Wellhead seals

Details Wellhead seals Wellhead seals

1987-04-30

1988-09-20

Dang, Hoang C.

Wells

Central chamber sealed with respect to prepositioned...

166182, 166187, 166202, 277 27, 277236, 285 95, 285139, E21B 3303

Patent

active

047718285

ABSTRACT:
A seal assembly for sealing across the annulus in a subsea wellhead having pressure enhancement provided behind at least one of the sealing surfaces to ensure a positive metal-to-metal sealing. In the preferred form of the invention the seal assembly includes upper sealing lips which diverge upwardly away from each other into sealing engagement with the sealing surfaces against which they are to seal, lower sealing lips which diverge downwardly away from each other into sealing engagement with the sealing surfaces against which they are to seal, and a rim secured to one of the wellhead members and space therefrom to provide a recess behind the rim and open to pressure which is directed toward the sealing lip which is to seal against such sealing surface to provide a pressure energized enhancement of the sealing engagement of the lips against said sealing surface. In other forms of the invention at least one of the rims may be used.

REFERENCES:
patent: 1336738 (1920-04-01), Fletcher
patent: 1983938 (1934-12-01), Humason et al.
patent: 2075899 (1977-04-01), Humason
patent: 2405152 (1946-08-01), Kilchenmann
patent: 2746486 (1956-05-01), Gratzmuller
patent: 3279806 (1966-10-01), Bialkowski
patent: 4302018 (1981-11-01), Harvey et al.
patent: 4595053 (1986-06-01), Watkins et al.
patent: 4641841 (1987-02-01), Regan

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