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模拟高温高压CO2腐蚀实验,通过失重法,结合扫描电镜(SEM)、能谱分析(EDS)和X射线衍射(XRD)等分析技术,研究了原油含水率对N80油套管钢和D级抽油杆(25Cr Mn VA)钢的超临界CO2腐蚀形态、腐蚀速率和腐蚀产物膜特征的影响规律。结果表明:在超临界CO2腐蚀环境中,材质对腐蚀速率具有重要影响。平均腐蚀速率转变的临界含水率,N80钢为75%,25Cr Mn VA钢为50%。腐蚀形态由全面腐蚀向局部腐蚀转变的临界含水率为50%,含水率在50%~75%范围内发生点蚀,含水率高于75%,主要发生台地腐蚀。
Simulated high temperature and high pressure CO2 corrosion experiments were carried out to investigate the effect of crude oil moisture content on N80 oil casing steel and D-class pumping by weight loss method, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction Supercritical CO2 corrosion morphology, corrosion rate and corrosion product film characteristics of 25Cr Mn VA steel. The results show that the material has an important influence on the corrosion rate in supercritical CO2 environment. The critical moisture content of the average corrosion rate transition is 75% for N80 steel and 50% for 25CrMn VA steel. The critical moisture content of the corrosion pattern changing from full corrosion to local corrosion is 50%. The pitting corrosion takes place in the range of 50% -75%. The moisture content is higher than 75%.