FIELD: borehole drilling. SUBSTANCE: in process of drilling forward forces and torque are created. Rotational speed is set not less than 150 rpm. Centering mounts are placed at distances from each other at which drilling column does not come in touch with walls of borehole shaft. In this case there should be taken into account value of force of feed of drilling column, rotational speed, specific mass, diameter and flexural rigidity of it as well as diameters of drill bit and Centering mounts. EFFECT: increased drilling efficiency. 1 dwg
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