Offshore production system with drilling/workover rig
First Claim
1. An offshore production system for use in a sea location over a sea floor, which includes a floating hull rotatably connected to a turret to allow the hull to rotate about a primarily vertical turret axis about the turret, a mooring system that moors the turret to the sea floor to limit turret rotation, a fluid swivel device that has a plurality of fluid swivels that have rotatable swivel parts that rotate with the hull and that have nonrotatable swivel parts, a plurality of risers extending from wells in the sea floor to the nonrotatable swivel parts, and a plurality of conduits that extend from the rotatable swivel parts to the vessel hull, comprising:
- a tubing-supporting rig mounted on said turret;
a tube extending down from said rig to the sea floor; and
wherein;
said rig has a primarily vertical tube-supporting rig axis that is spaced from said turret axis;
said plurality of risers have parts lying at a bottom of said turret, that are centered on a primarily vertical riser axis that is spaced from said turret axis;
said riser and rig axes lying on primarily opposite sides of said turret axis.
1 Assignment
0 Petitions
Accused Products
Abstract
An offshore hydrocarbon production system includes a vessel (12) with a turret (16), and a fluid swivel (50) on the turret that is connected to risers (41–43) that extend to the sea floor (26), wherein a drilling/workover rig (60) on the vessel can lower tubing (65) toward the sea floor without danger that the tubing will wrap about the risers when the hull weathervanes. The rig is mounted on the turret. Pipes (54) that extend from the rotatable part of the fluid swivel to fittings (55) on the hull (14), are supported on a gantry (80) that is fixed to the hull and having a gantry middle portion (106) that extends over the turret. The gantry middle portion extends higher than the top (88) of the rig.
15 Citations
10 Claims
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1. An offshore production system for use in a sea location over a sea floor, which includes a floating hull rotatably connected to a turret to allow the hull to rotate about a primarily vertical turret axis about the turret, a mooring system that moors the turret to the sea floor to limit turret rotation, a fluid swivel device that has a plurality of fluid swivels that have rotatable swivel parts that rotate with the hull and that have nonrotatable swivel parts, a plurality of risers extending from wells in the sea floor to the nonrotatable swivel parts, and a plurality of conduits that extend from the rotatable swivel parts to the vessel hull, comprising:
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a tubing-supporting rig mounted on said turret; a tube extending down from said rig to the sea floor; and
wherein;said rig has a primarily vertical tube-supporting rig axis that is spaced from said turret axis; said plurality of risers have parts lying at a bottom of said turret, that are centered on a primarily vertical riser axis that is spaced from said turret axis; said riser and rig axes lying on primarily opposite sides of said turret axis. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An offshore production system that includes a vessel hull, a nonrotatable turret that is moored to the sea floor and that is supported on said hull by a bearing arrangement that allows said vessel hull to weathervane about said turret about a turret axis, at least one fluid swivel device with rotatable and nonrotatable swivel parts, and at least one riser that extends up from the sea floor and through said turret to said nonrotatable swivel part, comprising:
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a gantry having a gantry end mounted on said vessel hull and having a gantry middle portion that lies over said turret, said gantry middle portion being capable of supporting weight by transferring the downward force of the weight to said gantry end, said rotatable swivel part lying above said turret deck and being attached to said gantry middle portion; a tube-supporting rig mounted on said turret, said turret having a top deck and said rig projecting a plurality of meters above said turret top deck, the rig having a rig top lying a predetermined horizontal distance from said turret axis;
a tube extending down from said rig to the sea floor;said gantry middle portion has a gantry part lying above the height of said rig top above said turret top deck, so said gantry part moves over said rig top when the vessel hull weathervanes. - View Dependent Claims (9)
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10. An offshore production system for use in a sea location over a sea floor, which includes a floating hull rotatably connected to a turret to allow the hull to rotate about a primarily vertical turret axis about the turret, a mooring system that moors the turret to the sea floor to limit turret rotation, a fluid swivel device that has a plurality of fluid swivels that have rotatable swivel parts that rotate with the hull and that have nonrotatable swivel parts, a plurality of risers extending from wells in the sea floor to the nonrotatable swivel parts, and a plurality of conduits that extend from the rotatable swivel parts to the vessel hull, comprising:
a tubing-supporting rig mounted on said turret at a location horizontally spaced from said turret axis, and a tube that extends down from said rig to the sea floor in an operating condition of the system, to assure that the rig and the tube do not rotate with respect to the risers.
Specification