Wear bushing for locking to a wellhead

A wear bushing for a subsea well assembly including a wellhead housing and a casing hanger within the wellhead housing and supporting a casing string, the wear bushing positioned downhole on a running tool, 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 to 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 with the connector in response to actuation of the running tool, 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 running tool includes a piston movable in response to fluid pressure in the running tool to actuate the bushing/wellhead housing connector.

A method of minimizing wear within a subsea well assembly including a wellhead housing, and a casing hanger within the wellhead housing and supporting a casing string, the method comprising:

• landing a wear bushing on the casing hanger to minimize damage to the wellhead housing, the casing hanger, and the casing string during rotation of a drill string;
• rotating the drill string within the wear bushing;
• providing a connector for axially connecting the wear bushing and the wellhead housing;
• actuating a running tool to connect the wear bushing and the wellhead housing with the connector, such that at least a portion of the connector is received within 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 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 running tool includes a piston movable in response to fluid pressure in the running tool to actuate the bushing/wellhead housing connector.