Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1983-03-17
1985-12-24
Novosad, Stephen J.
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
175 452, 175 454, 166297, E21B 43116
Patent
active
045600007
ABSTRACT:
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.
REFERENCES:
patent: Re29638 (1978-05-01), Nutter
patent: 3011551 (1961-12-01), Young et al.
patent: 3029732 (1962-04-01), Greene
patent: 3189094 (1965-06-01), Hyde
patent: 3530948 (1970-09-01), Garrett
patent: 3800705 (1974-04-01), Tamplen
patent: 4369654 (1983-01-01), Hallmark
Bagnell David J.
Novosad Stephen J.
Schlumberger Technology Corporation
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