FIELD: mining.
SUBSTANCE: group of inventions relates to controlled directional drilling. System for directional drilling comprises a rotating drill string for connection with a drill bit for drilling a well along a drilling path, an active stabilizer comprising a housing having an outer surface for contact with the wall of the well, and a plurality of actuators connecting the housing and the drill string, a direction parameter measuring unit for measuring direction parameters during drilling, wherein the direction parameters comprise at least one of the following: declination angle and azimuth angle of the well, a module for measuring parameters of unbalance for measuring parameters of unbalance during drilling, wherein unbalance parameters include at least one of the following: transverse force, bending moment and torque at the measurement point near the drill bit, and a controller for controlling the drilling trajectory based on the measured direction and imbalance parameters. Controller comprises calculator to calculate correction required for displacement, based on measured direction and unbalance parameters and expected values of said parameters. Each actuator comprises at least one hinged joint rotatable about at least two axes to cause deviation of the drill string from the center of the borehole with displacement to change the direction of drilling.
EFFECT: higher accuracy of drilling direction control.
15 cl, 16 dwg
