IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0911295
(2001-07-23)
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발명자
/ 주소 |
- Bourgoyne, Darryl A.
- Hannegan, Don M.
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출원인 / 주소 |
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대리인 / 주소 |
Akin Gump Strauss Hauer &
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인용정보 |
피인용 횟수 :
84 인용 특허 :
121 |
초록
▼
A floating rig or structure for drilling in the floor of an ocean using a rotatable tubular includes a seal housing having a rotatable seal connected above a portion of a marine riser fixed to the floor of the ocean. The seal rotating with the rotating tubular allows the riser and seal housing to ma
A floating rig or structure for drilling in the floor of an ocean using a rotatable tubular includes a seal housing having a rotatable seal connected above a portion of a marine riser fixed to the floor of the ocean. The seal rotating with the rotating tubular allows the riser and seal housing to maintain a predetermined pressure in the system that is desirable in underbalanced drilling, gas-liquid mud systems and pressurized mud handling systems. The seal is contemplated to be either an active seal or a passive seal. A flexible conduit or hose is used to compensate for relative movement of the seal housing and the floating structure because the floating structure moves independent of the seal housing. A method for use of the system is also disclosed.
대표청구항
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1. System adapted for use with a structure for drilling in a floor of an ocean using a rotatable tubular and drilling fluid when the structure is floating at a surface of the ocean, the system comprising:a riser fixed relative to the floor of the ocean, said riser having a top, bottom and an interna
1. System adapted for use with a structure for drilling in a floor of an ocean using a rotatable tubular and drilling fluid when the structure is floating at a surface of the ocean, the system comprising:a riser fixed relative to the floor of the ocean, said riser having a top, bottom and an internal diameter; a housing disposed above a portion of said riser, wherein said housing has a first housing opening to discharge the drilling fluid received from said riser, and at least a portion of said housing is above the surface of the ocean; an assembly having an inner member, said inner member rotatable relative to said housing and having a passage through which the rotatable tubular may extend; a seal moving with said inner member to sealably engage the tubular; a quick disconnect member to disconnect said assembly from said housing; and the floating structure movable independent of said assembly when the tubular is rotating. 2. System of claim 1 wherein said housing permits substantially full bore access to said riser.3. System of claim 1 wherein said assembly is removable from said housing.4. System of claim 1 further comprising a conduit for communicating drilling fluid from said first housing opening to the structure.5. System of claim 1 wherein said quick disconnect member is a clamp.6. System of claim 1 further comprising a choke to control pressure in said riser and said seal.7. System of claim 1 further comprising a second housing opening in said housing and a rupture disk in fluid communication with said second housing opening.8. System of claim 1 wherein said seal is a stripper rubber.9. System adapted for use with a structure for drilling in a floor of an ocean using a rotatable tubular and drilling fluid when the structure is floating at a surface of the ocean, the system comprising:a riser having a top, bottom and an internal diameter; a housing disposed above a portion of said riser, said housing having a first housing opening to discharge the drilling fluid received from said riser; an assembly having an inner member, said inner member rotatable relative to said housing and having a passage through which the rotatable tubular may extend; a seal moving with said inner member to sealably engage the tubular; and a flexible conduit for communicating the drilling fluid from said first housing opening to the structure whereby the structure is movable independent of said housing when the tubular is rotating. 10. System of claim 9 wherein said conduit has a first end and a second end, said first end connected to said first housing opening and said second end connected to a device for receiving the drilling fluid.11. System of claim 10 further comprising pressure in said riser wherein said device controls the pressure in said riser.12. System of claim 9 wherein said seal is a stripper rubber.13. System of claim 9 wherein the drilling fluid is maintained at a predetermined pressure whereby the drilling fluid from said riser flows to the structure above the surface of the ocean to a device for receiving the drilling fluid.14. Method for sealing a riser while drilling in a floor of an ocean from a structure floating at a surface of the ocean using a rotatable tubular and pressurized drilling fluid, comprising the steps of:positioning a housing above a portion of the riser; allowing the floating structure to move independent of said housing; communicating the pressurized drilling fluid from said housing to the structure; compensating for relative movement of the structure and said housing during said step of communicating; and attaching a flexible conduit between an opening of said housing and the floating structure for said step of compensating for relative movement of the structure and said housing. 15. Method of claim 14 further comprising the step of:removing an assembly from said housing whereby an internal diameter of said housing is substantially the same as an internal diameter of the riser. 16. Method of claim 14 further comprising the step of:lowering said housing through a deck of the structure during said step of positioning a housing above a portion of the riser. 17. Method for communicating drilling fluid from a casing fixed relative to an ocean floor to a structure floating at a surface of the ocean while rotating within the casing a tubular, comprising the steps of:fixing a housing with the casing adjacent a first level of the floating structure; allowing the floating structure to move independent of said housing; moving the drilling fluid from the tubular up the casing to a second level of the floating structure above said housing; and rotating the tubular relative to said housing, wherein a seal is within said housing, and said seal contacts and moves with the tubular while the tubular is rotating. 