CO_2在水湿环境下容易引起钢铁严重腐蚀,低碳钢的CO_2腐蚀速率可高达7 mm/a,在厌氧条件下可达20 mm/a.油田开发过程中,随着油井含水量日益增高,注CO_2驱采油技术的推广应用,以及高含CO_2油藏的开发,CO_2腐蚀问题越来越突出。CO_2腐蚀使油套管过早失效,服役寿命大大低于设计寿命,造成 CO_2 can easily lead to serious corrosion of steel under wet conditions, CO 2 corrosion rate of low carbon steel can reach as high as 7 mm / a and up to 20 mm / a under anaerobic conditions.With the development of oilfield, , The popularization and application of CO 2 flooding recovery technology, and the development of high CO_2 reservoir, the CO 2 corrosion problem becomes more and more prominent. CO_2 corrosion premature failure of the oil casing, service life significantly lower than the design life, resulting