Patent ID: 8695700
Filing Date: 2014-04-15
Classification: E21B

Abstract:
1. A wellhead assembly with an axis, comprising: an outer wellhead member having a bore; an inner wellhead member adapted to be located in the bore; opposing seal surfaces in the bore and on an exterior portion of the inner wellhead member; a seal ring between the inner and outer wellhead members having an inner annular member and an outer annular member circumscribing a portion of the inner annular member, wherein the seal ring comprises a downward extension extending from below the outer annular member of the seal ring; an annular energizing ring having a lower end insertable between the inner and outer annular members of the seal ring, so that when the lower end of the energizing ring is inserted between the inner and outer annular members of the seal ring, outer walls of the inner and outer annular members of the seal ring are urged radially outward into sealing engagement with the inner and outer wellhead members; an annular extension extending downwards and located below the seal ring, the extension having a lower surface for landing on a portion of the inner wellhead member and having an upward facing shoulder in contact with the inner annular member of the seal ring to prevent downward deflection of the inner annular member as the energizing ring is inserted between the inner and outer annular members of the seal ring; and a locking member having at least a portion retained within a recess formed in an upper interior portion of the annular extension to hold the seal ring to the annular extension and allow for axial movement of the annular extension relative to the downward extension of the seal ring.