Numerical simulation of heat extraction in single-well enhanced geothermal system based on thermal-hydraulic-chemical coupling model

被引：0
|
作者：
Guo Z. [1 ,2 ]
Bu X. [2 ]
Li H. [2 ]
Gong Y. [2 ]
Wang L. [2 ]
机构：
[1] School of Engineering Science, University of Science and Technology of China, Anhui, Hefei
[2] Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangdong, Guangzhou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 02期
关键词：
geothermal energy; mineral concentration; permeability; porous media; thermal-hydraulic-chemical coupling;
D O I：
10.16085/j.issn.1000-6613.2022-0754
中图分类号：
学科分类号：
摘要：
The minerals dissolution and precipitation in geothermal water has a significant impact on geothermal resource development. Based on the control equation of water-SiO2 reaction rate, a thermal-hydraulic-chemical (THC) coupling numerical model of single-well enhanced geothermal system (SEGS) was established. The accuracy of flow heat transfer model and solute transport model was validated by the analytical solution. The coupling relationships between reservoir temperature, SiO2 concentration, reaction rate and fracture width were simulated and analyzed. Based on the discrete fracture model, the effects of injection mineral concentration and injection flow rate on the heat transfer performance of SEGS were investigated. The results showed that, ① mineral precipitation caused by over-saturated injection and mineral dissolution caused by under-saturated injection occured at a certain distance away from the injection section, the evolution of fracture aperture was distributed as a band at a fracture plane, and the peak value of reaction rate moved to the periphery with time; ② the maximum differences between injection pressures and production temperatures obtained from the coupling model of TH and THC were 2.12MPa and 4.66℃, respectively. Under-saturated injection reduced the injection pressure and accelerated the attenuation of production temperature, while over-saturated injection was the opposite; ③ when the SiO2 concentration increased by 0.005mol/kg, the average injection pressure increased by 0.5MPa and the average recovery temperature increased by 0.4℃. When the injection flow increased from 8kg/s to 12kg/s, for over-saturated injection, the injection pressure increased by 7.2MPa and the production temperature decreased by 8.58℃ after 30 years; for under-saturated injection, the injection pressure increased by 5.14MPa and the production temperature decreased by 10.43℃. © 2023 Chemical Industry Press. All rights reserved.
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页码：711 / 721
页数：10
相关论文
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