Foam improved oil recovery: foam front displacement in the presence of slumping

Elizabeth Mas-Hernández, Paul Grassia, Nima Shokri

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15 Citations (Scopus)
48 Downloads (Pure)


Foam is often used in improved oil recovery processes to displace oil from an underground reservoir. During the process, the reservoir is flooded with surfactant, and then gas is injected to produce foam in situ, with the foam front advancing through the reservoir. Here the effect of surfactant slumping (downward movement of surfactant in relation to a lighter phase) upon the advance of a foam front is presented. Slumping which can be associated with foam drainage, coarsening and collapse, causes a rise in mobility of the foam front specifically near the top of the front. The description of a foam front displacement for an initially homogeneous foam mobility is therefore modified to account for slumping-induced inhomogeneities. Numerical solution for the front shape shows that, although slumping transiently produces a localised concave region on the otherwise convex front, this concavity has little effect on the long term front evolution. In fact in the long-time limit, a convex kink develops on the front: an analytical solution describing the convex kink agrees very well with the numerics.
Original languageEnglish
Pages (from-to)123-132
Number of pages10
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Early online date31 Dec 2014
Publication statusPublished - 20 May 2015


  • improved-oil recovery
  • foam
  • pressure-driven growth
  • porous media
  • numerical solution
  • analytical solution

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