BALANCED THREADED DRILL STRING CONNECTION Russian patent published in 2022 - IPC E21B17/00 

FIELD: drill pipes.

SUBSTANCE: invention relates to a threaded connection of drill pipes, made with external and internal stops, including nipple and box ends with trapezoidal tapered thread, the pitch of which is 8.467 mm, the taper is 1:9.6, the profile angle is 90 degrees, characterized in that with in order to increase the maximum allowable torque of a threaded connection, provided that it is balanced in bending, the outer diameter is from 123.8 to 127 mm, the inner diameter is from 57.2 to 68.3 mm, the average thread diameter in the main plane is from 96.7 to 97.7 mm, and the inner stop of the nipple end has a cylindrical section adjacent to the thread and a conical section associated with it, the outer diameter of the end part of which is from 83 to 84 mm. An additional advantage of the lock is better maintainability compared to the prototype. For recutting the coupling part of the proposed lock, the loss of length is about 45 mm versus 80 mm for the closest analogue.

EFFECT: increase in the maximum allowable torque of the threaded connection of the lock with an outer diameter from 123.8 to 127 mm, provided that it is balanced in bending and there is a margin for wear along the outer diameter.

1 cl, 3 dwg