Pressure relief system for down hole chemical cutters

Details Pressure relief system for down hole chemical cutters Pressure relief system for down hole chemical cutters

1987-09-01

1989-04-11

Massie, Jerome W.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 55, 166 63, E21B 2902

Patent

active

048197289

ABSTRACT:
An improvement in chemical cutting apparatus for use down within a well bore comprising an automatic means of pressure relief, whereby the anchoring mechanism of the apparatus is disengaged automatically when a clogging of the chemical discharge ports or other malfunction occurs, which pressure relief prevents the cutting tool from becoming stuck down in the hole. The automatic means includes a pressure relief port in the form of an axial bore from the exterior of the assembly to the anchor slip chamber, situated in such a manner that the inside pressure of the cutting apparatus does not communicate with the exterior, until the anchor slip becomes erect. The relief also includes an expendable plug and "O" ring assembly, which acts to prevent clogging of the relief port prior to firing of the cutting apparatus. The pressure relief is made small enough and is so located to prevent it from interfering with the normal operation of the cutting tool, but nonetheless is effective in relieving the built-up high internal pressure when the tool malfunctions.

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