| 主权项 |
1. A tie back liner connector assembly, comprising:
a tubular housing having a longitudinal axis and adapted to be coupled to the end of a liner, the tubular housing having at least one interior locking dog window; a setting chamber in the housing; an actuator carried in the housing for axial movement, the actuator having a setting piston within the setting chamber, a cam surface, and an actuating sleeve extending from the setting piston; a retraction chamber in the housing, spaced axially from the setting chamber and having a retracting piston therein; locking dogs movably coupled to the tubular housing for displacement through the at least one locking dog window of the tubular housing, the locking dogs being axially spaced between the setting chamber and the retraction chamber, the locking dogs being in engagement with the cam surface; the actuating sleeve having a plurality of linking element windows, the actuating sleeve having a lower end portion extending into the retraction chamber in engagement with the retracting piston; a plurality of linking elements, each having an inner end in engagement with one of the locking dogs and an outer end in engagement with a load shoulder located in the housing, the inner and outer ends being axially spaced from each other for transferring forces on the locking dogs to the housing, the linking elements extending through the linking element windows in the actuating sleeve; and wherein applying fluid pressure to the setting chamber moves the setting piston, the actuating sleeve and the retracting piston in one direction to move the dogs radially inward into a setting position in engagement with a profiled surface on a wellhead, and applying fluid pressure to the retraction chamber moves the retracting piston, the actuating sleeve and the setting piston in an opposite direction to release the locking dogs from engagement with the profiled surface on the wellhead. |
