摘要
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 reasons for the piercement of drill pipe with grade of G 105 and size of Ф127mm×9.19mm G105 were analyzed by morphology analysis, chemical components analysis, mechanical property test, microstructure ecamination, SEM analysis and energy spectrum analysis. The results show that the essence of drill pipe piercement is early fatigue failure. The main reason is that the increase of curvature stress and the alternating frequency induced by lateral vibration can decrease the fatigue life of drill pipe. Moreover, the inside surface of drill pipe can be seriously corroded and the fatigue crack generates at the bottom of corrosion pit, because the stress concentration can accelerate the development of corrosion fatigue.
出处
《热加工工艺》
CSCD
北大核心
2013年第8期229-233,共5页
Hot Working Technology
关键词
钻杆
腐蚀疲劳
横振
底部钻具组合
刚性比
drill pipe
corrosion fatigue
lateral vibration
bottom hole assembly
stillness ratio
