Patent ID: 6336421
Filing Date: 2002-01-08
Classification: B63B,E21B

Abstract:
A subsea production and well intervention system for deployment in deep water conditions having a depth of about 2000 feet or greater, comprising:(a) a plurality of subsea wells each having subsea wellheads located at the sea floor and being located on a defined area of the sea floor, said defined area not substantially exceeding about 250 feet in any direction: (b) a deep draft floating spar adapted for location generally above the subsea wellheads and having a production platform located above the sea surface, having buoyancy and ballast chambers and defining a riser bore, said deep draft floating spar having a diameter less than said defined area of the sea floor and having an intervention riser system for conducting well servicing intervention on any of said plurality of subsea wells; (c) a plurality of mooring lines for mooring said deep draft floating spar and for controlling lateral positioning of said deep draft floating spar for stationing of said intervention riser system thereof above a selected subsea wellhead intended for well servicing intervention; (d) a plurality of subsea production manifolds each being connected to receive production flow from a group of said plurality of said subsea wellheads; and (e) a plurality of production risers each being connected to one of said subsea production manifolds and extending upwardly through said riser bore to said production platform.