ARRANGEMENT OF DOWNHOLE MOTOR FOR DIRECTIONAL DRILLING OF HOLES Russian patent published in 2003 - IPC

FIELD: drilling equipment, drilling of holes in mix of screw downhole motors. SUBSTANCE: arrangement has upper bent sub with resting butt and crooked nipple interacting with the aid of conical threaded connection in which nominal value of axial interference is greater than half-pitch of this thread. It also includes stop nut put on additional thread in crooked nipple for interaction between face of stop nut and resting butt of upper bent sub and with another face with resting protrusion made in crooked nipple. Length of stop nut is equal to distance from resting butt of upper bent sub mounted on crooked nipple with maximum interference in conical threaded connection to resting protrusion. EFFECT: reliable fixing of downhole motor to increase precision of driving of inclined and horizontal holes, prolonged service life and raised functional reliability and economic efficiency of arrangement. 2 cl, 1 dwg