在油田开采过程中,CO2常作为一种伴生气存在于油田中。干CO2(相对湿度小于60%)对碳钢不构成腐蚀,但CO2易溶于水并与水发生反应生成碳酸,降低水的pH值,增加水的腐蚀性。CO2对钢铁的腐蚀比盐酸严重,使油田管线的寿命大大低于设计寿命。因此,重视油田集油管线中CO2腐蚀的严重性,加强CO2水溶液的腐蚀性的监测和预测,采取预防措施,对于保证油田集油管线的安全运营特别重要。 In the field of oilfield mining, CO2 is often found in oilfields as an associated gas. Dry CO2 (relative humidity less than 60%) on carbon steel does not constitute corrosion, but CO2 is soluble in water and reacts with water to produce carbonic acid, reducing the pH of water, increasing water corrosion. CO2 corrosion of steel than hydrochloric acid serious, so that the life of the oil pipeline is much lower than the design life. Therefore, it is particularly important to pay attention to the seriousness of CO2 corrosion in oil gathering pipelines, to strengthen the monitoring and prediction of CO2 corrosivity and to take precautionary measures in order to ensure the safe operation of oil gathering pipelines.