CO2注入对多相流体吸附和页岩气生产的巨大效应:来自分子动力学的证据
Jiawei Li1,2, Binhui Li1,2, Yong Liu1,2
1State Key Laboratory of Continental Shale Oil, Daqing 163712, China.
Langmuir : the ACS journal of surfaces and colloids
|June 21, 2024
概括
二氧化碳 (CO2) 注射通过排放天然气,提高了页岩中甲的回收. 这项研究显示,孔隙显著影响吸附和回收,湿度影响气体储存和甲释放.
科学领域:
- 地质化学和石油工程
- 环境科学与工程环境科学与工程
背景情况:
- 非传统的气体储将甲储存在纳米孔中,需要有效的回收方法.
- 二氧化碳 (CO2) 注入提供了增强的甲回收和温室气体减排的双重好处.
- 了解页岩纳米孔中的流体流动对于优化二氧化碳封存和气体提取至关重要.
研究的目的:
- 通过在页岩中注入二氧化碳来研究增强气体回收 (EGR) 的微观机制.
- 开发一个实用的页岩矩阵模型,模拟分子动力学 (MD) 和大规范蒙特卡洛 (GCMC) 模拟的自然地下条件.
- 阐明孔隙结构,水分和盐溶液对气体吸附,封存和甲回收的影响.
主要方法:
- 开发一种创新的,实用的页岩矩阵模型,用于模拟地下环境.
- 分子动力学 (MD) 的应用来分析页岩纳米孔中的多相,多组件流体流.
- 利用大法典蒙特卡洛 (GCMC) 模拟来研究在不同地下条件下的气体吸附和封存.
主要成果:
- 页岩层中的孔隙对气体吸附和回收效率都有很大的影响.
- 基基质矩阵中的纳米孔主要控制气体吸附,而裂则主要用于气体储存.
- 湿度对二氧化碳的吸附和储存有负面影响,但通过二氧化碳注射增强了甲回收.
- 盐溶液和乙进一步抑制了气体吸附,但促进了排离过程.
结论:
- 二氧化碳注入极大地影响了页岩层中的流体运输,进步了对微观气体流的理解.
- 该研究提供了对气体回收机制的原子层次见解,这对于低碳能源发展至关重要.
- 实际的页岩矩阵建模和模拟方法对于优化页岩储水中的增强气体回收和碳封存至关重要.
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