FIELD: oil and gas extractive industry.
SUBSTANCE: device has hydraulic cylinder with spring-loaded piston and hollow rod connected to cutting assembly. The latter has cutting disk on axis placed in bushing groves. Axis ends are placed in guiding plates grooves, which plates are mounted in device body. Hydraulic-monitoring end piece is placed above disk and directed to longitudinal grove in body. Support screw-thread dies are placed oppositely to cutting disk. Hydraulic cylinder piston is provided with stop limiting its drive. Hydraulic-monitoring end piece is covered by bushing fixed by shear pin with socket for ball. Support dies are made projecting, mounted with possible displacement until stopped against column. Grooves in bushing for axis of cutting disk are made in form of broken line with different slant angle relatively to vertical axis of device.
EFFECT: higher reliability.
3 cl, 5 dwg
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