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Capillary saturation and desaturation.

R Hilfer1, R T Armstrong2, S Berg3

  • 1ICP, Universität Stuttgart, 70569 Stuttgart, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a new theoretical expression for capillary desaturation curves, revealing that plateau saturation can differ from residual nonwetting saturation. It analyzes interactions between trapped fluid ganglia during desaturation experiments.

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Area of Science:

  • Porous Media Physics
  • Fluid Dynamics
  • Multiphase Flow

Background:

  • Capillary desaturation experiments yield trapped mesoscopic ganglia.
  • Interactions between these ganglia are analyzed using established physical laws.

Purpose of the Study:

  • Introduce a novel theoretical expression for capillary number correlations.
  • Analyze capillary desaturation curves, considering hysteresis and fluid wettability.
  • Investigate the mesoscopic length scale in two-phase flow.

Main Methods:

  • Analysis of experimental evidence for mesoscale cluster interactions.
  • Development of a theoretical expression for capillary desaturation curves.
  • Comparison of the theoretical expression with recent experimental data.

Main Results:

  • A new theoretical expression for capillary desaturation curves is presented.
  • The expression relates desaturation curves to stationary capillary pressures and relative permeabilities.
  • The plateau saturation may differ from the residual nonwetting saturation, accounting for hysteresis and fluid properties.

Conclusions:

  • The theoretical expression is derived within traditional two-phase flow theory.
  • It offers a new perspective on capillary desaturation phenomena.
  • The study highlights the significance of mesoscopic length scales and hysteresis effects.