CUMULATIVE CHARGE OF PERFORATOR Russian patent published in 2011 - IPC E21B43/117 F42B1/28 

FIELD: oil and gas production.

SUBSTANCE: cumulative charge of perforator consists of case where in there is arranged axisymmetrical blasting cartridge of explosive substance with open cavity. Also, a cumulative coating adjoins surface of the cavity. The coating consists of conical and spherical or elliptical cumulative sections conjugated to each other. The conic cumulative section corresponds to a top of the cumulative coating, while spherical or elliptical cumulative section has lengthwise cumulative grooves.

EFFECT: increased inflow of oil or gas into cavity of pipe of well due to increased specific area of opening of casing at maintaining sufficient depth of perforation.

2 dwg