高温高压气井连续管在CO2环境中的电化学腐蚀数值模拟

刘元亮 刘少胡 马卫国

刘元亮, 刘少胡, 马卫国. 高温高压气井连续管在CO2环境中的电化学腐蚀数值模拟[J]. 高压物理学报, 2020, 34(5): 052401. doi: 10.11858/gywlxb.20200535
引用本文: 刘元亮, 刘少胡, 马卫国. 高温高压气井连续管在CO2环境中的电化学腐蚀数值模拟[J]. 高压物理学报, 2020, 34(5): 052401. doi: 10.11858/gywlxb.20200535
LIU Yuanliang, LIU Shaohu, MA Weiguo. Numerical Simulation of CO2 Electrochemical Corrosion of Coiled Tubing in High-Temperature and High-Pressure Gas Wells[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 052401. doi: 10.11858/gywlxb.20200535
Citation: LIU Yuanliang, LIU Shaohu, MA Weiguo. Numerical Simulation of CO2 Electrochemical Corrosion of Coiled Tubing in High-Temperature and High-Pressure Gas Wells[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 052401. doi: 10.11858/gywlxb.20200535

高温高压气井连续管在CO2环境中的电化学腐蚀数值模拟

doi: 10.11858/gywlxb.20200535
基金项目: 国家自然科学基金(51604039,51974036);长江大学长江青年科技创新团队基金(2016CQT01);长江大学青年基金(2015CQN44)
详细信息
    作者简介:

    刘元亮(1996—),男,硕士研究生,主要从事连续管电化学腐蚀、高温高压腐蚀研究.E-mail:463146983@qq.com

  • 中图分类号: TQ035

Numerical Simulation of CO2 Electrochemical Corrosion of Coiled Tubing in High-Temperature and High-Pressure Gas Wells

  • 摘要: 针对高温高压气井中连续管在含CO2地层极易腐蚀、开裂等问题,调研了腐蚀失效情况,分析其腐蚀失效机理。应用COMSOL多物理场耦合分析方法,建立连续管在CO2环境中的电化学腐蚀数值模型,分析环境因素对腐蚀速率的影响规律。结果表明:实验腐蚀速率和数值模拟腐蚀速率的最小误差为1.3%;CO2分压分别为0.1、0.5和1.0 MPa时,连续管腐蚀速率达到峰值时的温度分别为120、90和60 ℃;当CO2分压为0.1 MPa、电解质溶液电导率为2.86、pH值较小时,连续管的腐蚀速率最大。该研究为CO2腐蚀环境下连续管的安全使用提供了建议。

     

  • 图  连续管失效情况统计[18]

    Figure  1.  Statistics of coiled tubing failure[18]

    图  连续管腐蚀后的形貌

    Figure  2.  Corrosion morphology of CT

    图  连续管实物图和数值模拟腐蚀过程的简化模型

    Figure  3.  Picture of actrual CT and simplified numerical simulation model of CT corrosion

    图  电解质溶液中电位分布和电流流向模拟结果

    Figure  4.  Potential distributions and current directions of electrolyte solution at two temperatures

    图  电解质溶液中电流密度流线模拟结果

    Figure  5.  Current density diagrams of electrolyte solution at two temperatures

    图  溶液pH值对管材腐蚀速率的影响

    Figure  6.  Influence of pH value on corrosion rate of CT

    图  温度和CO2分压对连续管腐蚀速率的影响

    Figure  7.  Influence of temperature and partial pressure of CO2 on corrosion rate of CT

    图  不同CO2分压下连续管的腐蚀速率

    Figure  8.  Corrosion rates of CT under different CO2 partial pressures

    图  pH值对连续管腐蚀速率的影响

    Figure  9.  Corrosion rates of CT at different pH values

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出版历程
  • 收稿日期:  2020-04-03
  • 修回日期:  2020-04-13
  • 发布日期:  2020-07-25

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