摘要
模拟了油田酸化完井全过程和产出工况,结合电化学分析研究了2205双相不锈钢在这两种环境中的腐蚀行为。结果表明:试验钢在含CO_2气体的地层水中发生轻微的均匀腐蚀,在CO_2分压为4.80 MPa、试验温度为220℃下的均匀腐蚀速率仅为0.002 1mm·a^(-1);在酸化完井全过程腐蚀时,试验钢发生明显的铁素体相选择性溶解腐蚀,腐蚀速率最小为0.523 6mm·a-1,远高于其在含CO_2气体地层水中的腐蚀速率;在新配制酸溶液中腐蚀时,试验钢处于活化状态,腐蚀速率较大,在含0.1MPa CO_2气体的地层水中,试验钢阳极区出现钝化现象,腐蚀速率显著降低。
The corrosion behavior of 2205 duplex stainless steel under the simulated conditions of the whole process of simulated acidification well completion and production was studied by the combination of electrochemical analysis. The results show that the test steel exhibited slightly uniform corrosion in the formation water containing CO,. When the CO2 partial pressure was 4.80 MPa and the experimental temperature was 220 ℃, the corrosion rate was only 0.002 1 mm a-1. The test steel had an obvious ferrite phase selective dissolve corrosion during corrosion in the whole process of acidification well completion, with a lowest corrosion rate of 0.523 6 mm a-1, which was much higher than that in the formation water containing CO2. The test steel was activated in the fresh prepared acid solution, and the corrosion rate was relatively high. In the formation water containing 0.1 MPa CO2, the anodic polarization zone of the test steel showed a passivation phenomenon, and thus the corrosion rate was reduced significantly.
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第2期82-87,共6页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51271146)
陕西省自然科学基础研究计划项目(2016JM5064)
关键词
2205双相不锈钢
油井酸化
地层水
均匀腐蚀
选择性溶解腐蚀
2205 duplex stainless steel
oil well acidizing
formation water
uniform corrosion
selective dissolve corrosion
作者简介
赵国仙（1968-），女，山西运城人．教授，博士
