FIELD: oil and gas industry.
SUBSTANCE: device contains a case, wedge with grooves, at least two hydraulic motors placed one by one which have spring-loaded pistons and at least two cutters with hydraulic monitors and cutter holders installed in grooves of its support and wedge and capable of radial reciprocating movement. The case is formed by the wedge and walls of hydraulic motors which piston rods have axial channel connected by overflow channels with cavities under pistons and by tubes and channels of cutter holders with hydraulic monitors of cutters. Support of cutter holders is connected to piston rod which is loaded by a spring downwards in regard to the hydraulic motor.
EFFECT: improvement in efficiency of productive stratum treatment at reduction of metal consumption and material costs.
1 dwg
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