Greenhouse gas emissions have led to severe global climate change, and countries around the world are taking measures to mitigate the greenhouse effect caused by carbon emissions. Carbon dioxide capture, utilization and storage (CCUS) is emerging as a large-scale greenhouse gas emission reduction technology and can potentially become an important means to mitigate the greenhouse effect in the future. There are a series of problems in the implementation of this technology, among which the geomechanical problems due to the thermal effect should not be neglected. This paper summarizes the non-isothermal processes in CCUS and the impacts and hazards caused by the thermal effects of non-isothermal processes. We show that CO injection and sequestration will experience heat exchange with high-temperature formations and wellbores, exothermic dissolution, cooling by the Joule–Thomson effect, exothermic adsorption and exothermic hydrate formation when CO replaces CH. These non-isothermal processes can lead to risks including reservoir stability, fault activation and induced seismicity. Thermal effects can also alter reservoir characteristics, such as the effect on CO injection and storage efficiency. This work presents the challenges and future perspectives of thermodynamic studies in CCUS, which will help to fully understand the thermal effects and risks in CCUS and provide a reference for future CCUS operation, monitoring, and research.

中文翻译：

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从地质力学角度回顾 CCUS 中的非等温过程


温室气体排放导致了严重的全球气候变化，世界各国都在采取措施减轻碳排放造成的温室效应。二氧化碳捕获、利用和封存（CCUS）作为一种大规模温室气体减排技术正在兴起，有可能成为未来缓解温室效应的重要手段。该技术实施过程中存在一系列问题，其中热效应引起的地质力学问题不容忽视。本文总结了CCUS中的非等温过程以及非等温过程的热效应造成的影响和危害。我们表明，当 CO 取代 CH 时，CO 注入和封存将经历与高温地层和井筒的热交换、放热溶解、焦耳-汤姆逊效应冷却、放热吸附和放热水合物形成。这些非等温过程可能导致包括储层稳定性、断层激活和诱发地震活动等风险。热效应还会改变储层特征，例如对二氧化碳注入和储存效率的影响。该工作提出了CCUS热力学研究的挑战和未来展望，有助于全面了解CCUS的热效应和风险，为未来CCUS的运行、监测和研究提供参考。