HYDROMECHANICAL GUN PERFORATOR Russian patent published in 2008 - IPC E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the devices for fissure perforating in casing pipes. The hydromechanical gun perforator contains the composed body, the mandrel sub with the circulation valve, the cutting block with the crush roll and sliding support. Inside two cylinders, the tubular rod, which is fixedly connected to the ramming piston of the upper cylinder and to the puller of the lower hydrocylinder, is installed. At that, at the lower part of the mandrel sub, the fishing tool of the circulation valve is installed. The sliding support of the cutting block is provided with the hard-alloy elements. The rod is supplied with the compensatory sub which leaklessly divides the hydrocylinders and is installed into the parting body wall so as to enable its radial relocation. The front sliding surfaces of the compensatory sub are supplied with the sealing elements. The upper hydrocylinder's piston is spring-loaded with a couple of springs, and the supporting dish is placed between the springs and the upper hydrocylinder's piston. A spring is installed also in the lower hydrocylinder.

EFFECT: enhancement of hydromechanical gun perforator.

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