Release apparatus and method for threaded conductor pipe

Details Release apparatus and method for threaded conductor pipe Release apparatus and method for threaded conductor pipe

1990-04-16

1991-01-22

Novosad, Stephen J.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166 775, 166365, 166377, 285 39, E21B 1916

Patent

active

049863592

ABSTRACT:
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.

REFERENCES:
patent: 1142460 (1915-06-01), Roby
patent: 2924434 (1960-02-01), Potter et al.
patent: 3171674 (1965-03-01), Bickel et al.
patent: 3240511 (1966-03-01), Bishop et al.
patent: 4003434 (1977-01-01), Garrett et al.
patent: 4688632 (1987-08-01), Cooley, Jr.
patent: 4830121 (1989-05-01), Krasnov et al.

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