Load enhanced locking arrangement

摘要

In a wellhead near the top of an oil and gas well, a locking profile configured for locking engagement with an inner well member and including a locking ridge having a rib and a locking shoulder. The locking ridge extends radially inward from an inner surface of the wellhead into a well bore. The rib is located on an end of the ridge distal from the wellhead and protrudes into the inner well member. The locking shoulder is located on an end of the ridge distal from the wellhead and adjacent a lower end of the rib, so that as the inner well member exerts an upward force on the rib, the upward force creates a moment in the locking ridge that pushes the locking shoulder into tighter engagement with the inner well member.

主权项

1. A locking profile in a wellhead configured for locking engagement with an inner well member, the locking profile of the wellhead comprising:
a plurality of locking ridges protruding inward toward the axis of a wellbore, each of the plurality of locking ridges separated by a recess and comprising:
a rib and a locking shoulder on an end of the locking ridge distal from the wellhead, the rib for protruding into the inner well member,the locking shoulder immediately adjacent and contacting a lower end of the rib, and having an inner surface oriented substantially parallel to the longitudinal axis of the wellbore, so that as the inner well member exerts an upward force on the rib, the upward force creates a moment in the locking ridge that pushes the locking shoulder into tighter engagement with the inner well member.