METHOD AND SYSTEM FOR CONTROL OF TORQUE TRANSMISSION FROM THE ROTATING EQUIPMENT Russian patent published in 2016 - IPC E21B4/18 

FIELD: mining.

SUBSTANCE: group of inventions relates to drilling and completion. A system for drilling a borehole in a formation comprising a drill string with the bottom hole assembly (BHA), optionally containing non-rotating portion and the drill bit, and the pipe casing inserted into the wellbore. A drill bit is arranged to penetrate into the formation and making of the wellbore therein. At a first depth along the length of wellbore casing is formed a first set of projections comprising at least one protrusion adapted to control the rotation of optional non-rotating parts. Thus at least one bar is formed on the optional non-rotating portion by which extends along at least a part of the optional non-rotating portion and comes into contact with the first set of projections.

EFFECT: it is possible to reduce or prevent transmission of undesirable torque to the BHA part, as well as to the rest of the drill string.

18 cl, 20 dwg