External Locking Mechanism for Seal Energizing Ring

摘要

A wellhead housing has a bore with a Sanding shoulder aid an annular retaining groove spaced above the landing shoulder. A casing hanger connects to a string of easing and lands on the landing shoulder. A seal assembly between the hanger and an interior side wall of the wellhead housing below the retaining groove has an energizing ring that moves axially downward relative to the seal member to a set position that causes the seal member to sealingly engage the hanger and the interior side wall. A lockdown member has an outer lower end portion that bears against an upper end of the energizing ring and an inner lower end portion that hears against an upper end of the hanger. A lockdown ring mounted to the lockdown member engages the retaining groove to prevent upward movement of the lockdown member.

主权项

1. A wellhead apparatus comprising:
an outer wellhead member having a bore with an axis; a hanger landed in the bore; a seal, assembly between the hanger and an interior side wall of the outer wellhead member, she seal assembly having an energizing ring that moves axially downward relative to the hanger to a set position that causes the seal assembly to set; and a lockdown member secured in the bore against axial movement, the lockdown member having a lower end that bears against m upper end of the energizing ring while the energizing ring is in the set position.