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Cl−对CO2饱和页岩气压裂液中N80钢和TP125 V钢腐蚀行为研究

Effect of Cl− content on the corrosion behavior of N80 and TP125V steel in CO2-saturated shale gas fracturing fluid

    摘要
  • 摘要:
    目的 针对页岩气井下复杂的腐蚀环境，在饱和CO2条件下模拟页岩气压裂液环境，探究不同Cl−含量对N80钢和TP125V钢的腐蚀的影响。
    方法 采用失重法、表面分析法及电化学法等分析质量浓度为5 000~30 000 mg/L的Cl−对N80钢和TP125V钢腐蚀的影响规律。
    结果 随着Cl−质量浓度由5 000 mg/L增加到30 000 mg/L，N80钢的腐蚀速率由0.019 mm/a增至0.025 mm/a，TP125V钢的腐蚀速率由0.021 mm/a增至0.030 mm/a。从试片表面形貌分析，Cl−质量浓度越大，试样表面腐蚀坑数量增多，坑径越大。电化学法测试表明，随着Cl−质量浓度的增加，N80钢的极化电阻Rp逐渐减少，而腐蚀电流Icorr逐渐增加，也进一步说明腐蚀程度更加严重。
    结论 在CO2饱和页岩气压裂液环境中，Cl−含量的增加会促进N80钢和TP125V钢的腐蚀。

     

    Abstract:
    Objective In response to the complex corrosion environment in the shale gas field, the effect of Cl− content on the corrosion behavior of N80 steel and TP125V steel were explored under the condition of simulating CO2-saturated shale gas fracturing fluid environment.
    Method The influence of 5 000-30 000 mg/L Cl− mass concentration on the corrosion of N80 steel and TP125V steel was analyzed with weight loss method, surface analysis and electrochemical method.
    Result  With the increase of Cl− mass concentration from 5 000 mg/L to 30 000 mg/L, the corrosion rate of N80 steel increased from 0.019 mm/a to 0.025 mm/a, and the corrosion rate of TP125V steel increased from 0.021 mm/a to 0.030 mm/a. The higher the Cl− mass concentration was, the more corrosion pits on the surface of the specimens increased, and the larger diameter of the pits became according to the surface morphology analysis of the specimens. Electrochemical testing indicated that as Cl− mass concentration gradually increased, the polarization resistance (Rp) of N80 steel gradually decreased, while the corrosion current (Icorr) gradually increased, further indicating that corrosion is more severe.
    Conclusion The increase of Cl− content can promote the corrosion of N80 and TP125V steel in a CO2-saturated shale gas fracturing fluid environment.

     

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