Fracture Failure Analysis of 127mmG105 Drill Pipe

摘要：

　　The failure cause of one Φ127mm G105 drill pipe was investigated through mechanical properties testing,optical morphologies and fracture analysis.The results show that drill pipes failure reason is the martensite white bright layer in its out-surface caused by intense friction in drilling process.Under the effect of torque and tensile loads,lots of cracks initiated in the white bright layer and developed along the vertical.In the end,when its tensile capacity was less than the weight of drilling string,drill pipe fractured along the horizontal.In addition,H2S in the travelling environment promoted cracks initiation and development.

关键词： drill pipe downhole accident friction heat fracture

作者: Fang Po LI Shu Mao ZHANG Yong Gang LIU Xin XU

作者单位: CNPC Tubular Goods Research Institute, Xran 710065, China CNPC Chuanqing Drilling Engineering Company Limited International Ltd, Chengdu 610051, China

会议类型: 国际会议

会议名称: the 2012 International Conference on Frontiers of Mechanical Engineering and Materials Engineering (机械工程与材料工程国际会议())

会议地点: 香港

会议语种:英文

页码: 248-251

在线出版日期: 2012-07-27（万方平台首次上网日期，不代表论文的发表时间）