Daniel L. (Brunei Darussalam MYX), System containing expendible isolation valve with frangible sealing member, seat arrangement and method for use.
Rawson Michael S. (Tulsa OK) Trott Doug (Coweta OK) Megill Mark S. (Tulsa OK) Beall Clifford H. (Broken Arrow OK), Undulating transverse interface for curved flapper seal.
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