BIT FOR JET-TURBINE DRILLING Russian patent published in 2016 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: invention relates to the field of drilling wells of large diameter, namely, to bore bits for reactive turbo-drilling (RTD) of roller type. Bore bit for RTD comprises a body with inclined trunnions fixed on which there are cutters with peripheral, intermediate and apical rims equipped with milled, cast or hard-alloy toothed cutting structures. All cutter rims have teeth differently directed relative to the cutter axis. Peripheral rim teeth inclination angle is opposite to the inclination angle of teeth of other rims. Torques simultaneously created by simultaneously sliding teeth of peripheral and other rims on each cutter at the moment of its maximum axial sliding caused by rotation of RTD unit, when its rotation axis is located along the direction of RTD unit rotation, are connected by a certain correlation.

EFFECT: technical result consists in increase of sinking and mechanical speed of drilling by RTD method.

1 cl, 4 dwg