DRILLING BIT Russian patent published in 2013 - IPC E21B10/18 

FIELD: mining.

SUBSTANCE: drilling bit includes a hollow housing with trunnion, rolling cutter fixed on trunnion and having tangential, central and peripheral channels and annular bore. Tangential channels of rolling cutter are interconnected with tangential channels of trunnion and peripheral channels of rolling cutter. Central channels of rolling cutter are made at an angle to longitudinal axis of rolling cutter and directed to intersection zone of well axes and trunnion; at that, trunnion is equipped with a screen with axial channels periodically interconnected during the bit operation with central channels of the rolling cutter. As a version, screen of trunnion is removable, and its axial channels have different dimensions. As a version, rolling cutter is composite; at that, parting surface is formed with cylinder, the radius of which is larger than outer diameter of the screen.

EFFECT: more effective destruction of rock in central zone of the well; improved performance indicators of the bit operation.

3 cl, 2 dwg