Submerged buoyant offshore drilling and production tower

Details Submerged buoyant offshore drilling and production tower Submerged buoyant offshore drilling and production tower

E - Fixed Constructions

21

B

166/51

E21B 17/00 (2006.01) E21B 7/128 (2006.01) E21B 17/01 (2006.01)

Patent

CA 1173358

13451:HAC SUBMERGED BUOYANT OFFSHORE DRILLING AND PRODUCTION TOWER ABSTRACT OF THE DISCLOSURE A submerged tubular tower 10 is connected at its lower end 15 to an ocean floor 11 at a site where at least one subsea hydrocarbon well is to be drilled. A riser duct 22 for each well to be drilled extends from an upwardly accessible connection point 20 at the upper end 14 of the tower to the lower end of the tower. The tower is positively buoyant to stand erect in an unguyed manner. The upper end of the tower is located a substantial distance above the ocean floor at a depth sufficiently small to enable wells to be drilled through the riser ducts, through equipment 19 landed on the top of the tower, using floating drilling equipment 12 designed for use in substantially shallower water depths.

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