Wellhead seals

Details Wellhead seals Wellhead seals

E - Fixed Constructions

21

B

166/62

E21B 33/03 (2006.01) E21B 33/04 (2006.01) F16J 15/48 (2006.01) E21B 33/00 (2006.01)

Patent

CA 1281282

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 down- wardly 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.

556285

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