FIELD: testing equipment. SUBSTANCE: device has wheel installed in cylindrical body and bar kinematically connected with wheel. Bar has appliance for its axial motions. Radially attached to wheel is guide. Installed in guide is punch with appliance for its axial motion. Wheel is rotated by moving bar. Cutter installed on punch end face cuts rock layer by layer of well wall up to complete realization of accumulated energy. EFFECT: higher efficiency. 1 dwg
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