DRILLING SYSTEM WITH CONTROLLED ACTUATION OF DIRECTION CONTROL PLATFORM Russian patent published in 2019 - IPC E21B7/06 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to field of controlled directional drilling of wells. Well bore formation device in underground formation comprises bottom hole assembly (BHA) comprising a first section and a second section, a flexible member connecting the first BHA section to the second BHA section, configured to be bent to allow axial misalignment between the first BHA and the second section of the BHA, the drill bit attached to the first end of the first section of the BHA, drilling engine arranged along second BHA section and connected to drill bit with possibility of its rotation, besides, said flexible element separates drilling motor from first BHA section, to first end of which bore bit is connected, and a direction control unit located along the BHA, comprising a first direction control unit comprising at least one area generating a force in a first direction, and a second direction control unit spaced axially from the first direction control unit and comprising at least one pad generating force in a second direction different from the first direction, wherein the first and second direction control units are configured to interact to provide an axial mismatch between the first BHA section and the second section of BHA on the flexible member.

EFFECT: achieving high rate of curvature set at low radius of curvature set.

18 cl, 9 dwg