Hydraulic and earth engineering – Marine structure or fabrication thereof – With anchoring of structure to marine floor
Patent
1989-10-12
1990-06-19
Taylor, Dennis L.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With anchoring of structure to marine floor
405195, 166335, 166350, E02D 554
Patent
active
049348710
ABSTRACT:
An offshore subsea well includes a wellhead to which is connected an elongated somewhat flexible riser extending to the sea surface. The riser pipe is unstayed and is buoyed at least partially by a buoyancy member connected to the riser between the sea surface and the wellhead. Flow control valves and well access components are disposed at the upper end of the riser pipe and extend only a few feet above the sea surface during a normal or calm sea condition. A production fluid flowline returns to the sea floor alongisde the riser for extension to a central platform for the reservoir. The well support system provides for a low cost surface disposed Christmas tree arrangement which does not require a fixed support platform. The buoyancy member is preferably an annular can which is connected to an upper end of an elastically bendable section of the riser and which supports a tower for a work platform and hazards to navigation aids.
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Atlantic Richfield Company
Martin Michael E.
Olsen Arlen L.
Taylor Dennis L.
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