Piston sleeve valve for use with oilfield fishing operations

Details Piston sleeve valve for use with oilfield fishing operations Piston sleeve valve for use with oilfield fishing operations

1995-04-11

1996-08-27

Buiz, Michael Powell

Wells

Valves, closures or changeable restrictors

Fluid operated

E21B 3400

Patent

active

055491634

ABSTRACT:
An oilfield piston sleeve valve for signaling positive engagement of a drill string with a downhole tool during fishing operations is disclosed. The piston sleeve valve is attached to the bottom of a drill string and to a retrieving tool allows drilling fluid to circulate freely through the drill string as long as there is no load on the fishing tool. As soon as the fishing tool engages and when the drill string is lifted upwards the piston sleeve valve cuts or reduces the circulation creating a pressure pulse at the surface. The device is designed to be used for wireline retrieval or in conjunction with retrievable wellbore deviation apparatus.

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