POSITIVE RETENTION LOCK RING FOR TUBING HANGER

摘要

A wellhead assembly includes a wellhead housing with a bore and an annular lock groove on an inner diameter surface of the bore. A wellbore member is concentrically located within the bore of the wellhead housing, defining an annulus between the wellbore member and the wellhead housing. An annular lock ring is positioned in the annulus. The annular lock ring has an outer diameter profile for engaging the lock groove and is radially expandable from an unset position to a set position. An energizing ring is positioned in the annulus to push the lock ring outward to the set position as the energizing ring moves downward. A retainer selectively engages the energizing ring and limits axial upward movement of the energizing ring relative to the wellbore member, retains the annular lock in the set position, and prevents axial upward movement of the wellbore member relative to the wellhead housing.