Dennis Keith Warren

US Patent:

45124060, Apr 23, 1985

Filed:

Jun 7, 1982

Appl. No.:

6/385705

Inventors:

Roy R. Vann - Katy TX
Flint R. George - Katy TX
Dennis F. Warren - Albuquerque NM

Assignee:

GEO Vann, Inc. - Houston TX

International Classification:

E21B 43116
E21B 4326

US Classification:

166297

Abstract:

A vent assembly is positioned downhole in a borehole in underlying relationship with respect to a packer device. The vent assembly is connected within a production tubing string and a perforating gun is supported by the lower end of the string. A bar of special design is dropped down through the interior of the tubing and falls through the vent assembly and continues to fall down the tubing string to impact against a gun firing head. The action of the bar passing through the vent assembly moves structures associated therewith to cause a port to assume an open position. The subsequent impact of the bar against the gun firing head detonates the shaped charges of the gun. Formation fluid is then free to flow into the perforations, up the lower annulus, into the port of the vent assembly, and up the production tubing to the surface of the ground.