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Using pore-solid fractal dimension to estimate residual LNAPLs saturation in sandy aquifers:A column experiment

Journal of Groundwater Science and Engineering 2022年第1期10卷 87-98页

作者： Lin Sun Shuai-wei Wang Cai-juan Guo Chan Shi Wei-chao Su Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences ResourcesShijiazhuang 050061China Key Laboratory of Groundwater Sciences and Engineering Ministry of NaturalShijiazhuang 050061China

The“tailing”effect caused by residual non-aqueous phase liquids(NAPLs)in porous aquifers is one of the frontiers in pollution hydrogeology *** on the current knowledge that the residual NAPLs is mainly controlled by the pore structure of soil,this study established a method for evaluating the residual saturation of NAPLs by investigating the fractal dimension of porous *** this study,the soil column experiments of residual light NAPLs(LNAPLs)in sandy aquifer with different ratios of sands and soil were carried out,and the correlation between the fractal dimension of the medium,the residual of LNAPLs and the soil structure parameters are statistically analyzed,and its formation mechanism and main control factors are *** results show that:Under our experimental condition:(1)the fractal dimension of the medium has a positive correlation with the residual saturation of NAPLs generally,and the optimal fitting function can be described by a quadratic model:S_(R)=192.02 D2-890.73 D+1040.8;(2)the dominant formation mechanism is:Smaller pores in the medium is related to larger fractal dimension,which leads to higher residual saturation of NAPLs;stronger heterogeneity of the medium is related to larger fractal dimension,which also leads to higher residual saturation of NAPLs;(3)the micro capillary pores characterized by fine sand are the main controlling factors of the formation *** is concluded that both the theory and the method of using fractal dimension of the medium to evaluate the residual saturation of NAPLs are *** study provides a new perspective for the research of“tailing”effect of NAPLs in porous media aquifer.

关键词： residual saturation NAPLs Pore structure Fractal Tailing effect

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MRI study on CO2 flooding characteristics in n-decane saturated glass bead packs

MRI study on CO2 flooding characteristics in n-decane satura...

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2011 International Conference on Energy and Environment(ICEE 2011)

作者： Yu Liu Yongchen Song Yuechao Zhao Tonglei Wang Lanlan Jiang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology

CO2 enhanced oil recovery（EOR） offers the potential for both increasing domestic oil production and storing significant volumes of carbon dioxide emissions. Laboratory scale experiments are effective methods for the visualization and quantification of flooding characters. In this paper a series of experiments on n-decane displacement by both gaseous and supercritical CO2 flooding in glass bead pack were carried out using a 400 MHz magnetic resonance imaging（MRI） system. Images were obtained for direct visualization of the displacement procedures as CO2 was injected and processed to quantify the displacement parameters using image intensity analysis. Channeling and viscous fingering phenomena appeared obviously in the case of gaseous CO2 flooding. But there was no such two phase flow behavior in supercritical CO2 flooding because of the miscibility of supercritical CO2 with n-decane. residual saturation of ndecane in glass bead packs was evaluated to be 32.2% for gaseous CO2 flooding and 14.5% for supercritical CO2 flooding. It was proved that miscible phase displacement can improve the efficiency of CO2 flooding notably.

关键词： MRI CO2 flooding N-decane Image intensity residual saturation

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