DRILLING TOOL FOR DIRECTIONAL WELLS DRILLING WITH AUTOMATIC CONTROL Russian patent published in 2020 - IPC E21B7/08 E21B47/02 E21B47/18 

FIELD: directed drilling of wells.

SUBSTANCE: drilling tool for uninterrupted continuous drilling of wells in rock formations with possibility of selection of well shaft route includes tubular housing, driving shaft of drilling bit, which is made with possibility of rotation in housing and on lower end protruding from housing of which there is a rotary drilling bit, a plurality of located in housing of rigid attachment devices with electric drive to create guiding forces, having radially aligned components of forces, for leveling the drilling tool during drilling operations, and a control device for controlling rigid attachment devices. Stiff fixture devices comprise an actuator to which attachment elements are attached, which are located at least along one attachment plane and are distributed along the housing perimeter and are configured to move radially outward and inward, as well as with the possibility of removal of a shield in the housing grooves. Mobility of rigid attachment devices is controlled by temperature by means of actuator containing at least one thermally expanding pressure transfer medium. Pressure transfer medium represents a liquid or gas. Fluid has coefficient of γ volumetric expansion making 5.0–20.0×10^-4K^-1 at 18 °C, and gas has factor of γ isobaric volume expansion, making 3.0–4.0×10^-3K^-1 at 18 °C. Possibility of accurate continuous control of bit movement, as well as increase in the period of operation without maintenance, automatic correction of borehole deviations from specified direction of drilling with simultaneous control of trajectory.

EFFECT: disclosed is drilling tool for directional well drilling with automatic control.

17 cl, 1 dwg