18. Method of claim 17 further comprising the step of:compensating for relative movement of the structure and said housing during said step of moving. 19. Method of claim 17 further comprising the step of:pressurizing the drilling fluid to a predetermined pressure as the drilling fluid flows into the tubular. 20. Method for sealing a riser while drilling in a floor of an ocean from a structure floating at a surface of the ocean using a rotatable tubular and pressurized drilling fluid, comprising the steps of:positioning a housing above a portion of the riser; allowing the floating structure to move independent of said housing; communicating the pressurized drilling fluid from the riser to the structure; compensating for relative movement of the structure and said housing during the step of communicating, and using a flexible conduit in said step of communicating the pressurized drilling fluid to the structure. 21. Method for sealing a riser while drilling in a floor of an ocean from a structure floating at a surface of the ocean using a rotatable tubular and pressurized drilling fluid, comprising the steps of:removably inserting a rotatable seal in a portion of the riser; allowing the floating structure to move independent of the riser; communicating the pressurized drilling fluid from the riser to the structure, and compensating for relative movement of the structure and the riser with a flexible conduit. 22. System adapted for use with a structure for drilling in a floor of an ocean using a rotatable tubular and drilling fluid when the structure is floating at a surface of the ocean, the system comprising:a riser fixed relative to the floor of the ocean; a housing disposed above a portion of said riser, said housing having a first housing opening to discharge the drilling fluid received from said riser; an assembly having an inner member, said inner member rotatable relative to said housing and having a passage through which the rotatable tubular may extend; a seal moving with said inner member to sealably engage the tubular; the floating structure movable independent of said assembly when the tubular is rotating; and a second housing opening in said housing and a rupture disk blocking said second housing opening to block fluid communication from said housing. 23. Method for sealing a riser while drilling in a floor of an ocean from a structure floating at a surface of the ocean using a rotatable tubular and pressurized drilling fluid, comprising the steps of:positioning a housing above a portion of the riser; allowing the floating structure to move independent of said housing; communicating the pressurized drilling fluid from said housing to the structure; compensating for relative movement of the structure and said housing during the step of communicating; and removing an assembly from said housing whereby the housing internal diameter is substantially the same as the riser internal diameter. 24. System adapted for use with a structure for drilling in a floor of an ocean using a rotatable tubular and drilling fluid when the structure is floating at a surface of the ocean, the system comprising:a riser positioned relative to the floor of the ocean, said riser having a top, bottom and an internal diameter; an assembly removably disposed above a portion of said riser having an inner member, a radially outwardly disposed outer member, and a plurality of bearings, wherein said inner member is rotatable relative to said riser and has a passage through which the rotatable tubular may extend, and said plurality of bearings are interposed between said inner member and said radially outwardly disposed outer member; a seal moving with said inner member to sealably engage the tubular; and the floating structure movable independent of said assembly when the tubular is rotating. 25. System of claim 24, further comprising a housing, wherein said assembly is disposed within said housing.26. System of claim 24, wherein upon removal of said assembly none of said plurality of bearings are exposed.27. System of claim 24, wherein upon removal of said assembly said radially outwardly disposed outer member covers said plurality of bearings.28. System adapted for use with a structure for drilling in a floor of an ocean using a rotatable tubular and drilling fluid when the structure is floating at a surface of the ocean, the system comprising:a housing adapted for positioning above a portion of a riser, said housing having a first housing opening to discharge the drilling fluid received from the riser, and an assembly removably positioned within said housing, wherein said assembly has a sealing member, which rotates relative to said housing, and seals the tubular when the tubular is rotating, and the floating structure moves independent of said assembly when the tubular is rotating. 29. System of claim 28, further comprising a flexible conduit for communicating the drilling fluid from said first housing opening to said structure.30. System of claim 28, wherein said housing permits substantially full bore access to said riser.31. System of claim 28, wherein a portion of said housing extends above the surface of the ocean.32. System adapted for use with a structure for drilling in a floor of an ocean using a rotatable tubular and drilling fluid when the structure is floating at a surface of the ocean, the system comprising:an assembly adapted for removable positioning above a portion of a riser having an inner member, a radially outwardly disposed outer member, and a plurality of bearings, wherein said inner member is rotatable relative to the riser and has a passage through which the rotatable tubular may extend, and said plurality of bearings are interposed between said inner member and said radially outwardly disposed outer member; a seal moving with said inner member to sealably engage the tubular; and the floating structure movable independent of said assembly when the tubular is rotating. 33. System of claim 32, wherein upon removal of said assembly none of said plurality of bearings are exposed.34. System of claim 32, wherein upon removal of said assembly said radially outwardly disposed outer member covers said plurality of bearings.
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