Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1988-12-05
1990-05-29
Dang, Hoang C.
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
166 553, 166223, 175 78, 175 79, E21B 43112, E21B 718
Patent
active
049287575
ABSTRACT:
A well casing penetrator includes an elongated housing having a work fluid input chamber and enclosing an outwardly movable hydraulic cylinder driven punch for cutting an opening in a casing. A high pressure liquid jet nozzle is mounted on the end of a lance-like hose having a nozzle on its outer end which is moved outwardly or inwardly through an axial bore in the punch by a lance drive piston and cylinder assembly with outward movement serving to cut a radially extending opening in the surrounding earth. A moveable valve spool is connected to a coil compression spring which urges the spool toward a first position in the spool directs work fluid to hydraulic punch cylinder and lance drive piston and cylinder assembly so that the punch and lance-like hose are maintained in retracted position. When the pressure in the work fluid input chamber is increased beyond a critical pressure, the force of the spring is overcome and the valve spool shifted to direct work fluid to cause the punch cylinder and the lance drive piston cylinder and cylinder assembly to be activated to extend the punch and lance-like hose while simultaneously supplying high pressure fluid to the lance-like hose and nozzle to initiate a penetration operation. The parts return to their original retracted position upon lowering of the work pressure below the critical pressure.
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McQueen Robert W.
Peters Alan D.
Schellstede Herman J.
Dang Hoang C.
Penetrator's, Inc.
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