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采用宏观分析、化学成分分析、力学性分析、金相检验、扫描电镜断口分析及能谱分析等手段对φ127mm×9.19 mm G105的钻杆刺穿原因进行分析。结果表明,钻杆刺穿的实质是早期疲劳失效;钻井操作中钻杆发生了横振,导致钻杆承受的弯曲应力及其交变频次增大,使疲劳寿命大幅降低;钻杆内壁腐蚀严重,腐蚀坑底由于应力集中产生疲劳裂纹,加速了腐蚀疲劳进程。
The causes of drill rod piercing of φ127 mm × 9.19 mm G105 were analyzed by macroscopic analysis, chemical composition analysis, mechanical analysis, metallographic examination, scanning electron microscope fracture analysis and energy spectrum analysis. The results show that the essence of drill pipe piercing is early fatigue failure. The transverse vibration occurs in the drill pipe during drilling operation, which leads to the increase of bending stress and the alternating frequency of the drill pipe, greatly reducing the fatigue life. The inner wall of the drill pipe is seriously corroded , Corrosion pits due to stress concentration fatigue cracks, accelerated corrosion fatigue process.