Patent ID: 6823938
Filing Date: 2004-11-30
Classification: E21B

Abstract:
An apparatus for installing a string of casing in a well, comprising:a wellhead assembly having a landing shoulder and a profile located above the landing shoulder; a casing hanger that lands on the landing shoulder of the sub for supporting the string of casing; a running mechanism releasably secured to the casing hanger for landing the casing hanger and setting a casing hanger seal; a body adapted to be carried above the running mechanism by a running string of conduit; a plurality of dogs mounted to the body and movable into an engaged position in engagement with the profile, wherein while in the engaged position, the dogs resist upward movement of the casing hanger during cementing of the string of casing; a mandrel that extends through the body, the mandrel having a threaded connection for connecting to the running string, the mandrel being axially movable relative to the body; wherein the body has an upper portion and a lower portion, the lower portion being secured to the running mechanism and rotatable relative to the upper portion; wherein axial movement of the mandrel relative to the body causes the dogs to move to the retracted and extended positions; and wherein the mandrel is rotatable relative to the upper portion of the body and rotates in unison with the lower portion of the body to transmit rotation of the running string to the running mechanism.