摘要
在含CO_2油气储层的开发过程中,井下工具的CO_2腐蚀严重威胁油田安全生产。利用高温高压釜模拟油田高CO_2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,80~130℃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。
During the development process of hydrocarbon reservoir containing C02, 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 32CrMo 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.
出处
《石油化工腐蚀与防护》
CAS
2017年第6期1-4,共4页
Corrosion & Protection In Petrochemical Industry
关键词
CO2腐蚀
温度
腐蚀速率
腐蚀产物
腐蚀形貌
CO2 corrosion, temperature, corrosion rate, corrosion product, corrosion morphology
