THREADED CONNECTION OF THE DRILL STRING Russian patent published in 2023 - IPC E21B17/02 F16L15/00 

FIELD: mining.

SUBSTANCE: proposed invention relates to thrust threaded joints of drill pipes with an outer lock diameter of 120–169 mm and a thread taper of 1:9.6, intended mainly for drilling, including horizontal and highly deviated wells. The threaded connection of the drill string is made with external and internal stops and includes pin and box ends with trapezoidal tapered thread. The thread pitch is 8.467 mm, the taper is 1:9.6, the profile angle is 90°. The inner stop of the nipple end has a cylindrical section adjacent to the thread, and a conical section coupled with it with a taper of 1:9.6. The inner diameter of the pin end is 54 to 96 mm, and the outer diameter of the box end is 120 to 169 mm. The average radius of the thrust end of the nipple is 0.76 to 0.85 of the average radius of the thread section in engagement. The average radius of the thrust face of the coupling is 1.20 to 1.26 of the average radius of the thread section in engagement. The distance between the conical surface passing through the thread cavities and the conical surface of the nipple lies in the range from 0.2 to 0.35 mm.

EFFECT: increase in the maximum allowable torque of the threaded connection, balance in bending in combination with a margin for wear along the outer diameter and increased resistance to alternating loads, as well as an increase in the reliability of the threaded connection of drill pipes.

5 cl, 4 dwg