安全、健康和环境2024，Vol.24Issue(5)：41-46,6.DOI:10.3969/j.issn.1672-7932.2024.05.009
某油井P110油管接箍断裂失效分析
Failure Analysis of P110 Tubing Coupling Fracture in an Oil Well
摘要
Abstract
In order to find out the reason of the frac-ture and guide the safe production in the later stage of oil recovery,the causes of the short term fracture of the tubing coupling were studied by means of macro-scopic morphology,chemical composition,physical and chemical properties,energy spectrum and scan-ning electron microscope analysis.The results showed that the fracture of the pipe coupling was affected by non-metallic inclusions,and the impact performance was poor,which did not meet the requirements of the standard specification.There was flow-field induced corrosion at the threaded coupling,which was the re-sult of H2S and CO2.Local corrosion pits were formed at the root of the thread tooth,forming a fatigue source,fatigue cracks extended to a certain extent,brittle fractures were produced in the acidic corrosion environment,and a small number of secondary cracks were found in the section.It was concluded that the fracture failure of the pipe was mainly caused by cor-rosion and fatigue fracture caused by non-metallic in-clusions,H2S and CO2,and the sulfide stress corro-sion cracking had an effect on the fracture of the pipe.It was recommended to use sulfur-resistant tubing for Wells with high H2S content,reduce the content of in-clusions,improve the heat treatment process of materi-als,and select materials with strong stress corrosion cracking resistance.关键词
腐蚀/疲劳/节箍断裂/P110油管/失效分析Key words
corrosion/fatigue/hoop fracture/P110 tubing/failure analysis分类
能源科技引用本文复制引用
付小坤,田磊,郭福贵,杨兴..某油井P110油管接箍断裂失效分析[J].安全、健康和环境,2024,24(5):41-46,6.基金项目
国家科技重大专项(2016ZX05053),塔里木盆地碳酸盐岩油气田提高采收率关键技术示范工程. （2016ZX05053）
