ROTARY DRILL BIT WITH HARD ALLOY BLOCK WITH CUT Russian patent published in 2010 - IPC E21B10/55 E21B10/58 

FIELD: oil-and-gas industry.

SUBSTANCE: rotary drill hard alloy block, contains an extended case, executed with rotation ability around a central axis with two symmetrical relatively to the central axis parts. The extended case has a central cut between two symmetrical parts. Every symmetrical part has a front face and a top surface with a front face and a back face, at that the front and the back faces are neighbouring, but not coplanar. Every half also has a front cutting edge at the front face and front surface top surface crossing. The front surface inclined under the constant angle in radial direction relatively to the first radial line, going from central axis, and the front surface inclined to the bottom and to the back relatively to the front cutting edge.

EFFECT: bit real endurance resource and its penetration rate increase.

28 cl, 9 dwg