Perforation apparatus and method

Details Perforation apparatus and method Perforation apparatus and method

1986-12-15

1988-07-12

Novosad, Stephen J.

Wells

Processes

Cleaning or unloading well

175 451, 175 452, 175 46, E21B 3700, E21B 43114, E21B 43117

Patent

active

047563710

ABSTRACT:
A perforation apparatus is coupled to a tubing string and is eccentrically positioned in a casing in a well bore by eccentering devices so that annular sealing rings along the length of the apparatus sealingly engage the casing. Shaped charge devices are arranged in pairs so that a pair of shaped charges produces, when detonated, a horizontal and an inclined perforation which intersect in the earth formations behind the casing. One of the perforations extends through a sealing ring to the interior of the perforating apparatus and one of the perforations opens to the casing. By applying differential pressure between the fluid in the casing and the inside of the tubing, for example by running the tubing dry, hydraulic jetting of fluid is produced in one perforation with a fluid return though the other perforation to the tubing string. Thus the penetrations of the shaped charge jet and the hydraulic jet are additive, and the perforation tunnel into the formation is washed free of shaped charge debris and compaction. Numerous perforations can be thus produced simultaneously. With the tool left in place during injection or production, the perforations can be reworked repeatedly by hydraulic jetting.

REFERENCES:
patent: 3347314 (1967-10-01), Schuster
patent: 3447607 (1969-06-01), Harris et al.
patent: 3630282 (1971-12-01), Lanmon
patent: 3707195 (1972-12-01), Lanmon
patent: 4105073 (1978-08-01), Brieger

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