Optimization of foam treatments requires modeling or simulation of the process using a foam model that is capable of reproducing the critical properties of foam. In this work we present a simple model that is based on the relative permeability concept, and is well suited for simulation of foam processes with conventional or slightly modified numerical simulators. The model can unify un- derstanding of a number of phenomena that characterizes foam flow. The validity of the model is substantiated by experimental data. A consistent interpretation of foam breakdown, shear thin- ning effects, permeability effects, and effects of system pressure is possible with the model for gas relative permeability in foam pre- sented.
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