ADAPTIVE CONTROL METHOD OF WELL DRILLING CONDITIONS, AND BIT FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC E21B44/00 E21B10/18 E21B10/28 

FIELD: mining.

SUBSTANCE: adaptive control method of well drilling conditions is based on control of well sinking speed by changing an axial load on a drilling tool, frequency of its rotation and flow rate of flushing fluid separately or in their combination; with that, the above parameters shall be strictly in compliance with geological working face conditions determined with hardness of mine rock as per the specified algorithm. A well drilling bit includes a housing, a shaft with a pilot bit and a central flushing channel, which is attached to the housing; a flushing assembly in the form of radial channels and head pieces. With that, in upper part of the shaft and opposite teeth of rolling cutter located in upper position relative to the teeth contacting the working face, there installed are additional head pieces for flushing of inter-teeth gaps blocked with slurry.

EFFECT: creation of adaptive drilling conditions by strict compliance of working face mine rock destruction conditions, conditions of working face cleaning from destructed rock and geological conditions determined with mine rock hardness.