Offshore oil production system

Details Offshore oil production system Offshore oil production system

E - Fixed Constructions

21

B

166/46.1

E21B 43/01 (2006.01) B63B 22/02 (2006.01)

Patent

CA 2011835

Case7167(2) ABSTRACT OF THE DISCLOSURE OFFSHORE OIL PRODUCTION SYSTEM An offshore oil production and mooring system comprises: (a) a subsea base located on the sea bed associated with (b) a subsea connector adapted for connecting a subsea well head production system to a production riser, (c) a subsea restraining buoy located at a position below the sea surface but above the sea bed, (d) a buoyant riser endpiece adapted for connection to a loading vessel, located in its rest position at a position below the sea surface but above the sea bed, and anchorable to the sea bed, (e) a flexible lower support line pivottally connecting the restraining buoy to the subsea base, (f) a flexible upper support line pivottally connecting the restraining buoy to the riser endpiece, and (g) a flexible production riser connected to the subsea connector (b) and supported by the lower support line (e), the subsea restraining buoy (c), and the upper support line (f) and connected to the riser endpiece (d). When moored to the system, a vessel is free to rotate around the mooring system using the torsional flexibility of the lower support line, the riser, and an umbilical ant water injection line if present. There are no swivels in the system, thus reducing complexity and costs.

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