FIELD: mining.
SUBSTANCE: drilling bit includes an internal cavity interconnected through fluid medium to a drill string, and a variety of calibrating surfaces and cutters, which are arranged on the outer side of the drilling bit. The variety of calibrating surfaces have many holes that allow the fluid medium of the internal cavity of the drill string leave the drilling bit. At least one hole is located approximately at an angle of 90° behind the larger amount of cutters; with that, the variety of holes also includes a hole having another flow cross-section relative from at least one hole for generation of out-of-balance lateral force. The drilling bit is made so that fluid medium is continuously supplied from each hole to create a resultant stabilising effect. Layout of the drill string bottom includes the above drilling bit.
EFFECT: preventing vibrations and other deviations of a drilling bit or layout of the drill string bottom.
8 cl, 5 dwg
