Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1991-04-10
1993-03-09
Dang, Hoang C.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166 551, 175 452, 175 456, E21B 43116
Patent
active
051919362
ABSTRACT:
In the representative embodiment of the method and apparatus of the invention which are disclosed herein, a well tool arranged for suspension in a well bore from a cable includes a mandrel that is telescopically arranged on the tool body and is operable after the tool is stationed in a well bore to be shifted upwardly and downwardly by the cable. A pressure-responsive actuator is arranged on the tool for being released in response to an initial downward movement of the suspension cable for rapidly extending an anchor on the tool body into engagement with the well casing. Thereafter, a successive upward movement of the suspension cable is effective for releasing the pressure-responsive actuator for slowly traveling to a position in the tool body where a firing pin on the body is released for detonating an impact-actuated explosive device on the tool only after a predetermined time delay following the upward cable movement. Subsequent cable movements are operative for thereafter disengaging the anchor to enable the tool to be recovered from a well bore wall.
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Edwards A. Glen
Huber Klaus B.
Miszewski Antoni K. L.
Bouchard John H.
Dang Hoang C.
Garrana Henry N.
Schlumberger Technology Corporation
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