Integral buoyant riser

Details Integral buoyant riser Integral buoyant riser

E - Fixed Constructions

21

B

166/51

E21B 33/035 (2006.01) E21B 7/12 (2006.01) E21B 17/01 (2006.01) F16L 39/00 (2006.01)

Patent

CA 1253435

ABSTRACT OF THE DISCLOSURE A riser string for a subsea well uses the outer conduit or air can members to support the weight of the riser string. The outer conduits have flanges on their ends which are bolted together. The outer conduits have ports to admit sea water, and a gas injection system to displace some of the sea water for providing buoyancy. Mounting plates are located at each end of the outer conduits. Inner conduits for conveying well and production fluids are mounted between these mounting plates. The mounting plates are intrinsically curved in vertical cross-section, such that when the conduit flanges are bolted together, the mounting plates flatten to provide a compressive force across the faces. Metal seals are located in the holes provided in the mounting plates for the inner conduits. The inner conduits are supported along their lengths by one or more lateral supports.

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