Floating/tensioned production system with caisson

Wells – Submerged well – Submerged – buoyant wellhead or riser

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Details

166355, 166356, 166358, 175 7, 175 8, 405195, E21B 7128, E21B 4301, B63B 3544

Patent

active

049132385

ABSTRACT:
A floating/tensioned production system for use in deepwater drilling and production operations generally combining a relatively small tension leg platform with a semisubmersible platform. The semisubmersible platform is provided with a working deck supported above the water surface so that an air gap exists between the working deck and the water surface. The tension leg platform provides a heave-restrained production deck for near-surface wellhead equipment. The production deck is supported above the drill site but beneath the water surface by buoyancy members and held in place by one or more tethers. Most other drilling and production equipment is located on the semisubmersible working deck. A caisson, surrounding the production deck, is used to provide a substantially dry working area. In one embodiment, the caisson is retractably attached to the production deck. In an alternative embodiment, the caisson is attached to the bottom of the working deck, extending downwardly to sealingly engage with the production deck.

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Disclosure dated Aug. 1988 (received at EPR 11-17-88) entitled "Deepwater Floating Production System with Surface Wellheads" by Friede & Goldman.

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