Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1982-09-28
1986-03-18
Novosad, Stephen J.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166299, 166373, E21B 43112
Patent
active
045762333
ABSTRACT:
A differential pressure actuated vent assembly is connected into an oil well tool string. In one form of the invention, the tool string includes a packer device, a perforating gun attached to the lower end of the tubing string, with the vent assembly being interposed between the gun and the packer device. Fluid pressure within the tubing string is effected on one face of a piston associated with the vent assembly, which reciprocates the piston and communicates the interior of the tubing string with the annulus around the tubing string while carrying out the step of perforating the formation. Movement of the piston and the subsequent detonation of the gun preferably are both accomplished sequentially in response to the dropping of a bar down through the tool string. The bar opens a passageway leading to the piston, and immediately thereafter, before the pressure differential between the interior of the tubing string and the annulus is equalized, the gun is detonated, thereby obviating damage to the formation.
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McCullough Tool Company 1941, 1953, 1955, 1957, and 1960-1961 Catalogues.
Duzan James R.
Flanagan, III Eugene L.
GEO Vann, Inc.
Neuder William P.
Novosad Stephen J.
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