| 主权项 |
1. A wear bushing and retrievable running tool for a subsea well assembly including a wellhead housing and a casing hanger within the wellhead housing and supporting a casing string, comprising:
the wear bushing for landing on the casing hanger to minimize damage to the wellhead housing, the casing hanger and the casing string during rotation of a drill string; a bushing/wellhead housing connector supported on the wear bushing for axially connecting the wear bushing and the wellhead housing; the retrievable running tool actuated to connect the wear bushing and the wellhead housing with the connector, such that at least a portion of the connector is received with a corresponding recess in an interior wall of the wellhead housing; wherein the wear bushing includes an inner sleeve connected to a body of the wear bushing by a plurality of shear pins, the shear pins providing a releasable, second connection between the wellhead housing and the wear bushing that allows release of the wear bushing from the wellhead housing in the event the bushing/wellhead housing connector cannot release, the wear busing minimizing damage to the well housing, the casing hanger, and the casing string when the drill string rotates within the wear bushing; and wherein the retrievable running tool includes a piston movable in response to fluid pressure in the running tool to actuate the bushing/wellhead housing connector. |
