It was found that there was obvious localized corrosion on the outer wall of the production well oil tubing of Tahe oilfield during tubing inspection,and the corrosion morphology included round pit-like localized corrosion and groove-like localized corrosion.With the basic performance testing,corrosion product characterization,corrosion product bacterial culture and gene sequencing on oil tubing,the cause of corrosion on the outer wall of the oil tubing was clarified as bacterial corrosion and autocatalytic acidification caused by occlusion cells.It is recommended to shorten the placement period of the annular protective fluid for field use and to test the bacterial and oxygen content of the annular protective fluid periodically.
关键词
生产井/油管/细菌腐蚀/失效分析
Key words
production well/oil tubing/bacterial corrosion/failure analysis
维普
万方数据