BOTTOM-HOLE ASSEMBLY OF DRILL STRING FOR CROOKEDNESS INCREASE AND DRILLING OF HORIZONTAL WELLS

摘要

FIELD: equipment for well drilling; applicable in drilling of horizontal wells. SUBSTANCE: the offered assembly consists of the main motor and additional motor. Novelty in the assembly consists in the following. Motor body is connected by means of sub with rotary stator of additional motor. Rotor of the additional motor is connected by means of pipe and spindle shaft with drill pipe string. Hydraulic distributor is located inside sub, rotor and flexible pipe. Distributor consists of two pitons interconnected by rod. Rod lower end has jaw half-coupling and mating half-coupling is located on end face of sub. Upper piston is connected with flexible pipe by means of splined joint. Rod in the upper part has seat for receiving dropping member made in form of cylinder. To pass fluid, sub and flexible pipe have holes. Distributor is held in the upper position by spring. Flexible pipe and sub have packing to avoid crossflows of fluid. EFFECT: higher operate reliability due to exclusion of necessity of rotation of drill string for turning the motor body in sinking the wellbore stabilization section and reduced costs of equipment. 2 cl, 1 dwg