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6 J55钢在不同pH下的阻抗谱拟合数据

Table 6 The fitting results of electrochemical impedance spectra of J55 steel with different pH value

pH Rs / Ω·cm2 Qdl × 10-4 / Ω-1·cm-2·s-n ndl Rct / Ω·cm2 RL / Ω·cm2 L / H·cm2 Cf / F·cm2 Rpore / Ω·cm2 4 7.10 6.23 0.812 56.67 217.9 112.3 1.349 12.77 5 7.30 6.55 0.804 62.8 215 103 2.32 25.3 6 7.65 4.94 0.807 81.5 253 164 3.06 32