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

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

SUBSTANCE: drilling bit comprises U-shaped body, axis secured inside the body and provided with disc rolling cutters installed on the axis and thrust collars arranged between inner end surfaces of disc rolling cutters. Inner end surfaces of disc rolling cutters and thrust collars may cooperate with each other. One radial orifice of horizontal axis is of through type and extend in vertical plane. Axis arranged in above orifice may rotate and is rigidly connected with thrust collar. The axis has rolling cutter with rock-cutting members located from well bottom side.

EFFECT: provision of synchronous operation of all drilling bit members and, as the result, increased advancing rate and drilling speed.

3 cl, 1 dwg