Trapped solvent droplets within a water-filled column packing can be liberated by injection of a partitionable solute which induces coalescence to form larger, easily-deformable droplets. This result, an outcome of the Marangoni effect, is normally much more marked when the solute transfers from solvent into aqueous phase; however, some solutes can be effective in both directions of transfer. A proposal is made for a novel method of utilising the Marangoni effect to achieve EOR by solute flooding, followed by a repeated water (or gas) drive; unlike a previously reported, unsuccessful study, this takes advantage of the non-equilibrium nature of the effect.

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