Understanding the Role of Water Phase Continuity on the Relationship Between Drainage Rate and Apparent Residual Saturation: A Dynamic Network Model Study

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• 作者：Tohren C. G. Kibbey ; Benyamin Naghavi ; Lili Hou
• 关键词：Unsaturated flow ; Residual saturation ; Dynamic effects ; Capillarity ; Pore network model
• 刊名：Transport in Porous Media
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：112
• 期：3
• 页码：689-705
• 全文大小：1,335 KB
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• 作者单位：Tohren C. G. Kibbey (1)
  Benyamin Naghavi (1)
  Lili Hou (1)
  
  1. School of Civil Engineering and Environmental Science, University of Oklahoma, 202 W Boyd Street, Rm. 334, Norman, OK, 73019, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Industrial Chemistry and Chemical Engineering
  Civil Engineering
  Hydrogeology
  Mechanics, Fluids and Thermodynamics
  
• 出版者：Springer Netherlands
• ISSN：1573-1634

文摘

When water drains from a porous medium, a small quantity of residual water typically remains trapped in the medium. The residual water saturation, \(S_{\mathrm{wr}}\), is a measure of the ratio of the volume of residual water to the volume of voids in the porous medium. While conventional multiphase flow concepts suggest that \(S_{\mathrm{wr}}\) has a single value that is a property of the fluids and medium, significant evidence exists that \(S_{\mathrm{wr}}\) may actually have a dynamic component, exhibiting different observed values when drainage takes place at different rates. Previous work by the authors used experimental measurements to explore this phenomenon. The work described here further explores the phenomenon through the use of a dynamic pore network model specifically designed to study the effects of changing fluid continuity in porous media resulting from dynamic drainage. The model is based on cylindrical pore throats and volumeless pore bodies. The relatively simple structure of the model makes it well suited to the purposes of the work, in that it provides a mechanism to simulate the effect of fluid continuity on drainage from a spatially random porous medium defined by a minimal number of parameters. Results suggest that the phenomenon may occur as a result of pore-scale preferential flow causing desaturation of the porous medium at the water-wet boundary. Significant sensitivity is observed to both porous medium configuration and resistance to water flow across the water-wet boundary.