某油井G105钻杆断裂失效分析  

Failure Analysis of G105 Drill Pipes Fracture in an Oil Well

作　　者：程时遐[1,2] 李德君 师伟 杨琦 赵元雷 曹锋 尹成先 冯耀荣 CHENG Shixia;LI Dejun;SHI Wei;YANG Qi;ZHAO Yuanlei;CAO Feng;YIN Chengxian;FENG Yaorong(Xi'an Jiaotong University,State Key Laboratory of Mechanical Behavior for Materials,Xi'an 710049,China;CNPC Tubular Goods Research Institute Co.,Ltd.,Xi'an 710077,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]中国石油集团工程材料研究院有限公司,西安710077

出　　处：《焊管》2024年第7期56-61,共6页Welded Pipe and Tube

基　　金：国家重点研发计划“石油天然气工业非API石油专用管质量基础设施关键技术体系研究”(项目编号2019YFF0217500)。

摘　　要：在某油井深400~500 m处,钻杆1在解卡时断裂,随后钻杆2在打捞落鱼时断裂。采用断口形貌分析、化学成分分析、显微组织分析、力学性能测试等手段分析了两根钻杆断裂的原因。结果表明,钻杆1与井壁摩擦过程中发生相变,强度下降塑性增加,发生韧性断裂;钻杆2与井壁摩擦时,形成大量马氏体,韧性恶化,当再次承受拉力时发生脆性断裂。建议监测井内结构变化,保证钻井液的循环畅通,优化钻具结构设计,防止钻杆因相变而断裂,同时禁止工人违规操作,避免钻杆因超载发生断裂。At a depth of 400 to 500 meters in an oil well,drill pipe 1 fractures during the stick⁃freeing process,followed by the fracture of drill pipe 2 during the fishing process.The reasons for the fracture of the two drill pipes are analyzed using fracture morphology analysis,chemical composition analysis,microstructure analysis and mechanical properties testing.The results show that during the friction between drill pipe 1 and the wellbore,phase transformation occurs,the strength decrease while the plasticity increase,and ductile fracture occurred.When drill pipe 2 rubs against the wellbore,phase transformation occurs,a large amount of martensite is formed,and the toughness deteriorates.The brittle fracture occurs when the drill pipe 2 is pulled again.It is recommended to detect structural changes in the well,ensure smooth circulation of drilling fluid,and optimize the structural design of drilling tools to prevent the drill pipe from breaking due to phase transformation.Meanwhile,workers are prohibited from violating the regulations to avoid the fracture of drill pipes due to overloading.

关 键 词：钻杆 解卡 相变 韧性断裂 脆性断裂 

分 类 号：TG115[金属学及工艺—物理冶金]