Pressure activated well perforating technique

Details Pressure activated well perforating technique Pressure activated well perforating technique

E - Fixed Constructions

21

B

166/11

E21B 29/02 (2006.01) E21B 43/1185 (2006.01)

Patent

CA 1209030

ABSTRACT OF THE DISCLOSURE A well perforating technique utilizes a predetermined pressure difference developed at different points in the borehole to actuate the firing mechanism of a tubing conveyed perforating gun. A first embodiment incorporated as part of a well test string includes a packer for isolating a wellbore interval and a perforating gun connected in the string below the packer which is fired in response to development of a greater pressure in the annulus above the packer than in the isolated interval, thereby causing perforation at "underbalanced" conditions. A modified "full-bore" embodiment has an annular configuration firing mechanism as part of a tubing string and fires the perforating gun in response to development of a predetermined difference between the pressures at a point in the annulus and a point in the central bore of the tubing string.

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