Effect of the Number of Working Wells on the Seasonal Operation of the Compressed CO2 Energy Storage System in Aquifers〖STBZ〗

doi:10.13438/j.cnki.jdzk.2026.01.009

Abstract

Abstract: To clarify the influence of the number of working wells on the operational performance of seasonal aquifer compressed CO₂ energy storage systems,three three-dimensional numerical models of well groups - gas storage reservoirs with different numbers of working wells (9,5,and 3) were established.The T2WELL numerical simulation software was used to investigate the seasonal cyclic operation process of the energy storage system under different numbers of working wells.The results showed that when the number of working wells decreased from 9 to 3,the maximum pressure at the wellhead of the central well increased from 17.42 MPa to 18.23 MPa,and the maximum temperature at the wellhead of the central well rose from 59.21 ℃ to 60.18 ℃.The maximum energy efficiency of the energy storage system droped from 1.028 55 to 1.027 74.This indicates that the number of working wells significantly affects the CO₂ migration pattern and pressure/temperature transfer process within the wellbore - formation system.Therefore,in practical engineering,the number of working wells can be increased to reduce the pressure/temperature during the injection stage of the energy storage system's cyclic operation,thereby enhancing the energy efficiency of the energy storage system.

Key words: number of working wells, aquifer-based compressed CO₂ energy storage system, seasonal cycles, numerical simulation

LAI Yangzhi, LI Yi, HUANG Leqing. Effect of the Number of Working Wells on the Seasonal Operation of the Compressed CO₂ Energy Storage System in Aquifers〖STBZ〗[J]. Journal of Jishou University(Natural Sciences Edition), 2026, 47(1): 55-66.

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Effect of the Number of Working Wells on the Seasonal Operation of the Compressed CO₂ Energy Storage System in Aquifers〖STBZ〗

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