Riser system for sub-sea wells and method of operation

Details Riser system for sub-sea wells and method of operation Riser system for sub-sea wells and method of operation

1999-02-03

2000-12-19

Lillis, Eileen D.

Wells

Submerged well

Means removably connected to permanent well structure

166367, 4052242, 405167, 4051683, F21B 1701

Patent

active

061616192

ABSTRACT:
An intervention riser for an oil or gas well, which forms a connection between the well head and a floating surface vessel, is sufficiently flexible to accommodate the relative vertical movement between and the well head and a floating surface vessel, is attached to a compensating deck on the vessel which is free to move vertically relative to the vessel, and has winching means having a winch line attached to the riser such that the winching means may pull upon the riser. The compensating deck comprises a deck surface supported on at least one vertically arranged gantry support. The riser system comprises a lower riser section which extends substantially vertically and is essentially rigid, being maintained under tension, and a flexible upper riser section to accommodate movements in the surface vessel.

REFERENCES:
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patent: 3918379 (1975-11-01), McNary
patent: 3999617 (1976-12-01), Iifrey et al.
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patent: 4647255 (1987-03-01), Pow
patent: 4662786 (1987-05-01), Cherbonnier
patent: 4730677 (1988-03-01), Pearce et al.
patent: 5778981 (1998-07-01), Head
patent: 5960885 (1999-10-01), Edwards et al.

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