φ127mm×9.19mm G105钻杆管体刺穿原因分析  

Failure Analysis on Piercement of φ127 mm×9.19 mm G105 Drill Pipe

作　　者：颜昌茂 张国正[2] 张春婉[2] 

机构地区：[1]长城钻探工程公司钻具公司,辽宁盘锦124013 [2]西安摩尔石油工程实验室有限公司.陕西西安710065

出　　处：《热加工工艺》2013年第8期229-233,共5页Hot Working Technology

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.

关 键 词：钻杆 腐蚀疲劳 横振 底部钻具组合 刚性比 

分 类 号：TE921.2[石油与天然气工程—石油机械设备]