FIELD: oil and gas extracting industry. SUBSTANCE: device has composite body, telescopic cutting tool in form of knurl, which is mounted in guides, mechanism for conveying cutting tool, circulation valve and hydraulic monitoring nozzle. In the knurl radial grooves are made on the cutting edge. They are placed along a circle. Entrance edge of channel of hydraulic monitoring nozzle is made with curvature, radius of which is equal to thickness of its wall. EFFECT: higher reliability, effectiveness and time savings for device preparation. 2 cl, 5 dwg
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