When the control valve at the end of center pipe was widely open, the pipe failure was mainly caused by high-temperature oxidation.
当中心管末端调节阀开大时，中心管损坏原因主要为高温氧化；
Through the deep investigation and analysis of the drilling pipe failure, the main factors causing drilling pipe failure are found out.
通过对钻杆失效问题的深入调查和分析，找出引起钻杆失效的主要原因。
The drill pipe failure assessment demonstrates the longitudinal brittle fracture will be avoided when the transverse impact power of the material is over 80J.
应用钻杆失效评估技术研究表明，横向材料冲击功大于80J将避免钻杆内螺纹接头纵向脆性开裂失效。
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