摘要：

The results of this study show that in the presence of foam, gas and liquid flow separately through porous media. Foam does not flow through the porous medium as a body even when the liquid and gas are combined outside the system and injected as foam. Rather, the liquid and gas forming the foam separate as the foam films break and re-form in the porous system. Liquid moves through the porous medium via the film network of the bubbles. Gas moves progressively through the system by breaking and re-forming bubbles throughout the length of the flow path. There is no free flow of gas, no continuous gas phase. Foam can be expected to improve a waterflood, or gas drive by decreasing the permeability of the reservoir rock to a displacing liquid or gas, which improves the mobility ratio.

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