通过腐蚀失重、SEM、XRD等方法，研究了X65钢在模拟集输管道CO₂/油/水环境中的腐蚀特性。结果表明：X65钢腐蚀速率随流速和CO₂分压升高均呈现先增大后减小的趋势，存在临界流速和临界压力；低于临界值，基体表面上生成的腐蚀产物疏松多孔、不稳定，高于临界值后形成的产物膜致密、附着力较强，具有一定保护作用；流速增大超过1 m/s会使油膜比较均匀地吸附在试样表面，减少了腐蚀反应活性点，一定程度上保护了基体不被腐蚀，腐蚀速率下降；随CO₂分压增大，CO₂在原油内的溶解度增加使原油黏度下降，流动性变好，与基体接触和吸附的概率增加，对X65钢的缓蚀作用增强，也会使腐蚀速率下降。

The corrosion behavior of X65 steel in the CO₂/oil/water environment in gathering pipeline was investigated by mass loss method, SEM and XRD. The results show that the corrosion rate of the X65 steel increased at first and then decreased with the increase of flow rate and CO₂ pressure, and critical velocity and critical pressure existed, below the critical value, the corrosion products formed on the steel surface were loose, porous and unstable, higher than the critical value, the product films were dense and had strong adhesion with a certain protective effect. When the flow rate increased to more than 1 m/s, the oil film adsorbed on the sample surface more evenly, the active points of corrosion reaction were reduced and the substrate was protected from being corroded, thus the corrosion rate decreased. With the increase of CO₂ partial pressure, the solubility of CO₂ in crude oil increased, the viscosity of crude oil decreased, the mobility of the crude oil became better and the probability of oil film adsorption increased, these factors led to the reinforcement of corrosion inhibition to X65 steel, and the corrosion rate decreased.