热储上下岩层热补偿作用对CO2羽流地热系统性能的影响Influenceof.PDF

研究论文 DOI: 10.11949/j.issn.0438-1157 热储上下岩层热补偿作用对CO 羽流地热系统性能的影响 2 李静岩 刘中良* 周宇 李艳霞 (北京工业大学环境与能源工程学院，传热强化与过程节能教育部重点实验室，北京 100124) 摘要：二氧化碳羽流地热系统（CPGS ）能够在直接开采地热的同时实现CO2 的地质封存，热储上侧和下侧岩层的热补偿 作用是影响CPGS 性能的重要因素。本文建立了三维盖岩-热储-基岩整体模型，研究了热补偿作用对CPGS 采热性能及热 储内岩石和流体温度演化过程的影响，为优化CPGS 设计、提升CPGS 的系统经济性和工程应用提供了理论参考。研究结 果表明：热补偿作用减小了生产流体在竖直方向上的温度差异及系统运行后期生产流体温度下降的速率，有效延长系统运 行寿命，使系统获得更好的采热性能和更稳定的产能输出；考虑热补偿时系统总热开采量明显提高；与盖岩相比，基岩的 热补偿作用更强。 关键词：岩层；热储；热补偿；二氧化碳；地热系统；多孔介质；数值模拟 中图分类号：TK 124 文献标识码：A 文章编号 Influence of thermal compensation of geothermal reservoir rock formation on CO plume geothermal system performance 2 LI Jingyan LIU Zhongliang* ZHOU Yu LI Yanxia (Beijing University of Technology, College of Environmental and Energy Engineering, The Education Ministry Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing 100124) Abstract: Carbon dioxide plume geothermal system (CPGS) can be used to exploit geothermal energy and realize carbon dioxide geological sequestration simultaneously. The thermal compensation from the rock formation around the geothermal reservoir is one of the important factors that affect the performance of CPGS. Based on a three dimensional base and cap rocks enclosed heat reservoir model, the influences of the thermal compensation on the temperature evolutionary process of the rock and fluid in the geothermal reservoir and the heat collection performance of CPGS were studied numerically. The distribution of geothermal reservoir temperature and the temperature of production fluid were compared against that without consideration of the therm