采用高温高压釜模拟CO₂驱油工况，通过失重法测得J55管材钢在CO₂驱油注采环境中的腐蚀速率，采用扫描电镜（SEM）、X射线衍射仪（XRD）、EDS能谱对腐蚀产物的形貌与成分进行分析，考察了CO₂分压和矿化度对J55管材的腐蚀影响。结果表明：模拟CO₂驱工况下，J55钢在CO₂分压为0~25 MPa时，气、液相的腐蚀速率均超过0.076 mm/a的标准要求，CO₂分压为10 MPa时，其腐蚀速率高达7.047 mm/a，腐蚀产物由FeCO₃和FeS组成；Cl^-浓度增加会使溶液矿化度增大，并导致腐蚀介质电导率增大、电荷传输速率加快，从而加剧腐蚀，腐蚀结垢产物呈增加趋势，平均腐蚀程度逐渐减小，但点蚀增加。

The high temperature autoclave was used to simulate the CO₂ flooding condition, and the corrosion rate of J55 tubular steel in the CO₂ flooding oil injection and production environment was measured by the weight loss method. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), and EDS energy spectrum were used to analyze the morphology and composition of corrosion products, and the effects of CO₂ partial pressure and salinity on the corrosion of J55 pipes were investigated. The results showed that under the simulated CO₂ flooding condition, when the CO₂ partial pressure of J55 steel was 0-25 MPa, the corrosion rates of the gas and liquid phases both exceed the standard requirement of 0.076 mm/a. When the partial pressure of CO₂ was 10 MPa, the corrosion rate was high as 7.047 mm/a, and the corrosion products were composed of FeCO₃ and FeS. The increase of Cl^- concentration would increase the salinity of the solution, and led to the increase of the conductivity of the corrosion medium and the acceleration of the charge transfer rate, thereby intensifying the corrosion, the corrosion and scaling products showed an increasing trend, the average corrosion degree gradually decreased, but the pitting increased.