在CO2中对毛细血管密封的冷却效应 - 羽毛地热系统:毛细血管压力建模和泄漏评估
Chaojie Di1,2, Fei Tian1,2, Liang Zhao1,2
1Key Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
Environmental science & technology
|January 29, 2026
概括
二氧化碳羽毛地热 (CPG) 技术危及碳封存安全. 寒冷的二氧化碳循环降低了岩的密封能力,导致了大量的二氧化碳泄漏,需要采取缓解策略.
科学领域:
- 地质科学 地质科学
- 能源工程 能源工程
- 环境科学 环境科学
背景情况:
- CO2-Plume地热 (CPG) 技术使用二氧化碳用于能源提取和碳封存.
- 循环的冷CO2降低了水库温度,改变了岩石的湿透性和岩顶岩的密封能力.
- 这种变化对地下碳封存的长期安全构成威胁.
研究的目的:
- 调查冷却诱导的湿度变化如何影响CPG岩石密封能力.
- 量化与这些变化相关的二氧化碳泄漏风险.
- 制定缓解策略,以提高封存安全性.
主要方法:
- 开发了一个温度和依赖的毛细血管压力 (TSPC) 模型.
- 将TSPC模型集成到一个数值水库模拟器中.
- 进行了CPG操作的现场规模模拟,以评估二氧化碳泄漏.
主要成果:
- 降低温度使毛细血管压力降低了45%-87%.
- 卡普罗克的密封能力被大幅削弱,削弱了它防止二氧化碳突破的能力.
- 模拟显示,在一个代表性的CPG储中,有近5万的二氧化碳泄漏.
结论:
- 在CPG系统中发现了一种新型的CO2泄漏机制,原因是冷却引起的湿度变化.
- 证明了岩密封能力的显著降低.
- 提出了实际的缓解策略,以改善长期的二氧化碳封存安全性.
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