SYSTEM FOR DIRECTIONAL DRILLING BY ROTARY METHOD WITH ACTIVE STABILIZER Russian patent published in 2020 - IPC E21B7/08 E21B17/10 

FIELD: soil or rock drilling; mining.

SUBSTANCE: invention relates to directional well drilling. Drilling system comprises a rotating drill string for connection to a drill bit for drilling a well; at least one fixed stabilizer fixed on drill string and having outer surface for contact with well wall; and an active stabilizer. Active stabilizer comprises a housing having an external surface for contact with the well wall, an inner surface facing the drill string, and at least one guide part protruding from the inner surface to the drill string, a plurality of actuators connecting the housing and the drill string. Each guide part forms at least one groove. Multiple actuators are configured to cause deviation of the drill string from the centre of the borehole with displacement. Drilling string comprises at least one sliding part, each of which is configured to slide inside one of at least one groove formed in housing of active stabilizer, to limit relative movement between drill string and an active stabilizer along the axial direction of the drill string and control the relative movement between the drill string and the active stabilizer along the radial direction substantially perpendicular to the axial direction of the drill string.

EFFECT: high accuracy of drilling direction control.

11 cl, 6 dwg