Summary A theory of 1D dispersion-free displacement in porous media is used toreveal features of floods in which three phases flow simultaneously. Theanalysis shows how the sequence of compositions realized in given classes ofproblems can be recognized from a single diagram. It also explains whythree-phase routes of physical interest shock into and out of tie-triangles, why composition routes measured during relative permeability experiments oftenare identical through the three-phase region, and how an equilibrium tertiarydisplacement can evoke either an oil bank that runs ahead of the phasecontaining the active agent or one that breaks through with it.
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Falls et al. (1992) studied this question.
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