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Equivalent flow channel model for doublets in heterogeneous porous geothermal reservoirs

Author

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  • Zhao, Zhihong
  • Dou, Zihao
  • Liu, Guihong
  • Chen, Sicong
  • Tan, Xianfeng

Abstract

This study presents a general numerical modeling framework for application to doublets in heterogeneous porous geothermal reservoirs. Extension of the equivalent flow channel model for fractured media leads to an inverse model that combines an analytical solution of solute transport equation with differential evolution method for global optimization. When constrained by data from tracer tests, the inverse model can calculate the geometric and transport parameters pertaining to equivalent flow channels that link injection and production wells. A distinct forward model is developed based on an analytical solution for heat transport in equivalent flow channels, where the parameters calculated from the inverse model serve as inputs for predicting thermal breakthrough at production wells. A case study uses the modeling framework in combination with data from tracer tests to calculate the parameters of equivalent flow channels that link two distinct doublets at Dezhou geothermal field, Shandong, China, followed by the prediction of production well thermal breakthrough. The results show that flow channel parameter values are similar for the two doublets. A sensitivity analysis is performed to understand the roles of flow channel dimensions and flow rate in equivalent flow channels in thermal breakthrough curves at production wells.

Suggested Citation

  • Zhao, Zhihong & Dou, Zihao & Liu, Guihong & Chen, Sicong & Tan, Xianfeng, 2021. "Equivalent flow channel model for doublets in heterogeneous porous geothermal reservoirs," Renewable Energy, Elsevier, vol. 172(C), pages 100-111.
    • Handle: RePEc:eee:renene:v:172:y:2021:i:c:p:100-111
    DOI: 10.1016/j.renene.2021.03.024
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    References listed on IDEAS

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    1. Liu, Guihong & Pu, Hai & Zhao, Zhihong & Liu, Yanguang, 2019. "Coupled thermo-hydro-mechanical modeling on well pairs in heterogeneous porous geothermal reservoirs," Energy, Elsevier, vol. 171(C), pages 631-653.
    2. Liu, Guihong & Wang, Guiling & Zhao, Zhihong & Ma, Feng, 2020. "A new well pattern of cluster-layout for deep geothermal reservoirs: Case study from the Dezhou geothermal field, China," Renewable Energy, Elsevier, vol. 155(C), pages 484-499.
    3. Rivera Diaz, Alexandre & Kaya, Eylem & Zarrouk, Sadiq J., 2016. "Reinjection in geothermal fields − A worldwide review update," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 105-162.
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