FIELD: mining.
SUBSTANCE: group of inventions relates to drilling and operation of wells. Perforator includes a housing, a plunger, a piston with the possibility of radial movement in the piston chamber, a punch with a central channel, at the output of which there is at least one profiled jet nozzle.
EFFECT: piston chamber can have a closed hydraulic connection with an under-plunger cavity, and the above-plunger cavity communicates with the jet nozzle after mechanical opening of the wall of the casing string.
7 cl, 4 dwg
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