Spar-type offshore platform for ice flow conditions
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B63B-035/44
B63B-022/02
B63B-022/00
출원번호
US-0462959
(2006-08-07)
등록번호
US-7377225
(2008-05-27)
발명자
/ 주소
Finn,Lyle
Steen,Atle
출원인 / 주소
Technip France
대리인 / 주소
Klein, O'Neill & Singh, LLP
인용정보
피인용 횟수 :
9인용 특허 :
9
초록▼
A spar-type platform includes a hull defining a centerwell extending downward to a keel. The hull includes a reduced diameter neck portion for diverting ice flow. Adjustable ballast tanks allow the hull to be moved between a ballasted down position defining an upper water line, and a ballasted up po
A spar-type platform includes a hull defining a centerwell extending downward to a keel. The hull includes a reduced diameter neck portion for diverting ice flow. Adjustable ballast tanks allow the hull to be moved between a ballasted down position defining an upper water line, and a ballasted up position defined by a lower water line. A riser a support buoy is disposed in the keel. Risers extend through the centerwell, each having an upper portion extending upward from the support buoy and a lower portion supported in the support buoy. A disconnect system detachably connects the support buoy to the hull and the upper portion of each riser to the lower portion thereof, whereby the hull and the upper portion of each riser are selectively detachable from the buoy and the lower portion of each riser for movement to avoid a collision with a floating object.
대표청구항▼
We claim: 1. A spar-type offshore platform for oil and gas drilling and production operations, comprising: a hull having an axial centerwell extending to a keel; a riser support buoy detachably disposed in the keel of the hull; and a riser comprising an upper riser portion passing through the cente
We claim: 1. A spar-type offshore platform for oil and gas drilling and production operations, comprising: a hull having an axial centerwell extending to a keel; a riser support buoy detachably disposed in the keel of the hull; and a riser comprising an upper riser portion passing through the centerwell and a lower riser portion supported in the riser support buoy and detachably connected to the upper riser portion; whereby the hull and the upper riser portion are selectively detachable from the buoy and the lower riser portion for movement of the hull and the upper riser portion to avoid a collision with a floating object. 2. The spar-type platform of claim 1, wherein the hull includes an upper hull portion and a lower hull portion joined by a reduced diameter neck portion. 3. The spar-type platform of claim 2, wherein the reduced diameter neck portion is joined to the upper hull portion by a tapered transition portion. 4. The spar-type platform of claim 3, further comprising an adjustable ballast tank into which seawater ballast may be controllably introduced and from which seawater ballast may be controllably evacuated, so as to move the hull between a ballasted down position having an upper water line defined on the upper hull portion, and a ballasted up position having a lower water line defined on the transition portion. 5. The spar-type platform of claim 1, wherein the hull and the upper riser portion are detachable from the buoy and the lower riser portion by a disconnect system that comprises: a riser coupler that releasably couples the upper riser portion to the lower riser portion; a latch mechanism that releasably secures the buoy to the keel of the hull; and a buoy lowering mechanism that is selectively operable to lower the buoy when the riser coupler and the latch mechanism are released, and to raise the buoy back up into the keel to re-connect the buoy to the hull. 6. The spar-type platform of claim 5, wherein the buoy-lowering mechanism comprises: a winch; and a plurality of buoy-lowering lines wound on the winch and detachably attached to the buoy. 7. The spar-type platform of claim 6, wherein the buoy-lowering lines extend through the centerwell. 8. The spar-type platform of claim 6, wherein the buoy-lowering lines are detachably attached to the buoy by a remotely-operable ball-and-socket mechanism. 9. The spar-type platform of claim 5, wherein at least one of the riser coupler and the latch mechanism is remotely-operable. 10. The spar-type platform of claim 9, wherein both the riser coupler and the latch mechanism are remotely-operable. 11. A spar-type offshore platform for oil and gas drilling and production operations, comprising: a hull comprising an upper hull portion, a lower hull portion, and a reduced-diameter neck portion joining the upper hull portion and the lower portion, wherein the hull has a center-well extending axially to a keel; a riser support buoy detachably disposed in the keel; a riser comprising an upper riser portion passing through the centerwell and a lower riser portion supported in the riser support buoy and detachably connected to the upper riser portion; and an adjustable ballast mechanism that is operable to selectively move the hull between a ballasted down position in which an upper water line is defined across the upper hull portion, and a ballasted up position in which a lower water line is defined below the upper portion; whereby the hull and the upper riser portion are selectively detachable from the buoy and the lower riser portion for movement of the hull and the upper riser portion to avoid a collision with a floating object. 12. The spar-type platform of claim 11, wherein the hull and the upper riser portion are detachable from the buoy and the lower riser portion by a disconnect system that comprises: a riser coupler that releasably couples the upper riser portion to the lower riser portion; a latch mechanism that releasably secures the buoy to the keel of the hull; and a buoy lowering mechanism that is selectively operable to lower the buoy when the riser coupler and the latch mechanism are released, and to raise the buoy back up into the keel to reconnect the buoy to the hull. 13. The spar-type platform of claim 12, wherein the buoy-lowering mechanism comprises: a winch; and a plurality of buoy-lowering lines wound on the winch and detachably attached to the buoy. 14. The spar-type platform of claim 13, wherein the buoy-lowering lines extend through the centerwell. 15. The spar-type platform of claim 13, wherein the buoy-lowering lines are detachably attached to the buoy by a remotely-operable ball-and-socket mechanism. 16. The spar-type platform of claim 12, wherein at least one of the riser coupler and the latch mechanism is remotely-operable. 17. The spar-type platform of claim 16, wherein both the riser coupler and the latch mechanism are remotely-operable. 18. A method of moving a hull of a spar-type offshore platform for oil and gas drilling and production operation, comprising: providing a floating hull secured to a seabed by a plurality of mooring lines, the hull having a centerwell extending to a keel; detachably securing a riser support buoy in the keel of the hull; providing a riser comprising an upper riser portion passing through the centerwell and a lower riser portion supported in the riser support buoy and connected to the seabed, the lower riser portion being detachably connected to the upper riser portion; disconnecting the upper riser portion from the lower riser portion; detaching the riser support buoy from the keel of the hull; lowering the riser support buoy with the lower rise portion relative to the hull with a plurality of buoy lowering lines; disconnecting the buoy lowering lines from the riser support buoy; severing the mooring lines; and moving the hull and the upper riser portion away from the riser support buoy and the lower riser portion supported therein. 19. The method of claim 18, wherein at least one of the steps of disconnecting the upper riser portion from the lower riser portion, detaching the riser support buoy from the keel of the hull, and disconnecting the buoy lowering lines from the riser support buoy is performed remotely. 20. The method of claim 19, wherein the hull is ballast-adjustable so that it is selectively movable between a ballasted down position and a ballasted up position. 21. The method of claim 18, wherein the riser support buoy is re-attachable to the keel of the hull, the upper riser portion is re-attachable to the lower riser portion, and the buoy-lowering lines are re-attachable to the riser support buoy.
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