Flotation riser

Wells – Submerged well – Submerged – buoyant wellhead or riser

Patent

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Details

166367, 405195, 405171, E21B 712

Patent

active

046468404

ABSTRACT:
A flotation riser having a series of annular chambers with a riser string extending in free-standing relation through said chambers, means for supplying gas to the chambers to control buoyancy, means to supply gas to a plurality of the lowermost chambers to provide an emergency supply of deballasting gas, and means for remotely releasing said supply of gas into the chambers above to render the flotation riser free-standing to permit release from the floating platform during emergencies. A method of storing emergency deballasting gas and for emergency deballasting of the chambers to render the flotation riser freee-standing including the steps of supplying gas to the lowermost chambers, retaining the gas in said lowermost chambers, and remotely releasing the gas and conducting it to higher chamber to deballast such chambers sufficient so that said flotation riser is free-standing.

REFERENCES:
patent: 3017934 (1962-01-01), Rhodes et al.
patent: 3858401 (1975-01-01), Watkins
patent: 4040264 (1977-08-01), Neilon
patent: 4102142 (1978-07-01), Lee
patent: 4176986 (1979-12-01), Taft et al.
patent: 4422801 (1983-12-01), Hale et al.
patent: 4470722 (1984-09-01), Gregory

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