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Failure analysis on the oxygen corrosion of the perforated screens used in a gas injection huff and puff well
Engineering Failure Analysis ( IF 4.4 ) Pub Date : 2020-10-12 , DOI: 10.1016/j.engfailanal.2020.104984 Lei Fan , Yuan Gao , Juntao Yuan , Chenxian Yin , Anqing Fu , Mifeng Zhao , Yan Li , Tao Suo , Xiaoyi Du , Yanhai Wang
更新日期：2020-10-30
Engineering Failure Analysis ( IF 4.4 ) Pub Date : 2020-10-12 , DOI: 10.1016/j.engfailanal.2020.104984 Lei Fan , Yuan Gao , Juntao Yuan , Chenxian Yin , Anqing Fu , Mifeng Zhao , Yan Li , Tao Suo , Xiaoyi Du , Yanhai Wang
The perforated screens of a gas injection huff and puff well broke down in an oilfield in western China. The physical and chemical properties of the failure-perforated screens met the requirements of relevant technical protocols. The injected gas was nitrogen produced by the membrane nitrogen method, which contains approximately 5% O2. Therefore, a substantial amount of O2 entered the well during the gas injection, and greatly promoteed the cathodic process of the electrochemical corrosion. High salinity formation water, especially with large amounts of Cl-, further accelerated the corrosion. The significant oxygen corrosion under the well finally led to the failure of the perforated screen.
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