J55钢在模拟CO2 注入井环空环境中的关键性腐蚀因素

崔怀云, 刘智勇, 卢琳

Critical Corrosion Factors for J55 Tubing Steel in a Simulated Annulus Environment of CO2 Injection Well

CUI Huaiyun, LIU Zhiyong, LU Lin

表4 J55钢在不同总压下的电化学阻抗谱拟合数据

Table 4 Fitting results of electrochemical impedance spectra of J55 steel with different total pressure

Ptotal / MPa Rs / Ω·cm2 Qdl × 10-4 / Ω-1·cm-2·s-n ndl Rct / Ω·cm2 RL / Ω·cm2 L / H∙cm-2 Cf / F·cm-2 Rpore / Ω·cm2 15 7.86 5.38 0.814 75.18 253.2 155.8 2.298 26.17 12 6.60 7.49 0.796 70.08 301.4 189.4 2.03 13.66 9 7.10 6.23 0.812 56.67 217.9 112.3 1.349 12.77 6 9.08 5.35 0.819 59.40 203.5 118.3 2.705 18.62 4 8.51 6.50 0.784 67.92 254.7 110.1 1.95 23.12