Method and apparatus for perforating well bores using...

Details Method and apparatus for perforating well bores using... Method and apparatus for perforating well bores using...

E - Fixed Constructions

21

B

166/12

E21B 29/02 (2006.01) E21B 34/10 (2006.01) E21B 43/116 (2006.01) E21B 43/1185 (2006.01)

Patent

CA 1303970

ABSTRACT A method and apparatus for perforating oil well casing in a well bore, with particular advantage in highly deviated well bores. The perforating guns are run into the well bore using the production tubing. A sliding sleeve is connected in the tubing above the guns and a packer is run in for setting above the sliding sleeve and guns. The assembly is run into the well bore until the guns extend into the highly deviated portion of the bore where the well casing is to be perforated. The packer is set into place, isolating that portion of the well bore below the packer from that portion above the packer, and the sliding sleeve is opened using a wireline or other means. The well bore below the packer is pressurized through the tubing to ensure that the packer is properly set, The pressure is then allowed to bleed off and the sliding sleeve is closed. The guns use a differential pressure-actuated firing head which is actuated upon a predetermined differential pressure between the production tubing bore and the annulus between the tubing and the casing. The invention provides the capability of perforating well casing using relatively low values of actuating pressure, providing greater control over perforating conditions such as underbalance.

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