Subsea wellhead protective enclosure

Details Subsea wellhead protective enclosure Subsea wellhead protective enclosure

1978-11-27

1980-09-02

Corbin, David H.

Hydraulic and earth engineering

Marine structure or fabrication thereof

Structure protection

166368, 405222, E02D 3100

Patent

active

042204216

ABSTRACT:
Method and apparatus for protecting subsea wellheads and christmas trees from damage by anchors, fishing nets, trawl boards, and other towed devices. The apparatus includes an annular, rigid protective enclosure with inner and outer walls that define a hollow annular chamber, and a plurality of bag-like containers spaced around and attached to the enclosure's outer wall. The annular chamber is in communication with the interiors of the containers by means of ports through the enclosure's outer wall, whereby when cement is pumped into the chamber it also flows into and fills the containers to form a smoothly contoured shield around the enclosure. Should an anchor or other device become fouled on this shield, the container or containers involved will break away and let the anchor continue on its way up and over the enclosure without damage to the wellhead or other well equipment.

REFERENCES:
patent: 3247672 (1966-04-01), Johnson
patent: 3461957 (1969-08-01), West
patent: 3486341 (1969-12-01), Huesker-Stiewe et al.
patent: 3543846 (1970-12-01), Smith et al.
patent: 3661204 (1972-05-01), Blanding et al.
patent: 3664136 (1972-05-01), Laval et al.
patent: 3703207 (1972-11-01), Horton
patent: 3786640 (1974-01-01), Turzillo
patent: 3910056 (1975-10-01), Dopyera
patent: 3981154 (1976-09-01), Hix
patent: 4081970 (1978-04-01), Dowse

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