Release apparatus and method for threaded conductor pipe

摘要

A torque tool and mating profile allow large diameter conductor pipe to easily be retrieved from a subsea well. The profile will be located near the sea floor immediately above a left-hand threaded connector joint. The profile has a lifting shoulder and a torque key. The torque tool lowers through the conductor pipe from the drill rig on drill pipe. It has spring biased dogs that spring outward into the profile. The dogs have lifting surfaces for lifting the conductor string at the lifting shoulder at the profile. Rotating the torque tool causes it to engage the torque key to break out the connector joint.