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Two-phase fluid flow in geometric packing.

Aureliano Sancho S Paiva1, Rafael S Oliveira2, Roberto F S Andrade3

  • 1Instituto de Física, Universidade Federal da Bahia, 40210-210 Salvador, Brazil.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 4, 2015
PubMed
Summary
This summary is machine-generated.

This study shows how obstacles affect oil drainage in a channel. More porous regions retain less oil, especially at low flow rates, with injection speed also influencing retention.

Keywords:
Apollonian packingbi-phase flowoil drainage

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Area of Science:

  • Fluid dynamics
  • Porous media physics
  • Computational physics

Background:

  • Investigating multiphase flow in porous media is crucial for resource recovery and environmental studies.
  • Understanding fluid displacement in heterogeneous environments is complex due to varying pore structures.
  • Previous models often simplify porous regions, limiting their applicability to real-world scenarios.

Purpose of the Study:

  • To quantify retained oil during water invasion in a channel with an obstacle plug.
  • To model an inhomogeneous porous region using Apollonian packing.
  • To analyze the impact of injection speed and obstacle geometry on oil retention.

Main Methods:

  • Utilized computational fluid dynamics (CFD) with ANSYS-FLUENT.
  • Integrated the complete set of fluid motion equations.
  • Simulated oil-water drainage in a 2D channel with an Apollonian packing of up to 17 circles.

Main Results:

  • Retained oil fraction shows complex dependence on velocity and geometric parameters.
  • Oil trapping is sensitive to the number and size of obstacles, affecting system porosity.
  • At low Reynolds (Re<4) and capillary (nc≃10⁻⁵) numbers, oil retention decreases with increasing porosity.
  • A direct relationship between injection speed and oil fraction was observed.

Conclusions:

  • Obstacle geometry and porosity significantly influence oil retention patterns.
  • Flow dynamics in inhomogeneous porous media are highly sensitive to local structural variations.
  • The study provides insights into multiphase flow behavior relevant to enhanced oil recovery and contaminant transport.