Offshore production system with drilling/workover rig

摘要

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.