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7 J55钢在不同温度下电化学阻抗谱的拟合数据

Table 7 Fitting results of electrochemical impedance spectra of J55 steel with different temperature

T / oC 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 5 12.4 3.67 0.83 242.8 1098 1952 - - 15 13.22 4.97 0.813 116.8 562 689 - - 25 7.10 6.23 0.812 56.67 217.9 112.3 1.349 12.77 40 7.27 13.2 0.772 26.84 74.5 19.8 3.299 2.43 50 5.62 12.5 0.813 18.3 53.7 12.7 3.11 7.64