Casing hanger packoff with C-shaped metal seal

Details Casing hanger packoff with C-shaped metal seal Casing hanger packoff with C-shaped metal seal

1988-02-03

1989-06-27

Neuder, William P.

Wells

Central chamber sealed with respect to prepositioned...

166208, 285348, E21B 1708

Patent

active

048420611

ABSTRACT:
A packoff for a casing hanger for a subsea wellhead employs a one piece metal part with ancillary elastomer seals. A C-shaped metal seal links external metal lips. A locking section is located above the packoff. The locking section has a neck that allows it to buckle under sufficient downward force. When it deflects, a primary locking shoulder engages a locking shoulder of the casing hanger. At the same time, a secondary locking shoulder on the outer side of the locking section locks to a shoulder on the outer side to prevent the locking section from moving out of the locked position when an upward test pull is exerted.

REFERENCES:
patent: 3797864 (1974-03-01), Hynes et al.
patent: 4488740 (1984-12-01), Baugh et al.
patent: 4496172 (1985-01-01), McEver et al.
patent: 4634152 (1987-01-01), Pettit
patent: 4651618 (1987-03-01), Johnson et al.
patent: 4665979 (1987-05-01), Boehm, Jr.
patent: 4681350 (1987-07-01), Gaita
patent: 4719971 (1988-01-01), Owens

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