FIELD: well drilling. SUBSTANCE: deflecting tool is controlled during drilling by means of downhole gravitation sensitive element attached to deflecting tool interacting with earth gravitation field. Gravitation sensor acts on downhole electrohydraulic valve in process of circulation scanning by turning the drill string with servo drive with its smooth feed. In so doing, variation of mud pressure at the day surface is measured and drill string torque. Sensor is made in form of spring-loaded inertial mass and rigidly connected one arm of lever. The other end of lever arm is mechanically connected with potentiometer wiper which is connected via amplifier with electromagnetic drive. EFFECT: higher efficiency. 5 dwg
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