Patent ID: 9347291
Filing Date: 2016-05-24
CPC Classification: E21B

Claim Text:
1. A seal assembly for sealing a casing annulus in a subsea wellhead having a radially internal recess therein and a casing hanger positioned within the wellhead including a radially external recess therein, the seal assembly comprising: a seal body supporting one or more radially internal seals and one or more radially external seals; an actuation sleeve axially movable with respect to the subsea wellhead in response to a running tool; a first locking member radially movable by the actuation sleeve to move into the internal recess in the wellhead to axially connect the seal body and the wellhead; a second locking member radially movable by the actuation sleeve to move into the external recess in the casing hanger to axially connect the seal body and the casing hanger; upper and lower stops supported on the seal body for engaging each of the first locking member and the second locking member to limit radial movement of the first and second locking members; and wherein the first locking member is a C-shaped locking ring supported on the seal body and radially movable outward to fit within the internal recess in the wellhead.