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A novel single-well geothermal system for hot dry rock geothermal energy exploitation

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  • Huang, Wenbo
  • Cao, Wenjiong
  • Jiang, Fangming

Abstract

Existing hot dry rock geothermal projects are commonly confronted with some technical issues, such as corrosion and scaling, and water loss. To resolve these issues, the present work proposes a novel system for mining hot dry rock geothermal energy, in which a reservoir is combined with a heat pipe system. The new system encompasses a heat pipe placed in a single-well to extract hot dry rock geothermal energy, while an artificial reservoir is built around the main endothermic region of the well, which is permeable and saturated with carbon dioxide (CO2). This wellbore structure design may stimulate a stronger natural convection in the reservoir, resulting in a higher thermal power production. To evaluate the proposed system, an extensive numerical investigation was conducted. The comparison of the proposed system with the conventional downhole heat exchanger (DHE) system in terms of heat extraction performance indicates clear superiority of the proposed system primarily due to the associated thermosyphon effect of CO2 fluid in the reservoir. To better understand how operating and design variables affect the heat extraction performance of the system, a detailed sensitivity analysis was conducted taking into consideration a wide range of possible configurations and working conditions. The eventually obtained knowledge will guide the design of the system in practice.

Suggested Citation

  • Huang, Wenbo & Cao, Wenjiong & Jiang, Fangming, 2018. "A novel single-well geothermal system for hot dry rock geothermal energy exploitation," Energy, Elsevier, vol. 162(C), pages 630-644.
    • Handle: RePEc:eee:energy:v:162:y:2018:i:c:p:630-644
    DOI: 10.1016/j.energy.2018.08.055
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    References listed on IDEAS

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    Cited by:

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    3. Cheng, Sharon W.Y. & Kurnia, Jundika C. & Ghoreishi-Madiseh, Seyed Ali & Sasmito, Agus P., 2019. "Optimization of geothermal energy extraction from abandoned oil well with a novel well bottom curvature design utilizing Taguchi method," Energy, Elsevier, vol. 188(C).
    4. Li, Zhibin & Huang, Wenbo & Chen, Juanwen & Cen, Jiwen & Cao, Wenjiong & Li, Feng & Jiang, Fangming, 2023. "An enhanced super-long gravity heat pipe geothermal system: Conceptual design and numerical study," Energy, Elsevier, vol. 267(C).
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    7. Xie, Jingxuan & Wang, Jiansheng, 2022. "Compatibility investigation and techno-economic performance optimization of whole geothermal power generation system," Applied Energy, Elsevier, vol. 328(C).
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    9. Chen, Juanwen & Huang, Wenbo & Cen, Jiwen & Cao, Wenjiong & Li, Zhibin & Li, Feng & Jiang, Fangming, 2022. "Heat extraction from hot dry rock by super-long gravity heat pipe: Selection of working fluid," Energy, Elsevier, vol. 255(C).
    10. Xiangchao Shi & Leiyu Gao & Jie Wu & Cheng Zhu & Shuai Chen & Xiao Zhuo, 2020. "Effects of Cyclic Heating and Water Cooling on the Physical Characteristics of Granite," Energies, MDPI, vol. 13(9), pages 1-18, April.
    11. Theo Renaud & Lehua Pan & Hannah Doran & Gioia Falcone & Patrick G. Verdin, 2021. "Numerical Analysis of Enhanced Conductive Deep Borehole Heat Exchangers," Sustainability, MDPI, vol. 13(12), pages 1-21, June.
    12. Huang, Wenbo & Chen, Juanwen & Cen, Jiwen & Cao, Wenjiong & Li, Zhibin & Li, Feng & Jiang, Fangming, 2022. "Heat extraction from hot dry rock by super-long gravity heat pipe: Effect of key parameters," Energy, Elsevier, vol. 248(C).
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    14. Chen, Yun & Ma, Guowei & Wang, Huidong & Li, Tuo & Wang, Yang & Sun, Zizheng, 2020. "Optimizing heat mining strategies in a fractured geothermal reservoir considering fracture deformation effects," Renewable Energy, Elsevier, vol. 148(C), pages 326-337.
    15. Feng Li & Juanwen Chen & Jiwen Cen & Wenbo Huang & Zhibin Li & Qingshan Ma & Fangming Jiang, 2023. "Two-Phase Flow Visualization and Heat Transfer Characteristics Analysis in Ultra-Long Gravity Heat Pipe," Energies, MDPI, vol. 16(12), pages 1-16, June.
    16. Hu, Xincheng & Banks, Jonathan & Guo, Yunting & Liu, Wei Victor, 2021. "Retrofitting abandoned petroleum wells as doublet deep borehole heat exchangers for geothermal energy production—a numerical investigation," Renewable Energy, Elsevier, vol. 176(C), pages 115-134.
    17. 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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