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<p>The issues of curtailment of renewable energy have become key bottlenecks restricting the large-scale development of renewable energy. Based on the coaxial closed-loop geothermal system and geological energy storage, this study constructed vertical, L-shaped, and inverted T-shaped well. Numerical simulation was used to explore the effects of different well types and operation modes on heat storage and extraction performance as well as the evolution law of formation temperature, while the economic and environmental benefits under various scenarios were quantitatively evaluated. The results show that increasing the number of horizontal side wells can effectively raise the outlet temperature by 10–16 K. The inverted T-shaped well has the highest heat release power but the lowest heat storage power, which is the opposite of the vertical well. The introduction of the heat storage stage brings about higher heat release power and a longer service life of the formation, and the increase in horizontal side wells improves the stability of heat release power. Under the condition of low energy storage temperature, the inverted T-shaped well achieves the highest economic and environmental benefits, whereas the vertical well demonstrates more prominent growth rates of economic and environmental benefits between the two operation modes.</p>

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Performance comparison of thermal storage and release of coaxial closed-loop geothermal system with different well configurations

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月21日

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  • Wenbin Han,
  • Yongzhi Lei,
  • Wei Chen,
  • Xujun Gao,
  • Bo Ma,
  • Jiaojiao Lv,
  • Xianbiao Bu

摘要

The issues of curtailment of renewable energy have become key bottlenecks restricting the large-scale development of renewable energy. Based on the coaxial closed-loop geothermal system and geological energy storage, this study constructed vertical, L-shaped, and inverted T-shaped well. Numerical simulation was used to explore the effects of different well types and operation modes on heat storage and extraction performance as well as the evolution law of formation temperature, while the economic and environmental benefits under various scenarios were quantitatively evaluated. The results show that increasing the number of horizontal side wells can effectively raise the outlet temperature by 10–16 K. The inverted T-shaped well has the highest heat release power but the lowest heat storage power, which is the opposite of the vertical well. The introduction of the heat storage stage brings about higher heat release power and a longer service life of the formation, and the increase in horizontal side wells improves the stability of heat release power. Under the condition of low energy storage temperature, the inverted T-shaped well achieves the highest economic and environmental benefits, whereas the vertical well demonstrates more prominent growth rates of economic and environmental benefits between the two operation modes.