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Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications

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Foam invasion through a single pore.

Aline Delbos¹, Olivier Pitois

¹Laboratoire de Physique des Matériaux Divisés et des Interfaces, Université Paris-Est, CNRS FRE 3300, 5 Boulevard Descartes, F-77454 Marne la Vallée Cedex 2, France. adelbos@polysci.umass.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|August 27, 2011

Summary

Foam flow through small pores is restricted to specific conditions. Liquid foam invasion increases liquid content threefold, while gas or liquid invasion occurs outside this regime.

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Area of Science:

Physics of complex fluids
Colloid and interface science
Multiphase flow dynamics

Background:

Understanding foam behavior in porous media is crucial for applications like enhanced oil recovery and CO2 sequestration.
Foam flow through pores smaller than bubble size presents unique challenges due to bubble deformation and rearrangement.
Previous studies have explored foam rheology but detailed experimental investigations of invasion regimes in constricted geometries are limited.

Purpose of the Study:

To experimentally investigate the invasion dynamics of liquid foams through a single pore with a diameter smaller than the bubble diameter.
To identify the critical parameters governing different invasion regimes (foam, gas, or liquid alone).
To quantify the changes in foam liquid fraction during invasion.

Main Methods:

Experimental setup involving pumping liquid foam through a microfluidic pore.
Systematic variation of dimensionless flow rate and foam liquid fraction.
High-speed imaging to observe foam-pore interactions and bubble dynamics.
Image analysis to quantify bubble size, foam structure, and liquid content.

Main Results:

Foam invasion is observed only within a restricted range of dimensionless flow rate and initial foam liquid fraction.
During foam invasion, the liquid content of the foam increases by a factor of three compared to the initial state.
Outside the foam invasion regime, either gas-only invasion (due to film rupture and T1 events) or liquid-only invasion (due to bubble jamming) is observed.

Conclusions:

The study defines distinct invasion regimes for liquid foams flowing through constricted pores.
Bubble rearrangement dynamics, including film rupture and bubble jamming, dictate the invasion mechanism.
Controlling flow rate and liquid fraction is essential to achieve desired foam invasion behavior in porous media.