The corrosion behavior of X65 steel in CO2/oil/water corrosive environment was studied by the methods of orthogonal experiment and weight loss test in a high temperature and high pressure autoclave.The results show that water cut is the major corrosion factor of X65 steel,which can affect the corrosion rate significantly.The grains of corrosion product film were cellular,and their accumulation was uncompacted.The film had loose structure,its protection effect for the matrix was weak.The steel surface was covered by corrosion scales uniformly and exhibited general corrosion morphology with corrosion pits in some local places,the resistance to CO2 corrosion of X65 steel was comparatively poor.Both at low and high water cut,the corrosion products were basically the same,mainly contained FeCO3 and Fe.%设计正交试验,采用失重法在高温高压反应釜中研究X65钢在CO2/油/水多相流环境中的腐蚀行为.结果表明:原油含水率为集输管线钢CO2腐蚀的主控因素,对腐蚀速率的影响显著;X65钢腐蚀产物膜晶粒呈胞状颗粒堆积,堆积不紧密且存在空隙,与基体结合松散,对基体保护作用弱,试样表面呈现均匀腐蚀形态,局部存在点蚀坑,X65钢抗CO2腐蚀性能较差;原油低含水率与高含水率时X65钢表面腐蚀膜的组成基本相同,都主要是FeCO3和Fe.
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