US 5,180,008 A · Wellhead seal for wide temperature and pressure ranges

Abstract

A wellhead seal for establishing and maintaining a seal between a wellhead and inner pipe element. The seal is an annular elastomeric body having an inner axial surface with a generally convex central portion for pressing against the inner pipe element surrounded by the wellhead and an outer axial surface with a generally concave central portion which, in one embodiment, receives an annular energizing element to increase the sealing force between the body and casing. An annular anti-extrusion ring is provided at the inner edge of each radial end surface.

Claims7

Dependent claims

A wellhead seal for wide temperature and pressure ranges, said seal comprising an assembly of

a) an annular elastomeric body having two flat radial end surfaces, an inner axial surface with a generally convex central portion, and an outer axial surface with a generally concave central portion;
b) a helically coiled annular anti-extrusion ring at the inner edge of each radial end surface where that surface intersects said inner axial surface;
and
c) an annular energizing element fitted around and residing against said outer axial surface of said body.

1 more element

Dependencies are inferred from the claim text.

Wellhead seal for wide temperature and pressure ranges

Life of this patent

Wellhead seal for wide temperature and pressure ranges

Life of this patent

Abstract

Claims7