Lock ring and packoff for wellhead

Abstract

A packoff and a locking assembly installed in a bore of a wellhead component are provided. In one embodiment, a packoff includes inner and outer annular seals and an energizing ring shaped to be wedged between the inner and outer annular seals so as to apply a radially inward biasing force on the inner annular seal and a radially outward biasing force on the outer annular seal. In another embodiment, a locking assembly includes a lock ring that extends into a recess in a wall of the bore of the wellhead component and an actuator radially disposed between an inner component within the bore and the lock ring to retain the lock ring within the recess. The actuator can have an interference fit with the inner component to inhibit movement of the actuator between the lock ring and the inner component. Additional systems, devices, and methods are also disclosed.

1 . A system comprising:
 a wellhead component having a bore;   an inner component disposed within the bore of the wellhead component;   a locking assembly disposed within the bore between the inner component and the wellhead component to secure the inner component within the bore of the wellhead component, the locking assembly including:
 a lock ring that extends into a recess in a wall of the bore of the wellhead component; and 
 an actuator radially disposed between the inner component and the lock ring to retain the lock ring within the recess; 
 wherein the actuator has an interference fit with the inner component to inhibit movement of the actuator between the lock ring and the inner component; and 
   a packoff disposed in the bore of the wellhead component, the packoff including:
 an inner annular seal; and 
 an outer annular seal. 
   
     
     
         2 . (canceled) 
     
     
         3 . The system of  claim 1 , wherein the inner annular seal has a pair of arms that extend radially inward and the outer annular seal has a pair of arms that extend radially outward to facilitate sealing of an annular space by the packoff. 
     
     
         4 . The system of  claim 1 , wherein the inner annular seal is concentric with the outer annular seal. 
     
     
         5 . The system of  claim 4 , wherein the inner annular seal is axially aligned with the outer annular seal. 
     
     
         6 . The system of  claim 1 , wherein the packoff includes a landing ring. 
     
     
         7 . The system of  claim 6 , wherein the landing ring is positioned within the bore on the actuator of the locking assembly. 
     
     
         8 . The system of  claim 6 , wherein the packoff includes a retaining ring between the landing ring and the inner annular seal. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . The system of  claim 1 , wherein the inner component is a hanger. 
     
     
         12 . The system of  claim 1 , wherein the locking assembly includes a load ring between the lock ring and a shoulder of the inner component. 
     
     
         13 . The system of  claim 1 , wherein the lock ring cooperates with the recess in the wall of the bore to preload the inner component. 
     
     
         14 . The system of  claim 1 , wherein both the locking assembly and the packoff are configured to be axially set in the bore without rotation. 
     
     
         15 - 20 . (canceled) 
     
     
         21 . A system comprising:
 a wellhead component having a bore;   an inner component disposed within the bore of the wellhead component; and   a locking assembly disposed within the bore between the inner component and the wellhead component to secure the inner component within the bore of the wellhead component, the locking assembly including:
 a lock ring that extends into a recess in a wall of the bore of the wellhead component; and 
 an actuator radially disposed between the inner component and the lock ring to retain the lock ring within the recess; 
 wherein the actuator has an interference fit with the inner component to inhibit movement of the actuator between the lock ring and the inner component. 
   
     
     
         22 . The system of  claim 21 , wherein the inner component is a hanger. 
     
     
         23 . The system of  claim 21 , wherein the locking assembly includes a load ring between the lock ring and a shoulder of the inner component. 
     
     
         24 . The system of  claim 21 , wherein the lock ring cooperates with the recess in the wall of the bore to preload the inner component. 
     
     
         25 . The system of  claim 21 , wherein the locking assembly is configured to be axially set in the bore without rotation. 
     
     
         26 . A method comprising:
 inserting a locking assembly into a bore of a wellhead component, the locking assembly including a lock ring and an actuator for controlling the radial position of the lock ring;   positioning the locking assembly so as to be radially between the wellhead component and an inner component also present within the bore of the wellhead component; and   axially setting the locking assembly, wherein axially setting the locking assembly includes applying an axial force to the actuator to move the actuator to a locked position in which the actuator is wedged behind the lock ring, moving the actuator to the locked position causes the lock ring to move radially to extend into a mating recess, and the actuator is retained in the locked position with an interference fit.   
     
     
         27 . The method of  claim 26 , wherein applying the axial force to the actuator to move the actuator to the locked position includes applying the axial force to the actuator so as to wedge the actuator between the lock ring and the inner component, the wellhead component includes the mating recess, and moving the actuator to the locked position causes the lock ring to move radially to extend into the mating recess in the wellhead component. 
     
     
         28 . The method of  claim 26 , wherein applying the axial force to the actuator includes applying the axial force to the actuator from a running tool. 
     
     
         29 . The method of  claim 26 , comprising unlocking the locking assembly, wherein unlocking the locking assembly includes axially pulling the actuator from behind the lock ring to allow the lock ring to relax and exit the mating recess.