A method is described whereby the motion of the interface between two liquids of equal viscosity and density moving through a porous medium in systems of complex pressure distribution may be obtained by the use of electrolytic models. Experimental results for certain simple cases are compared with results obtained analytically and shown to be accurate to within 95ndash;98 percent. Illustrations are given of more complex cases showing the application of these models to some practical problems of oil field technology.
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