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大牛地气田的气藏类型为无边底水弹性驱动多层叠合岩性气藏,地层温度适中,气体成分以烃类为主,不含H2S,部分气井含CO2,地层水为氯化钙水型。气田从2003年投产以来,随着其开发的进行,早期投产的气井油、套管均出现了不同程度的腐蚀,这将对以后的生产带来很多问题,甚至产生严重的经济损失。本文将对大牛地气田油管和套管腐蚀的因素及目前腐蚀状况进行了分析,为进一步进行防腐提供参考依据。
The gas reservoirs in the Daniudi gas field are multi-layered superimposed lithologic gas reservoirs with no edge water elasticity. The gas stratum is mainly composed of hydrocarbons with no H2S, some gas wells contain CO2, and the formation water is calcium chloride water type. Since the gas field was put into operation in 2003, with the development of the gas field, the gas wells and casing pipes put into operation early have experienced different degrees of corrosion, which will cause many problems for future production and even cause serious economic losses. In this paper, the corrosion factors of tubing and casing in Daniudi gas field are analyzed and the current corrosion status is analyzed, which provides a reference for further anticorrosion.