IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0838776
(2010-07-19)
|
등록번호 |
US-8540017
(2013-09-24)
|
발명자
/ 주소 |
- Ensley, Eric Trevor
- Springett, Frank Benjamin
- Weir, James William
|
출원인 / 주소 |
- National Oilwell Varco, L.P.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
203 |
초록
▼
Systems and methods for sealing a wellbore are provided. The wellbore has a pipe therein for the passage of fluid therethrough. The system is provided with a BOP positionable about the pipe and at least one seal assembly positionable about the BOP. Each of the seal assemblies has a plurality of bloc
Systems and methods for sealing a wellbore are provided. The wellbore has a pipe therein for the passage of fluid therethrough. The system is provided with a BOP positionable about the pipe and at least one seal assembly positionable about the BOP. Each of the seal assemblies has a plurality of blocks positionable within the BOP, at least one actuator for selectively moving the blocks to a contact position surrounding the pipe, and a plurality of pipe seals carried by the blocks for creating a seal about the pipe of the wellbore. Each block has an opening extending into a cavity therein. Each pipe seal is positionable in one of the cavities and flowable through the opening thereof as the blocks are moved into the contact position whereby at least a portion of a pressure applied to the pipe seals is released from the blocks.
대표청구항
▼
1. A seal assembly for sealing a wellbore, the wellbore having a pipe therein for passage of fluid therethrough and a blowout preventer (BOP) receiving the pipe therethrough, the seal assembly comprising: a plurality of blocks positionable within the BOP, each of the plurality of blocks having an op
1. A seal assembly for sealing a wellbore, the wellbore having a pipe therein for passage of fluid therethrough and a blowout preventer (BOP) receiving the pipe therethrough, the seal assembly comprising: a plurality of blocks positionable within the BOP, each of the plurality of blocks having an opening extending into a cavity therein;at least one actuator for selectively moving the plurality of blocks to a contact position surrounding the pipe of the wellbore; anda plurality of pipe seals carried by the plurality of blocks for creating a seal about the pipe of the wellbore, the plurality of pipe seals being positionable in the cavity of the plurality of blocks and flowable through the opening thereof whereby at least a portion of a pressure applied to the plurality of pipe seals is released from the plurality of blocks. 2. The seal assembly of claim 1, further comprising a plurality of dynamic pipe seals for creating a seal about the pipe of the wellbore, the plurality of dynamic pipe seals carried by the plurality of blocks and selectively extendable therefrom for sealing engagement about the pipe after the plurality of blocks is moved to the contact position whereby the plurality of dynamic pipe seals is prevented from extending between the plurality of blocks as the plurality of blocks is moved to the contact position. 3. The seal assembly of claim 2, wherein each of the plurality of pipe seals comprises a face seal supported by a base, the face seal adapted to receive the pipe for sealing engagement therewith. 4. The seal assembly of claim 3, wherein the plurality of pipe seals further comprises a drive shaft operatively connectable to the base for selective extension thereof. 5. The seal assembly of claim 3, wherein each of the plurality of pipe seals comprises at least one seal support in the face seal for providing support thereto. 6. The seal assembly of claim 5, wherein the at least one seal support comprises a plurality of interlocking segments. 7. The seal assembly of claim 2, further comprising at least one locking arm for securing at least one of the plurality of pipe seals in a desired position. 8. The seal assembly of claim 7, wherein the at least one locking arm is carried by at least one of the plurality of pipe seals and is selectively extendable therefrom, the at least one locking arm extendable into a corresponding at least one pocket in the BOP. 9. The seal assembly of claim 1, wherein the opening of the plurality of blocks extends through a bottom surface thereof, each of the plurality of pipe seals flowable from the cavity and through the opening in the bottom surface. 10. The seal assembly of claim 1, further comprising an anti-extrusion ring for preventing each of the plurality of pipe seals from flowing between the plurality of blocks. 11. The seal assembly of claim 1, further comprising an anti-extrusion plate for preventing each of the plurality of pipe seals from flowing between the plurality of blocks. 12. The seal assembly of claim 1, further comprising at least one surface seal for creating a seal between the plurality of blocks and the BOP. 13. The seal assembly of claim 12, wherein each of the plurality of blocks has a channel for receiving the at least one surface seal. 14. The seal assembly of claim 13, wherein at least a portion of the channel is in a top surface of the plurality of blocks. 