ROLLING DRILLING BIT Russian patent published in 2014 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: rolling drilling bit includes cutters with stepped peripheral cutting structure. Relation of sizes of a step and a bit are determined as a/b=0.60-0.70 at a/D=0.023-0.032, where: a - step width; b - step height; D - bit diameter. Such relation provides complete destruction of the step at bottom hole wall during its formation with minimum power consumption thus facilitating operation of peripheral cutting structure and bearings, their wear is diminished with increase of drilling speed to 50% and bit drifting to 80%.

EFFECT: improving operating efficiency of the bit operation.

4 dwg