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An experiment on heat extraction from a deep geothermal well using a downhole coaxial open loop design

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  • Dai, Chuanshan
  • Li, Jiashu
  • Shi, Yu
  • Zeng, Long
  • Lei, Haiyan

Abstract

We report a field heat extraction test from a deep geothermal well using a downhole coaxial open loop design in Tanggu, Tianjin China, which is different from most previous studies in that the well casing is closed to the geothermal reservoir. A downhole pump installed in the inner tube pumped the geothermal fluids to the surface. After releasing heat by flowing through a plate heat exchanger, the geothermal fluid returned to the aquifer completely and naturally by gravity through the annular section between the inner tube and the borehole wall. The proposed design realizes a sustainable and clean way of “no water withdrawn but heat only” in geothermal utilization. The experimental test well was used as a reinjection well for two years, and the maximum measured temperature in the well before the experiment was only 51 °C. The experimental results show that the proposed configuration worked very well in extracting heat from a deep geothermal reservoir. The system’s stable heat output can reach approximately 275 kW after two weeks of continuous heat extraction, which was much larger than the theoretically calculated value for deep borehole heat exchangers by using the heat conduction model.

Suggested Citation

  • Dai, Chuanshan & Li, Jiashu & Shi, Yu & Zeng, Long & Lei, Haiyan, 2019. "An experiment on heat extraction from a deep geothermal well using a downhole coaxial open loop design," Applied Energy, Elsevier, vol. 252(C), pages 1-1.
    • Handle: RePEc:eee:appene:v:252:y:2019:i:c:9
    DOI: 10.1016/j.apenergy.2019.113447
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    References listed on IDEAS

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    11. Luka Boban & Dino Miše & Stjepan Herceg & Vladimir Soldo, 2021. "Application and Design Aspects of Ground Heat Exchangers," Energies, MDPI, vol. 14(8), pages 1-31, April.
    12. Yu, Han & Xu, Tianfu & Yuan, Yilong & Feng, Bo & ShangGuan, Shuantong, 2023. "Enhanced heat extraction performance from deep buried U-shaped well using the high-pressure jet grouting technology," Renewable Energy, Elsevier, vol. 202(C), pages 1377-1386.
    13. Zhang, Yuanyuan & Ye, Cantao & Kong, Yanlong & Gong, Yulie & Zhang, Dongdong & Yao, Yecheng, 2023. "Thermal attenuation and heat supplementary analysis of medium-deep coaxial borehole system-based on a practical project," Energy, Elsevier, vol. 270(C).
    14. Xia, Z.H. & Jia, G.S. & Ma, Z.D. & Wang, J.W. & Zhang, Y.P. & Jin, L.W., 2021. "Analysis of economy, thermal efficiency and environmental impact of geothermal heating system based on life cycle assessments," Applied Energy, Elsevier, vol. 303(C).
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    16. Ma, Yuanyuan & Li, Shibin & Zhang, Ligang & Liu, Songze & Liu, Zhaoyi & Li, Hao & Shi, Erxiu & Zhang, Haijun, 2020. "Numerical simulation study on the heat extraction performance of multi-well injection enhanced geothermal system," Renewable Energy, Elsevier, vol. 151(C), pages 782-795.

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