X80管线钢在高矿化度油田采出液中的腐蚀行为

利用高温高压釜动态模拟实验，采用失重法研究了含水率和CO₂分压对X80管线钢在油水混合物中腐蚀速率的影响；利用扫描电镜 (SEM)、能谱 (EDS) 和X射线衍射技术 (XRD) 等技术手段表征腐蚀产物表面形貌、清理腐蚀产物后试样的表观特征和腐蚀产物成分。结果表明：随着含水率的增加，X80钢的腐蚀速率单调增加；X80钢的腐蚀速率随CO₂分压的增加而增加，分压为1.5 MPa时，产物膜最致密；X80钢在油水混合物中的腐蚀产物主要由FeCO₃构成；CO₂分压一定时，总压的改变对X80钢的腐蚀程度影响较小。

Corrosion Behavior of X80 Pipeline Steel in High-salinity Oilfield Fluids

The corrosion tests of X80 steel were carried out in mixtures of oil and oil-field produced water via a high-temperature and high-pressure autoclave, while the effect of water content and CO₂ partial pressure on the corrosion rate of X80 steel was studied by mass loss method. The steel after corrosion test was characterized by means of scanning electron microscopy (SEM), Energy Dispersive Spectrometer (EDS) and X-ray diffractormeter (XRD). The results indicated that the corrosion rate of X80 steel increased with the increasing water content. The corrosion rate of X80 steel increased with increasing CO₂ partial pressure. Among others, the formed corrosion scale was the most compact when the CO₂ partial pressure reached 1.5 MPa. The corrosion products were mainly composed of FeCO₃. The total pressure had little effect on the corrosion of X80 steel when CO₂ partial pressure was kept the same.