Hydraulic/torsion packoff installation tool and method of using same.

摘要

An improved wellhead annulus seal installation tool (120) and preload retention means is disclosed particularly adapted for metal-to-metal seals. The seal installation tool includes a telescoping mandrel (122, 124) with a torsion spring (198) attached and a torque sleeve (126) rotatably mounted thereon with means for limiting the rotation of the torque sleeve, seal means (130) for sealing the lower portion of the tool inside the hanger and means for transmitting the torque and axial movement of the tool to the preload retention means. The preload retention means includes an upper body with an annulus sealing means therebelow and a driving ring (90) threaded thereon. An expansible lock ring (86) is carried on the driving ring (90) with an expander ring (88) thereabove with means for coacting with the seal installation tool and thereby locking the seal means (58) inside a wellhead.