离散断裂网络对增强地热系统性能的影响,考虑到热-液压-机械-多物理场合
Haiyang Jiang1,2, He Huang3, Liangliang Guo4,5
1No.1 Institute of Geology and Mineral Resource Exploration of Shandong Province, Jinan, China.
PloS one
|April 23, 2025
概括
研究增强地热系统 (EGS) 显示,离散断裂网络 (DFN) 特性显著影响热性能. 优化断裂特性,如孔径和角度,对于高效的热提取至关重要.
科学领域:
- 地热能源工程 地热能源工程
- 储水库工程 储水库工程
- 计算地质科学计算地质科学
背景情况:
- 增强地热系统 (EGS) 中的长期冷水循环涉及复杂的热水力机械 (THM) 场演变.
- 离散断裂网络 (DFN) 的特征极大地影响EGS水库的热性能和运行效率.
研究的目的:
- 在结合的THM字段下,对DFN特征对EGS性能的影响进行数值研究.
- 分析温度依赖的水特性和冷张应力对水库行为的影响.
主要方法:
- 考虑DFN属性的EGS中的合THM场的数值模拟.
- 评估水特性变化和冷张应力对流体流动和温度分布的影响.
- 对DFN特征进行参数研究:断裂密度,孔径,井口角和断裂模式.
主要成果:
- 水的特性变化对达西速度的影响比应力场变化更大.
- 考虑到水的特性和应力效应,加大达西速度,加快温度下降.
- 增加断裂密度提高了生产达西速度,并显著影响了热回收效率.
- 断裂孔口对水库的温度场的影响比断裂密度更大.
- 较小的断裂井连接角度降低了流动阻力,增加了相当的透性.
- 主要断层组和井连接之间的均断层分布和特定的尖角是EGS的最佳选择.
结论:
- 对于优化EGS的热性能,DFN特性是关键的.
- 最佳的DFN设计包括管理断裂密度,孔径和与井口相对的方向.
- 统一的断裂模式和特定的尖角提高了EGS中的流体流动和热提取效率.
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