What are the causes of geological drill pipe fracture?

       geological drill pipeCauses of fracture: in addition to the quality of the drill pipe itself, there is improper operation in the construction is the main reason for the fracture of the drill pipe. Drill pipe in the process of directional drilling and pipe laying one fracture, will have a serious impact on the project, not only economic losses, but also affect the construction period, loss of credibility, the consequences are unimaginable. Therefore, as a construction enterprise, we must learn how to correctly select and usegeological drill pipeAs a drill pipe manufacturer, it is necessary to know the special requirements of trenchless engineering for drill pipes and produce drill pipes with high strength, high elasticity and high reliability.
　　Main Failure Forms and Cause Analysis of Drill Pipe
　　Drill pipes for trenchless guided and directional drilling are often subjected to large tensile and torsional forces as well as bending forces. When the drill pipe passes through the curve section, the drill pipe is forced to bend, the inner side of the arc is subjected to compressive stress, and the outer side of the arc is subjected to tensile stress. When the drill pipe rotates in the curve section, the rod body is subjected to the alternating stress of tension and compression, and the smaller the radius of curvature of the drilling, the greater the alternating stress. Studies have shown that this alternating stress reaches a certain value, it is very easy to make.geological drill pipeFatigue cracks.
　　At the beginning of the drill pipe fatigue crack fatigue crack is very small, the naked eye is difficult to find, but the fatigue crack development speed is very fast, and finally the performance of the sudden brittle fracture. The test proves that,geological drill pipeFatigue fracture under alternating stress is the main cause of fracture failure of trenchless drill pipe. This conclusion is supported by many drill pipe fracture accidents during the construction of pilot holes.