Self-standing marine riser

Details Self-standing marine riser Self-standing marine riser

E - Fixed Constructions

21

B

166/51.4

E21B 33/035 (2006.01)

Patent

CA 1163552

A B S T R A C T "Self-standing marine riser" A self standing marine riser is provided which comprises a base, a riser column, a flexible joint between the base and the riser column, and means for providing a loose coupling between the top of the riser column and a vessel, rig or platform on the surface above the location of the riser. The riser column comprises an upper column section which includes at least one buoyancy chamber, and a lower, relatively slender column section. The riser includes, or is adapted to support, at least one conduit for the conveyance of a fluid (e.g. oil or gas) or a control line. The buoyancy provided by the upper section of the riser column is preferably variable, and this facilitates the connection and use of the riser. The riser may be used for drilling operations or for production operations. By employing a riser in accordance with the invention, is is not necessary to use large riser tensions in order to maintain the position and structural integrity of the riser in deep water and rough weather.

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