There are developed processes of controlling stressed-deformed state of long length barrels in their processing, including heat treatment, transverse bending straightening, hole boring and honing, allowing to achieve the straightness level within 0.1 mm (0,0039 inch) on 1.0 m (3 7/25 ft) length after the completive operation of ionic-vacuum nitriding in pulse plasma without further processing. There are elaborated technological processes of hardening by ionic-vacuum nitriding in pulse plasma for high-loaded threaded surfaces of drill pipe and tubing subs,
increasing their operational life (also due to creating new high-torque threaded connections) by 3 … 5 times.
Nitriding
hardening
subsurface sucker rod pump
subs
high-torque threaded connections
