Patent ID: 7172479
Filing Date: 2007-02-06
Classification: B63B,E21B

Abstract:
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.