FIELD: drilling of oil and gas wells; may be used in prevention and elimination of emergencies. SUBSTANCE: assembly has screw downhole motor including the working pair - stator and bit shaft, and device for division of mud flow installed above motor and joined with drill pipe string. Divider of mud flow is made in the form of spring-loaded rod with central channel to pass mud, and pistons engageable with body recesses. Annular space is connected with central channel of piston of mud flow divider by means of radial channel made in body wall. EFFECT: intensive flushing of bottom hole at optimal mode of motor operation. 1 dwg
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