When drill shank is revoluting,the drill rod will wear with the rock,specially the surface of the screw chaser pontes will wear severely,which affect the fatigue life.
钎杆的旋转凿岩过程会与岩石产生摩擦磨损、特别是螺纹连接部分表层会产较大的磨损,对钎杆疲劳寿命产生重要影响。 认为在这种服役条件下的疲劳寿命是多载荷共同控制的疲劳寿命。
参考来源 - 新型贝氏体钢在磨损载荷作用下协同疲劳寿命的初步研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Secondly there is error between the thread roll angles of thread rolling die and drill rod.
滚丝轮螺纹和钻杆螺纹的螺旋角有误差。
The pressure of the under well drill rod which even works in the caustic medium is extremely complex.
钻柱在井下的受力极度复杂，甚至工作在腐蚀性介质中。
Ever since 1998, corrosion of drill rod and minor corrosion leakage have occurred in Pinghu oil Field in East China Sea.
从1998年开始，东海平湖油气田在钻井中接连出现了钻杆腐蚀与刺漏现象。
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