15. The seal assembly of claim 14, wherein a portion of the channel is in a contact surface of the plurality of blocks. 16. The seal assembly of claim 12, wherein each of the plurality of blocks has a depression in a top surface thereof for receiving the at least one surface seal. 17. The seal assembly of claim 16, further comprising an adapter positionable in the depression for sealing engagement with the at least one surface seal when the plurality of blocks is moved to the contact position. 18. A system for sealing a wellbore, the wellbore having a pipe therein for the passage of fluid therethrough, the system comprising: a BOP receiving the pipe therethrough; andat least one seal assembly positionable about the BOP, each of the at least one seal assemblies comprising: a plurality of blocks positionable within the BOP, each of the plurality of blocks having an opening extending into a cavity therein;at least one actuator for selectively moving the plurality of blocks to a contact position surrounding the pipe of the wellbore; anda plurality of pipe seals carried by the plurality of blocks for creating a seal about the pipe of the wellbore, the plurality of pipe seals being positionable in the cavity of the plurality of blocks and flowable through the opening thereof whereby at least a portion of a pressure applied to the plurality of pipe seals is released from the plurality of blocks. 19. The system of claim 18, further comprising an adapter positionable between the at least one seal assembly and the BOP. 20. The system of claim 19, wherein each of the plurality of blocks has a depression therein for receiving the adapter. 21. The system of claim 20, wherein the at least one seal assembly further comprises a surface seal positionable in the depression between each of the plurality of blocks and the adapter for creating a seal therebetween. 22. The system of claim 18, wherein the at least one seal assembly comprises a plurality of seal assemblies, the plurality of seal assemblies activatable simultaneously. 23. The system of claim 18, wherein the at least one seal assembly comprises a plurality of seal assemblies, the plurality of seal assemblies activatable independently. 24. The system of claim 18, further comprising at least one dynamic pipe seal. 25. The system of claim 18, wherein the at least one seal assembly further comprises a surface seal. 26. The system of claim 18, further comprising at least one controller for selectively activating the at least one actuator. 27. A method for sealing a wellbore, the wellbore having a pipe therein for the passage of fluid therethrough, the method comprising: positioning the pipe through a BOP, the BOP having a seal assembly therein comprising a plurality of blocks, each of the plurality of blocks having an opening extending into a cavity therein and a pipe seal in each cavity;pressing the pipe seals into sealing engagement with the pipe by selectively moving the plurality of blocks therein to a contact position surrounding the pipe of the wellbore; andpermitting at least a portion of the pipe seals to flow through the opening of the plurality of the blocks such that at least a portion of a pressure applied to the plurality of pipe seals is released from the plurality of blocks. 28. The method of claim 27, wherein each of the plurality of blocks has a dynamic pipe seal therein, and wherein the method further comprises creating a seal about the pipe of the wellbore by selectively extending the dynamic pipe seals from the plurality of blocks and into sealing engagement about the pipe after the plurality of blocks are moved into the contact position such that the dynamic pipe seals are prevented from extending between the plurality of blocks as the plurality of blocks is moved to the contact position. 29. The method of claim 28, further comprising locking the plurality of blocks in a desired position. 30. The method of claim 28, further comprising locking the dynamic pipe seal in a desired position. 31. The method of claim 28, further comprising selectively retracting the dynami pipe seals. 32. The method of claim 27, further comprising selectively moving the plurality of blocks to a non-contact position. 33. The method of claim 27, wherein the seal assembly further comprises a surface seal in a contact surface of each of the plurality of blocks, the method further comprising sealing the plurality of blocks together. 34. The method of claim 27, wherein the seal assembly further comprises a surface seal in a top surface of each of the plurality of blocks, the method further comprising sealing the plurality of blocks with the BOP. 35. The method of claim 34, further comprising positioning an adapter in the BOP, the step of sealing the plurality of blocks comprising sealing the plurality of blocks with the adapter via the surface seal. 36. The method of claim 27, further comprising preventing the pipe seals from extending between the plurality of blocks.
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