Patent ID: 9057238
Filing Date: 2015-06-16
Classification: E21B

Abstract:
1. A tree cap assembly for capping a bore of a subsea wellhead assembly, the bore having an axis, the tree cap assembly comprising: an annular cage member selectively insertable into the bore formed in the wellhead assembly, the annular cage member comprising, sidewalls that define an interior, and a flange that projects radially outward from a terminal end of the sidewalls and selectively land on an upper end of the wellhead assembly; a cam element having a portion positioned in the interior of the cage member and that has a conically shaped outer periphery, the cam element being axially movable with respect to the cage member and the conically shaped outer periphery being in selective contact with the cage member; an annular actuation member on a terminal end of the cage member and which circumscribes a portion of the cam element; an annular seal between the cam element and an inner surface of the bore, the cam element selectively energizing the annular seal by compressing the annular seal axially with the actuation member to form a pressure barrier in the bore; a locking assembly comprising a dog that projects radially outward through a sidewall of the cage member into selective engagement with a groove that circumscribes the bore; and an actuation assembly coupled to the cam element so that when actuated, the actuation assembly moves the cam element axially relative to the annular cage member to compress the seal against the actuation member.