FIELD: mining.
SUBSTANCE: method for creating axial load at drilling bit consists in creation of axial load at drilling bit by power hydraulic cylinder at immovable drill string, rock slacking off by drilling bit, regular supply of drilling tool pulses to bottom-hole in proportion to rock destroying. Power hydraulic cylinder close to the mouth well is additionally equipped with damping element of single action and is mounted in compressed part of the string with location interval from neutral section, where friction forces against bore walls are less than the values of pulses of string elongated part weight unloading at the bottom-hole.
EFFECT: increase of drilling efficiency of long horizontal interval of the bore due to larger increase of axial load at drilling bit by regular control of friction forces direction at horizontal interval of the bore.
2 cl, 5 dwg
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