The Influence of Different Mining Modes on the Heat Extraction Performance of Hydrothermal Geothermal Energy

Jingchen Ma, Zhe Liu, Zhi Wang, Shuai Guo, Xian Liu and Yibin Huang ()
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Jingchen Ma: Beijing Institute of Engineering Geology, Beijing 100048, China
Zhe Liu: Beijing Institute of Engineering Geology, Beijing 100048, China
Zhi Wang: Beijing Institute of Engineering Geology, Beijing 100048, China
Shuai Guo: Beijing Institute of Engineering Geology, Beijing 100048, China
Xian Liu: Beijing Institute of Engineering Geology, Beijing 100048, China
Yibin Huang: School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China

Energies, 2024, vol. 17, issue 8, 1-16

Abstract: Hydrothermal geothermal energy, as a widely distributed, large reserve and easily exploitable renewable source, can be used for both power generation and building heating. In this study, a numerical simulation of heat extraction performance is conducted based on monitoring well temperature data in a geothermal field in Xiong’an New Area. The effects of the reinjection temperature, injection flow rate, and reinjection rate on the outlet temperature and the reservoir temperature during a long-term operation are analyzed. The results indicate that the lower reinjection temperature can generate a critical disturbance scope for the thermal reservoir during the exploitation process. The impact scope on the thermal reservoir can reach 210.3 m at a reinjection temperature of 25 °C, which is not conducive to maintaining the outlet temperature of production wells in the long-term. The reinjection rate significantly affects both the horizontal and vertical temperature fields of the thermal reservoir. Under reinjection conditions of 30 °C and 40 kg/s, the horizontal and vertical impact scope of the thermal reservoir are 262.3 and 588.5 m, respectively. The reinjection rate is inversely related to the outlet temperature. A decrease from 100% to 70% in the reinjection rate can increase the outlet temperature by 4.21%. However, a decrease in the reinjection rate will lead to a decline in the groundwater level. Therefore, balancing the variation in outlet temperature and groundwater level is crucial in practical engineering.

Keywords: geothermal energy; numerical simulation; geothermal well group; reinjection rate; groundwater (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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