地热水回灌耦合CO2地质封存数值模拟
摘要：摘要溶解封存可有效解决CO2地质封存的泄漏问题,但地下溶解耗时长,地表溶解成本高。提出将地热水回灌和CO2地质封存耦合,采用CO2和水在回灌井一定深度混合的方法,促进CO2溶解、降低溶解成本。建立了CO2-地热水-盐在井筒和地层的多相流模型,对不同CO2注入速率、混合深度、储层渗透率条件下的井口压力和储层运移情况进行模拟。结果表明：（1）注CO2和水质量比例较小时,随CO2注入速率增加,注水和CO2压力分别维持在1.0 MPa和4.3 MPa左右;当CO2和水质量比例大于储层条件下CO2饱和浓度时,注入压力大幅度增加,游离态CO2在储层上方积聚;（2）混合深度在390 ~ 650 m之间时,注水压力保持稳定;随混合深度增加,注CO2压力逐渐增加;（3）随着水平渗透率和垂直渗透率比值逐渐增大,注水和注CO2压力以及储层压力均减小,碳酸水在储层顶部和底部运移距离的差值逐渐增大。该方法可充分利用地热回灌水实现CO2地质封存同时降低溶解功耗。
Abstract:：Dissolution storage can effectively solve the leakage problem of CO2 geological storage, but subsurface dissolving is time-consuming and the cost of surface dissolution is high. A method of coupling geothermal water recharge and CO2 geological storage was proposed. CO2 and water were mixed at a certain depth in the recharge well to promote dissolution and reduce the dissolution cost. The multiphase flow model of CO2-geothermal water-salt in the wellbore and reservoir was established. The wellhead pressure and reservoir migration were simulated under different CO2 injection rates, mixing depths, and reservoir permeability conditions. The results showed that: (1) when the mass ratio of injected CO2 and water is modest, as the CO2 injection rate increases, the injection water and CO2 pressures remain at 1.0 MPa and 4.3 MPa, respectively; when the mass ratio of injected CO2 and water exceeds the CO2 saturation concentration under reservoir conditions, the injection pressure rises dramatically, and free CO2 accumulates above the reservoir; (2) when the mixing depth is between 390 m and 650 m, the water injection pressure remains steady; the injection pressure of CO2 rises as the mixing depth increases; (3) as the ratio of horizontal permeability to vertical permeability gradually increases, the water injection and CO2 injection pressures and the reservoir pressure decrease, and the difference in the migration distance of carbonated water at the top and bottom of the reservoir gradually increases. This method can make full use of geothermal recharge water to realize CO2 geological storage and reduce dissolution power consumption.
中文标题：地热水回灌耦合CO2地质封存数值模拟
英文标题：Numerical Simulation of Geothermal Water Recharge Coupled with CO2 Geological Storage
发表时间：2023-08-12
作者：
罗亚南, 蒋坤卿, 黄思浩, 冯波, 卜宪标
作者简介：
罗亚南（1997-）,女,硕士研究生,主要从事地热开发与二氧化碳地下封存一体化技术研究。卜宪标（1979-）,男,博士,研究员,博士生导师,主要从事地热能开发利用研究。
关键词：地热水回灌,CO2地质封存,井筒混合,数值模拟,
Key words：geothermal water recharge,CO2 geological storage,wellbore mixing,numerical simulation,
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