FIELD: drilling equipment. SUBSTANCE: invention is related to drilling equipment and may be used to drill inclined or horizontal holes with the aid of screw face motor. Presence of programmer of stoppage drive of joint of screw face motor, joint of deflecting tool of drive and drill bit in layout of bottom part of drill pipe string allows drilling with various radii of curvature as well as stabilization of zenith angle to be conducted. Actuating mechanism that directs flushing fluid directly into hole clearance without letting it to get to screw face motor is inserted to prevent flushing fluid from reaching screw face motor under flushing condition. EFFECT: enhanced operational reliability of drill pipe string. 9 dwg
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