Patent ID: 8746352
Filing Date: 2014-06-10
Classification: E21B,F16J

Abstract:
1. A seal assembly for use between wellbore tubulars comprising: an inner seal ring having an inner radial surface and an outer oblique surface profiled oblique to an axis of the tubulars and that intersects the inner radial surface; an outer seal ring having an inner oblique surface profiled oblique to the axis of the tubulars and in sliding contact with the inner seal ring outer oblique surface, so that when the seal assembly is set in an annular space between the tubulars and opposing axial forces are applied to ends of the outer seal ring and inner seal ring, sealing surfaces are formed where an inner radius of the seal assembly contacts an inner tubular and an outer radius of the seal assembly contacts an outer tubular; an anti-extrusion ring assembly on one of the ends of one of the seal rings, the anti-extrusion ring assembly comprising inner and outer members with mating oblique surfaces that slidingly engage each other such that an axial force causes a width of the anti-extrusion ring assembly to expand, the inner and outer members having a lesser axial dimension than an axial dimension of the inner and outer seal rings; and a spring assembly in engagement with an end of the anti-extrusion ring assembly opposite the seal rings for applying an axial force to the anti-extrusion ring assembly.