FIELD: oil and gas production.
SUBSTANCE: device consists of case with connecting threads, central channel and retractable cutting elements. On external surface the case is equipped with upper and lower stops. Cylinder axles are installed between the stops symmetrically relative to axis of the case. Cutting elements are made in form of loads with cutters on external surface. The cutting elements have holes for corresponding cylinder axles; the loads are spring loaded to inside and rotate; their rotation under centrifugal force is restricted with the regulated stop. The upper and lower stops are equipped with through washing holes.
EFFECT: expanded process functionality and increased service life of device.
2 cl, 3 dwg
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