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A Study on the Optimal Design of Subsurface Pumping Energy Storage Under Varying Reservoir Conditions

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  • Zhiwen Hu

    (Chongqing University, Chongqing 400044, China)

  • Hanyi Wang

    (Chongqing University, Chongqing 400044, China)

Abstract

To foster innovation in stored energy solutions and advance the development of green energy, this work presents a novel energy storage patented technology which involves storing energy in subsurface fractures through pumping. A new mechanical model was established to examine how variations in fracture size and operating parameters (i.e., injection and flow-back rates) modulate the scale and efficiency of energy storage under various geological conditions, and an optimized design scheme is proposed. The study demonstrates that both the scale and efficiency of energy storage are influenced by geological conditions. Selecting reservoirs with greater fracture toughness or lower permeability can achieve higher efficiency. Additionally, increasing reservoir fracture toughness also significantly enhances the scale of energy storage. Variations in geological conditions have a small impact on the optimal design of fracture size and injection/flow-back rate. Whether dealing with shallow penny-shaped fractures or deep elliptical fractures, using a moderate injection/flow-back rate in larger fractures is the optimal approach. The model presented in this paper is essential for tackling design challenges and interpreting data in subsurface pumping energy storage field applications.

Suggested Citation

  • Zhiwen Hu & Hanyi Wang, 2025. "A Study on the Optimal Design of Subsurface Pumping Energy Storage Under Varying Reservoir Conditions," Energies, MDPI, vol. 18(19), pages 1-27, October.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:19:p:5252-:d:1764252
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    References listed on IDEAS

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