Underground performance assessment of compressed CO2 energy storage in aquifers by thermal-hydro-mechanical coupling method

Yi Li, Yinjiang Liu, Hao Yu, Xian Luo, Yi Li, Dong Tang, Guijin Zhang and Yaning Liu

Energy, 2025, vol. 324, issue C

Abstract: To comprehensively assess the underground performance of compressed CO2 energy storage in aquifers (CCESA) and accurately capture the interactions of thermo-hydro-mechanical (THM) processes, a simulator integrating wellbore-reservoir coupling and THM coupling is developed by further considering nonlinear wellbore multiphase flow and geomechanical processes. The simulator is validated through geological CO2 sequestration (GCS) benchmark tests and the TOUGH-FLAC simulator. The THM response and the performance of CCESA, as well as the impact of temperature and geomechanical effects on system performance, are analyzed. Results show that, under THM simulation conditions, changes in effective stress and displacement show that the temperature effect predominantly governs the geomechanical processes. The energy round-trip efficiency reaches 100.31 % due to the geothermal supply. Comparative analyses show that mechanical deformation mitigates pressure and temperature fluctuations. While reservoir cooling reduces system pressure, it intensifies pressure fluctuations and enhances the productive CO2 mass rate. Mechanical deformation decreases the mass fraction of productive CO2 by 0.005 % but increases the energy rate by 0.8 × 105 W and energy round-trip efficiency by 0.06 %.

Keywords: Energy storage; CCESA; THM couplings; Energy efficiency; Nonlinear wellbore multiphase flow (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:324:y:2025:i:c:s0360544225015877

DOI: 10.1016/j.energy.2025.135945

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