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Simulation of heat extraction and injection optimization from a vertical-well closed-loop geothermal system
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Yongfa Ma1, 2, 3, 4, 5, 6, Xuejun Zhou1, 5, 6, Lijuan Yuan2, Ling Liu1, 5, 6, Junling Dong1, 5, 6, Xu Wang1, 5, 6, Tao Zhan1, 6, Lan He1, Xin Liu1, 5, 6, Yan Liu1, 5, 6, Chang Li1, 5, Hongwu Lei7
Renewable Energy Resources | 2024, 42(10) : 1302 - 1311
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Renewable Energy Resources | 2024, 42(10): 1302-1311
Simulation of heat extraction and injection optimization from a vertical-well closed-loop geothermal system
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Yongfa Ma1, 2, 3, 4, 5, 6, Xuejun Zhou1, 5, 6, Lijuan Yuan2, Ling Liu1, 5, 6, Junling Dong1, 5, 6, Xu Wang1, 5, 6, Tao Zhan1, 6, Lan He1, Xin Liu1, 5, 6, Yan Liu1, 5, 6, Chang Li1, 5, Hongwu Lei7
Affiliations
  • 1 Institute of Ecological Geology Survey and Research of Heilongjiang Province Harbin 150030 China
  • 2 Key Laboratory of Shallow Geothermal Energy, Ministry of Natural Resources of the People's Republic of China Beijing 100195 China
  • 3 Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education Jilin University Changchun 130026 China
  • 4 Key Laboratory of Groundwater Resources and Environment Jilin University Changchun 130021 China
  • 5 Engineering Technology Research Center of Cold Region Geothermal Energy of Heilongjiang Province Harbin 150027 China
  • 6 Innovation Base of Cold Region Geothermal Energy Application Technology of Northeast China, Geological Society of China Harbin 150027 China
  • 7 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics, Chinese Academy of Sciences Wuhan 430071 China
Published: 2024-10-20
Outline
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To evaluate the heat extraction performance and optimize the injection parameters of a singlewell ClosedLoop Geothermal System (CLGS), this paper analyzes the shortterm (thermal response testing) and longterm (one heating season) heating performance of CLGS and optimizes operation parameters including injection temperature and rate, based on wellbore reservoir coupling simulation and site operation monitoring data for a typical site in Northeast China. The results indicate that the mean heat extraction rate is 65.2 kW and the average temperature difference between the output and inlet is 4.9 °C with an average injection temperature of 7 °C and an injection flow rate of 7.7 m³/h for a vertical well of 1 700 m. At the end of a heating season, the maximum range for temperature reduction in the formation is approximately 7 m with the maximum temperature decrease up to 23 °C, and it can recovery better during the nonheating period. Without considering operating costs and sustainable development, the low injection temperature and large injection rate result in high heat extraction rate. Setting the injection temperature to 5 °C and flow rate to 6.3 m³/h can minimize operating costs while meeting heating needs, reducing costs by 20% compared to the existing solution. The optimization design that considers operating costs and sustainable development has practical significance for a single well closedloop geothermal system.

geothermal heating  /  vertical-well closed-loop geothermal system  /  performance evaluation  /  optimization of injection  /  numerical simulation
Yongfa Ma, Xuejun Zhou, Lijuan Yuan, Ling Liu, Junling Dong, Xu Wang, Tao Zhan, Lan He, Xin Liu, Yan Liu, Chang Li, Hongwu Lei. Simulation of heat extraction and injection optimization from a vertical-well closed-loop geothermal system[J]. Renewable Energy Resources, 2024 , 42 (10) : 1302 -1311 .
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Article Info
  • Receive Date：2023-11-27
  • Online Date：2025-07-22
  • Published：2024-10-20
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  • Received：2023-11-27
Funding
Affiliations
    1 Institute of Ecological Geology Survey and Research of Heilongjiang Province Harbin 150030 China
    2 Key Laboratory of Shallow Geothermal Energy, Ministry of Natural Resources of the People's Republic of China Beijing 100195 China
    3 Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education Jilin University Changchun 130026 China
    4 Key Laboratory of Groundwater Resources and Environment Jilin University Changchun 130021 China
    5 Engineering Technology Research Center of Cold Region Geothermal Energy of Heilongjiang Province Harbin 150027 China
    6 Innovation Base of Cold Region Geothermal Energy Application Technology of Northeast China, Geological Society of China Harbin 150027 China
    7 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics, Chinese Academy of Sciences Wuhan 430071 China
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