Deepwater riser system

Details Deepwater riser system Deepwater riser system

1997-12-23

2000-12-19

Lillis, Eileen D.

Wells

Submerged well

Riser

166359, 4051951, 405224, E21B 1701, E21B 712

Patent

active

061616206

ABSTRACT:
A deepwater riser assembly is disclosed for a riser connecting subsea equipment to a surface wellhead. A buoyancy can assembly provides an open ended buoyancy can tube which surrounds the upper end of the riser and an upper seal which effectively closes the annulus between the riser and the buoyancy can tube. A load transfer connection in the buoyancy can assembly then connects the riser to buoyancy can tube. A pressure charging system communicates with the annulus between the riser and the buoyancy can tube below the upper seal. Injecting gas into this annulus then provides support to the riser.

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