PUNCHING PERFORATOR Russian patent published in 2009 - IPC E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to construction and repair of oil, gas and other wells and can be implemented at emergency works for circulation restoring. The punching perforator consists of a case, and of a spring loaded couple piston-plunger creating above- and under- plunger space in the case. The perforator also consists of a working piston in under-plunger space with a punching tool installed therein, of a power drive supplying working fluid, the drive is made in form of a pipe pressure tight assembled on the case; the pipe has an instrument head and a tubular electric heater installed inside the pipe, further the perforator consists of a switcher assembled between the case and the power drive hydraulically connecting above-piston space and the cavity of the power drive pipe, and of a feeding cable. The power drive is arranged inside the heat insulated case creating pressure tight cavity between them. In the upper part of the tubular electric heater designed to rotate axially there is installed a conductor contacting a clutch. The clutch is electrically connected to the feeding cable. In the lower part of the tubular electric heater there is assembled a case with a thrust land inside of which there is installed a rod with an overrun limiter; the rod is rigidly connected to the couple piston-plunger.

EFFECT: creating high efficient punching perforators automatically switched off after punching hole.

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