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采用高温高压动态腐蚀模拟试验与理论分析相结合的方法,研究了油气田常用的油套管材料N80钢、1Cr钢、3Cr钢和13Cr钢在井下高温高压动态(液相介质流速为2.62m/s)环境下的CO2腐蚀。结果表明,在温度为100℃和110℃、CO2压力为0.03MPa和1.488MPa的井下腐蚀环境中,油气田生产中常用的油套管材料的腐蚀程度排序为:3Cr>1Cr>N80>13Cr钢;在此条件下的耐腐蚀能力方面,1Cr和3Cr钢没有表现出优势;13Cr钢具有良好的耐CO2腐蚀性能;N80钢和3Cr钢在井下油中的腐蚀轻微。
Using the combination of high temperature and high pressure dynamic corrosion simulation and theoretical analysis, the effects of high temperature and high pressure on N80 steel, 1Cr steel, 3Cr steel and 13Cr steel commonly used in oil and gas fields were studied. The flow rate of liquid medium was 2.62m / s ) CO2 corrosion in the environment. The results show that the corrosive degrees of oil casing materials commonly used in oil and gas field production are as follows: 3Cr> 1Cr> N80> 13Cr steel in downhole corrosion environment with temperature of 100 ℃ and 110 ℃, CO2 pressure of 0.03MPa and 1.488MPa; Under the conditions of corrosion resistance, 1Cr and 3Cr steel did not show the advantage; 13Cr steel has good resistance to CO2 corrosion; N80 steel and 3Cr steel corrosion in the downhole oil minor.