Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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The Effect of Flow Rate on the Process of Immiscible Displacement in Porous Media

다공성 매체 내 비혼성 대체 과정에서 주입 유량이 거동 양상에 미치는 영향

  • Park, Gyuryeong (Department of Energy Resources Engineering, Pukyong National University) ;
  • Kim, Seon-ok (Department of Energy Resources Engineering, Pukyong National University) ;
  • Lee, Minhee (Department of Earth Environmental Science Engineering, Pukyong National University) ;
  • Wang, Sookyun (Department of Energy Resources Engineering, Pukyong National University)
  • 박규령 (부경대학교 에너지자원공학과) ;
  • 김선옥 (부경대학교 에너지자원공학과) ;
  • 이민희 (부경대학교 지구환경과학과) ;
  • 왕수균 (부경대학교 에너지자원공학과)
  • Received : 2017.12.12
  • Accepted : 2018.01.08
  • Published : 2018.03.31
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Abstract

A series of experiments using transparent micromodels with an artificial pore network etched on glass plates was performed to investigate the effects of flow rate on the migration and distribution of resident wetting porewater (deionized water) and injecting non-wetting fluid (n-hexane). Multicolored images transformed from real RGB images were used to distinguish n-hexane from porewater and pore structure. Hexane flooding followed by immiscible displacement with porewater, migration through capillary fingering, preferential flow and bypassing were observed during injection experiments. The areal displacement efficiency increases as the injection of n-hexane continues until the equilibrium reaches. Experimental results showed that the areal displacement efficiency at equilibrium increases as the flow rate increases. Close observation reveals that preferential flowpaths through larger pore bodies and throats and clusters of entrapped porewater were frequently created at lower flow rate. At higher flow rate, randomly oriented forward and lateral flowpaths of n-hexane displaces more porewater at an efficiency close to stable displacement. It may resulted from that the pore pressure of n-hexane, at higher flow rate, increases fast enough to overcome capillary pressure acting on smaller pore throats as well larger ones. Experimental results in this study may provide fundamental information on migration and distribution of immiscible fluids in subsurface porous media.

Keywords

References

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