Patent ID: 8851182
Filing Date: 2014-10-07
Classification: E21B

Abstract:
1. An apparatus for installation of a casing string in a wellhead comprising a wellhead bore using a running tool, the apparatus comprising: an energizing ring rotatable by the running tool; a loading ring threaded into an energizing ring interior with a first thread turn in a first direction; a lock ring supported between an energizing ring exterior and the loading ring, the lock ring being moveable between an unset and a set position; a hold-down ring threaded into a loading ring interior with a second thread turn in a second direction opposite the first thread turn first direction, the hold-down ring also comprising an engagement surface for preventing rotation of the hold-down ring and restraining rotation of the loading ring; wherein the lock ring is moveable into bi-directional supporting engagement with the wellhead in the set position upon rotation of the energizing ring in a rotational direction to move the loading ring axially into the energizing ring; and wherein the hold-down ring is moveable axially out of the loading ring upon rotation of the loading ring in the rotational direction by the energizing ring.