Combination of double and single cyclic pressure alternation technique to increase CO2 sequestration with heat mining in enhanced geothermal reservoirs by thermo‐hydro‐mechanical coupling method,International Journal of Energy Research

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Combination of double and single cyclic pressure alternation technique to increase CO2 sequestration with heat mining in enhanced geothermal reservoirs by thermo‐hydro‐mechanical coupling method
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-02-03 , DOI: 10.1002/er.5035
Zhixue Sun ₁ , Kelvin Bongole ₁ , Jun Yao ₁ , Yueying Wang ₁ , James Mboje ₁ , Kadria Seushi ₁ , Chuanyin Jiang ₁ , Tong Wang ₁

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The rise in global temperature due to an unceasingly increase in non‐condensable gases (NCG) prompts more development of safe and economical CCUS (Carbon Capture Utilization and Storage) technologies. Carbon dioxide (CO₂) sequestration with heat mining in deep enhanced geothermal systems (EGSs) is one of the promising methods to reduce CO₂ emitted to the atmosphere. In this study, a cyclic alternation of pressures at the injection and production wells is applied in an EGS for heat mining together with CO₂ deposit. Simultaneous alternation of the injection and production pressures can significantly increase the amount of CO₂ sequestrated compared to applying a fixed pumping or withdrawing pressures at the injector and producer respectively. At the injection well, alternation in pumping pressures at high frequency (small interval of days) increased CO₂ sequestration rate. Reducing the pumping frequency resulted in the lowering of the total amount of CO₂ sequestrated, lesser than using a fixed pumping pressure. The alternation in pumping frequency has a direct relationship to the CO₂ sequestration rate. The frequency of the injection and production pressures refers to the interval in days of the interchange in pressure between high to a low value and vice‐versa. Furthermore, simultaneous alternation of pressures at the injection and production wells respectively (double cyclic method) improved geothermal heat extraction efficiency, thus higher performance for both geothermal and CO₂ sequestration projects.

中文翻译：

热-水力-机械耦合方法结合双循环和单循环压力交替技术增加CO2的固存和热采

由于不可冷凝气体（NCG）不断增加导致的全球温度上升，促使安全性和经济性CCUS（碳捕集利用与存储）技术得到了更多的发展。在深层增强地热系统（EGSs）中通过热采矿将二氧化碳（CO ₂）封存是减少排放到大气中的CO ₂的有前途的方法之一。在这项研究中，将注入井和生产井中压力的周期性变化应用于EGS中，与CO ₂沉积物一起进行热采。注入压力和生产压力的同时交替可以显着增加CO ₂的量与分别在注入器和生产商处施加固定的抽气或抽气压力相比，该产品具有隔离性。在注入井处，高频率（小间隔）的抽水压力交替增加了CO ₂封存率。与使用固定的泵送压力相比，降低泵送频率可以减少固存的CO ₂总量。抽气频率的变化与CO ₂有直接关系固存率。注入压力和生产压力的频率是指压力从高到低到反之亦然的天数间隔。此外，分别在注入井和生产井处同时改变压力（双循环法）提高了地热排热效率，因此对于地热和CO ₂固存项目均具有更高的性能。

更新日期：2020-02-03

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