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对一起Φ127×9.19mm的S135钢级钻杆的刺漏事故进行调查,通过钻杆刺孔形貌宏观观察,断口微观分析及EDS能谱分析,结合钻杆材料的力学性能、化学成分和组织对失效钻杆刺漏原因进行试验分析。结果表明,该钻杆刺漏属于早期腐蚀疲劳失效,其原因与钻进过程中钻压偏大和钻杆外壁腐蚀有关。根据失效原因,提出了相对应的改进措施和建议。
Through the investigation on the puncture accident of Φ127 × 9.19mm S135 steel grade drill pipe, macroscopic observation of piercing hole morphology, fracture surface micro-analysis and EDS spectrum analysis were carried out. Combining the mechanical properties of drill pipe material, chemical composition and organization The reasons for the failure of drill pipe leakage test analysis. The results show that the drill pipe leakage belongs to the early corrosion fatigue failure, which is related to the fact that the drill bit pressure is large and the outer wall of the drill pipe is corroded during drilling. According to the reason of failure, the corresponding improvement measures and suggestions are put forward.