[Thesis]. Manchester, UK: The University of Manchester; 2020.
Abstract of thesis submitted by Mohammad Javad Shojaei for the Degree of Doctor of
Philosophy and entitled Ă˘Pore-scale dynamics of foam flow in porous mediaĂ˘ on
1th September 2019.
Understanding the dynamics of foam flow in porous media is of great importance to
many industrial processes such as soil remediation, CO2 sequestration, and enhanced
oil recovery. The efficiency of the foam-liquid displacement depends on several parameters
relating to the surfactant properties, boundary conditions, and the transport properties
of the porous media. Thus, it is essential to understand the dominant mechanisms controlling
foam flow in porous media.
In this dissertation, several parameters such as the surfactant properties, external
conditions for instance gravitational effet, the pore size of porous media and the
aperture variation of the fracture have been shown to influence the dynamics of foam
flow in porous media. The obtained results revealed the adverse effect of fluid separation
by gravity segregation and fingering of the gas phase into the foam bank at high flow
rates on the efficiency of the foam displacement in porous media. However, our results
showed pore size of porous media has a stronger influence on foam stability compared
to the effect of type of oil. Also, it was found that there is no meaningful correlation
between the stability of oil in bulk-scale to pore scale.
The obtained results in fractured media showed that fracture wall roughness strongly
increases the foamĂ˘s apparent viscosity and shear rate. Moreover, foam bubbles traveling
in regions of larger aperture exhibit larger velocity, size, a higher coarsening rate,
that are subjected to a higher shear rate. Additionally, in this dissertation, the
effect of the synergy between different surfactant types and nanoparticles on the
stability of foam was investigated.
The results reported in this dissertation shed new insight into the behavior of foam
in porous media. The results of this dissertation have been published in 3 peer-reviewed
journal papers with another one under review.