Geometrical instruments
Patent
1978-03-17
1980-04-22
Cherry, Johnny D.
Geometrical instruments
166240, 285360, 294 8626, 403353, E21B 2300, H01R 1354
Patent
active
041992105
ABSTRACT:
Method and apparatus for effecting perforation of a well casing with a casing gun while maintaining pressure in the well bore at a lower level than the pressure in the surrounding reservoir at the point of perforation. Before production tubing is run into the well, the casing gun is deposited in the bore below the desired production level. After the tubing is installed, borehole pressure is reduced to the desired level by swabbing the tubing and an automatic coupling and decoupling pickup tool is lowered on a wireline through the tubing and attached, mechanically and electrically, to the casing gun. The casing gun is then raised to the production level, as measured by locating the casing collars. When the gun is properly located, it is activated through an electrical cable carried along with the wireline. The casing gun perforates the well casing and surrounding formation, and is then decoupled from the wireline to be left in the well.
REFERENCES:
patent: 2250463 (1941-07-01), Boynton
patent: 2799344 (1957-07-01), Muse
patent: 3211479 (1965-10-01), Brown
patent: 3378811 (1968-04-01), Cullen et al.
patent: 3976347 (1976-08-01), Cooke et al.
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