ROCK CUTTING TOOL Russian patent published in 2019 - IPC E21B7/00 E21B10/42 E21B11/00 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the oil and gas industry. Rock cutting tool comprises annular hollow body with outer and end blades in which well and core-forming cutters are fixed, and central core-forming hole made in lower part of housing, flushing system for its cooling and cleaning face from slime with liquid flow. In the upper part of the body there is a thread for connection with a screw-type face-well engine or drill pipes. Inner part of the body is equipped with a non-axisymmetric surface inclined relative to the rock destruction tool axis, in which holes of the flushing system are made. Inner diameter of housing has grooves in axial direction for flushing liquid. Radial cutters are additionally installed between the holes of the flushing system.

EFFECT: higher efficiency and reliability of drilling wells in strong and very strong rocks, especially in directional drilling.

5 cl, 2 dwg