DISC DRILLING BIT Russian patent published in 2007 - IPC E21B10/12 

FIELD: rock-cutting tools, particularly disc drilling bits adapted to drill all-purpose wells.

SUBSTANCE: drilling bit comprises U-shaped body and pin secured in the body. Drilling bit has disc cutters and annular thrusts installed on the axis so that annular thrusts are located between inner end surfaces of disc cutters. Inner end surfaces of disc cutters and annular thrusts are made as tapered toothed wheels, which may cooperate with each other.

EFFECT: improved synchronizing of disc cutter operation and, as a result, increased advancing and drilling speed.

1 dwg