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Oscillation-induced displacement patterns in a two-dimensional porous medium: a lattice Boltzmann study
Olav Aursjø1, Henning Arendt Knudsen, Eirik G Flekkøy
1Department of Physics, University of Oslo, Blindern, NO-0316 Oslo, Norway. olav.aursjo@fys.uio.no
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
Summary
Oscillatory acceleration enhances wetting fluid extraction in porous media. This study reveals how fluid dynamics and oscillations influence irreducible fluid saturation and cluster size distributions for improved recovery.
Area of Science:
- Physics
- Fluid Dynamics
- Materials Science
Background:
- Two-phase flow in porous media is crucial for resource extraction and environmental remediation.
- Understanding fluid displacement under external forces is key to optimizing recovery processes.
Purpose of the Study:
- To numerically investigate the statistical behavior of two-phase flow in a 2D porous medium under transverse oscillatory acceleration.
- To analyze the impact of oscillatory stimulation on fluid saturation, cluster size distribution, and fluid recovery.
Main Methods:
- Numerical simulation of a viscous nonwetting fluid displacing a more viscous wetting fluid in a 2D porous medium.
- Application of sinusoidal oscillations transverse to the main flow direction.
- Statistical analysis of fluid saturation and cluster size distribution, including power-law and exponential cutoff fitting.
Main Results:
- The invasion process exhibits transient behavior leading to irreducible wetting fluid saturation.
- Cluster size distributions in the irreducible state follow a power law with an exponential cutoff.
- The cutoff cluster size is dependent on flow and oscillatory parameters, directly correlating with extracted fluid volume.
Conclusions:
- Oscillatory acceleration significantly enhances the extraction of wetting fluid.
- The statistical properties of remaining fluid clusters provide insights into the recovery process.
- This method offers potential for substantially increasing the efficiency of fluid extraction from porous media.
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