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Study on pressure characteristics and displacement efficiency of compressed air energy storage in depleted oil and gas reservoirs

Author

Listed:
  • Hu, Zhenhai
  • Chen, Wei
  • Tian, Yingnan
  • Dong, Zhen
  • Li, Yuchen
  • Lai, Yanhua
  • Xue, Xiaodai

Abstract

Depleted oil and gas reservoirs have comprehensive geological information and a large number of pore spaces, which have the potential to be used as compressed air storage. Therefore, this paper explores the potential of using depleted oil and gas reservoirs as compressed air storage. Based on the phase-field method (PFM), a pore-scale compressed air–water two-phase flow model is established, to study the flow of compressed air in porous reservoirs under different temperatures, pressures, flow velocities, and contact angles, analyze the pressure characteristics and displacement efficiency during displacement, and study the influence of cyclic storage on the gas storage capacity of porous reservoirs. The results show that the pressure characteristics and displacement efficiency do not change significantly within the range of the general temperature and pressure of compressed air. With the increase of flow velocity, the required displacement pressure difference and flow pressure difference increase, but the pressure fluctuation during displacement decreases and the air saturation decreases. When the contact angle increases, the required displacement pressure decreases, the flow pressure difference decreases, and the pressure fluctuation during displacement decreases. When the contact angle increases to neutral wetting, the air saturation after displacement decreases. With the increase of storage rounds, the required displacement pressure difference decreases, the flow pressure difference has a downward trend, the pressure fluctuation increases slightly during displacement, the proportion of total air capacity and cushion gas in pores increases until stable, and the proportion of available working gas decreases until stable.

Suggested Citation

  • Hu, Zhenhai & Chen, Wei & Tian, Yingnan & Dong, Zhen & Li, Yuchen & Lai, Yanhua & Xue, Xiaodai, 2025. "Study on pressure characteristics and displacement efficiency of compressed air energy storage in depleted oil and gas reservoirs," Energy, Elsevier, vol. 339(C).
    • Handle: RePEc:eee:energy:v:339:y:2025:i:c:s0360544225045347
    DOI: 10.1016/j.energy.2025.138892
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    References listed on IDEAS

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    1. Barbara Uliasz-Misiak & Jacek Misiak, 2024. "Underground Gas Storage in Saline Aquifers: Geological Aspects," Energies, MDPI, vol. 17(7), pages 1-23, March.
    2. Budt, Marcus & Wolf, Daniel & Span, Roland & Yan, Jinyue, 2016. "A review on compressed air energy storage: Basic principles, past milestones and recent developments," Applied Energy, Elsevier, vol. 170(C), pages 250-268.
    3. Liang, Fachun & He, Zhennan & Meng, Jia & Zhao, Jingwen & Yu, Chao, 2023. "Effects of microfracture parameters on adaptive pumping in fractured porous media: Pore-scale simulation," Energy, Elsevier, vol. 263(PC).
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