Failure Analysis on Fracture of a Tubing Used in an Oilfield
摘 要
某油田直井气井在正常产气56 d(天)后发生油管本体断裂失效。通过宏观检验、化学成分分析、力学性能测试、金相检验、扫描电镜及能谱分析,对该油管的失效原因进行了综合分析。结果表明:该油管的断裂性质属于腐蚀疲劳断裂;外表面脱碳降低了油管的耐腐蚀能力,在服役过程中管材外表面接触水及空气的位置发生氧腐蚀,形成腐蚀坑,腐蚀坑底部产生应力集中成为疲劳裂纹源;在外力作用下疲劳裂纹不断扩展,最终导致了油管的断裂失效。
Abstract
A tubing used in an oilfield for a vertical gas well fractured after 56 days regular gas production. Macroscopic examination, chemical composition analysis, mechanical property testing, metallographic examination, scanning electron microscopy and energy spectrum analysis were used to comprehensively investigate the failure reasons of the oil tube. The results show that:the fracture of the oil tube belonged to the corrosion fatigue fracture; and the decarburization on the outer surface reduced the corrosion resistance of the oil tube; during the service process, the oxygen corrosion occurred on the outer surface where the water and air contacted, and the corrosion pitting formed; the stress concentration generated in the bottom of corrosion pitting, and induced the fatigue crack source; under the action of external force, fatigue cracks propagated constantly, and finally led to the fracture failure of the tubing.
中图分类号 TG172 DOI 10.11973/lhjy-wl201707013
所属栏目 质量控制与失效分析
基金项目
收稿日期 2016/8/9
修改稿日期
网络出版日期
作者单位点击查看
备注朱丽霞(1980-),女,高级工程师,硕士,主要从事油气输送管材的组织与性能研究,zhulx@cnpc.com.cn
引用该论文: ZHU Lixia,LI Jinfeng,QU Tingting,ZHANG Hua,TONG Ke. Failure Analysis on Fracture of a Tubing Used in an Oilfield[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2017, 53(7): 510~514
朱丽霞,李金凤,瞿婷婷,张华,仝珂. 某油田用油管断裂失效分析[J]. 理化检验-物理分册, 2017, 53(7): 510~514
共有人对该论文发表了看法,其中:
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】张凤武,赵学增,王伟杰.油管无损探伤现状及发展前景[J].油气地面工程,2003,22(9):91-91.
【2】汪洁云.国内外油管现状与加快我国油管发展速度的建议[J].钢管,2000,29(2):44-46.
【3】李鹤林,李平全,冯耀荣.石油钻柱失效分析及预防[M].北京:石油工业出版社,1999:84.
【4】李方坡,王勇.表面脱碳对S135钻杆服役性能的影响[J].金属热处理,2015,40(7):164-167.
【5】王广生,石康才,周敬恩,等.金属热处理缺陷分析及案例[M].北京:机械工业出版社,2007:100.
【6】李方坡,刘永刚,路彩虹,等.G105钻杆管体刺穿失效分析[J].金属热处理,2010,35(11):99-102.
【2】汪洁云.国内外油管现状与加快我国油管发展速度的建议[J].钢管,2000,29(2):44-46.
【3】李鹤林,李平全,冯耀荣.石油钻柱失效分析及预防[M].北京:石油工业出版社,1999:84.
【4】李方坡,王勇.表面脱碳对S135钻杆服役性能的影响[J].金属热处理,2015,40(7):164-167.
【5】王广生,石康才,周敬恩,等.金属热处理缺陷分析及案例[M].北京:机械工业出版社,2007:100.
【6】李方坡,刘永刚,路彩虹,等.G105钻杆管体刺穿失效分析[J].金属热处理,2010,35(11):99-102.
相关信息