E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
E02D 5/74 (2006.01) B63B 35/44 (2006.01) B63B 39/06 (2006.01) E02D 23/00 (2006.01) E21B 43/01 (2006.01)
Patent
CA 2197942
A floating caisson for offshore drilling and production that includes means for increasing the natural period of the caisson and reducing heave, pitch, and roll without increasing the overall length of the caisson. The caisson is self buoyant by means of buoyancy tanks and is held in position by mooring lines. The caisson has a center well through which drilling and/or production risers pass. One or more plates extend radially from the caisson below the water surface. The plates provide additional mass and resistance to environmentally induced motions and thus increase the natural period of the caisson beyond the periods of maximum wave energy. This allows the caisson to be designed with a shallower draft than a caisson without the plates that would normally be used in deep water.
Caisson flottant pour la production et le forage en mer comportant des moyens d'augmenter la période de vie naturelle du caisson et de réduire le pilonnement, le tangage et le roulis sans accroître la longueur du caisson. Le caisson est insubmersible grâce à des caisses de flottabilité et est tenu en place par des lignes d'ancrage. Il possède un puits central par lequel passent des tubes goulottes de forage et/ou de production. Une ou plusieurs plaques se prolongent radialement à partir du caisson sous la surface de l'eau. Les plaques fournissent une masse et une résistance additionnelles aux mouvements causés par le milieu. Par conséquent, elles repoussent la période de vie naturelle du caisson au-delà des périodes d'énergie maximale des vagues. Les plaques permettent de concevoir un caisson ayant un tirant d'eau encore plus faible qu'un caisson sans plaque qui serait utilisé normalement en eau profonde.
Deep Oil Technology Incorporated
Ridout & Maybee Llp
LandOfFree
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