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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Investigation on CO2 permeation in water-saturated porous media with disordered pore sizes
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Investigation on CO2 permeation in water-saturated porous media with disordered pore sizes

机译：孔隙尺寸无序水饱和多孔介质二氧化碳渗透的研究

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CO2 sequestration in saline aquifers is considered to be a promising method for climate mitigation. Studies of the subsurface flow mechanisms of CO2 -brine are important for evaluation of sequestration potential and security. However, this process is complicated by the intrinsic heterogeneity of reservoir rocks. The main objective of this study was to identify CO2 distribution and saturation related to changing injection conditions, and to comprehensively compare the characteristics of different drainage processes, under small scale heterogeneous condition. An X-ray computed tomography machine and a micromodel were introduced to investigate the CO2/brine drainage process from pore to core scale in a wide range of injection rates at static and transient states, respectively. Four types of drainage experiments were conducted. Horizontal and vertical (upward) flow directions in a micromodel setup at ambient conditions and vertical (upward and downward) flow directions in a core-flood setup at in-situ conditions. Based on experimental results, it is found that, a higher injection rate gives rise to a higher displacement efficiency but a lower sweep efficiency. The stability of CO2 displacing front become weak with drainage development. The difference in pore structure leads to different CO2 saturation variation with CO2 injection rates change. Even the sand pack is almost homogenous at core scale, the impact of heterogeneous porosity is enhanced with increasing flow rates in upward drainage, while it weakens in downward drainage.
机译：盐水含水层中的CO2螯合被认为是一种有希望的气候缓解方法。 CO2血液地下流动机制的研究对于评估封存潜力和安全性很重要。然而，该过程对水库岩石的内在异质性复杂化。本研究的主要目的是鉴定与改变的注射条件相关的CO2分布和饱和度，并在小规模异质条件下全面地比较不同排水过程的特征。引入了X射线计算机断层扫描机和微仪器，以分别在静态和瞬态状态下从孔隙到核心尺度的CO 2 /盐水排水过程。进行了四种类型的排水实验。水平和垂直（向上的）流动方向在Microdel设置的环境条件下，在原位条件下在核心洪水设置中的垂直（向上和向下）流动方向。基于实验结果，发现，较高的注射率导致更高的位移效率，但扫描效率较低。 CO2位移前沿的稳定性越来越弱引流发育。孔隙结构的差异导致不同的CO2饱和度变化与CO2注射率变化。即使是砂囊几乎是核心规模的均匀，也随着向上排水的向上排水的流速增加而增强了异质孔隙率的影响，同时在向下排水中削弱。

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