焊管2024，Vol.47Issue(7)：56-61,6.DOI:10.19291/j.cnki.1001-3938.2024.07.009
某油井G105钻杆断裂失效分析
Failure Analysis of G105 Drill Pipes Fracture in an Oil Well
摘要
Abstract
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Key words
drill pipe/stick-freeing/phase transformation/ductile fracture/brittle fracture分类
矿业与冶金引用本文复制引用
程时遐,李德君,师伟,杨琦,赵元雷,曹锋,尹成先,冯耀荣..某油井G105钻杆断裂失效分析[J].焊管,2024,47(7):56-61,6.基金项目
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). （项目编号2019YFF0217500）
