【摘要】 在含CO₂油气储层的开发过程中,井下工具的CO₂腐蚀严重威胁油田安全生产。利用高温高压釜模拟油田高CO₂分压和高矿化度的生产环境进行腐蚀试验,在不同温度条件下分析3种钢的腐蚀速率。利用扫描电镜（SEM）和X射线衍射仪（XRD）等手段进行分析,确定其耐蚀性能,为不同钢材井下工具寿命预测提供依据。研究表明:N80和P110钢的腐蚀速率随温度的升高先增加后降低且分别在80℃出现最大值4.1和4.8 mm/a;32Cr Mo钢的腐蚀速率随温度升高呈下降趋势,80¹30℃时腐蚀速率在2.0 mm/a附近波动;3种钢在低温条件下均以全面均匀腐蚀为主,在中温区存在严重的局部腐蚀,越过腐蚀高点后仍以均匀腐蚀为主。更多还原

【Abstract】 During the development process of hydrocarbon reservoir containing CO₂,corrosion of downhole tool caused by CO₂ seriously threatened the production safety. Corrosion rates of three steels were determined under different temperatures in an autoclave which could simulate the oilfield environment of high CO₂ partial pressure and high salinity. Performance of the steels was investigated by SEM and XRD,which could provide a reference for the life prediction of downhole tool. The results showed that corrosion rates of steel N80 and P110 increased and then decreased with the increase of temperature and the maximum values were 4. 1 and 4. 8 mm/a,respectively; corrosion rate of 32 Cr Mo steel decreased with the increase of temperature,and fluctuated basically around 2 mm/a in the range of 80 130 ℃; corrosion morphology of the steels varied with temperature,i. e.,general corrosion mainly appeared under low temperature,severe localized corrosion existed in the middle temperature zone and then uniform corrosion tended to occur after reaching the highest corrosion rates.更多还原