The heavier drill rod should bear the periodic stress of stretching, compression, torsion and bending. Stretching and bending are the most dangerous stresses. At present, the main reason for the fatig...

When the drill string reaches the critical speed, the drill pipe will vibrate. This vibration often causes the bending, excessive wear, rapid damage and fatigue damage of drill pipe. In particular, th...

At present, the laying of pipelines will often use trenchless pipe jacking technology, and trenchless rig is bound to use this technology in the modern society, with the special common trenchless pipe...

Need to use a variety of mining geological drill pipe material in the process of using good materials to ensure that the entire mining work best efficiency. However, in the process of purchasing mater...

When the joint is rocked during severe vibration, cracks occur at the first thread of the external thread. It shows that:(1) the Mn content of the alloy steel material for the drill pipe transformatio...