Abstract
Summary This paper examines relationships between backflow of water from the invaded zone and changes in skin owing to reduced water saturation and the associated change in mobility for homogeneous reservoirs. Effects studied are governed by initial saturation profiles, relative permeabilities of water and the produced reservoir fluid, basic reservoir and fluid parameters, and the producing rate. Buckley-Leverett-type displacement is assumed in the skin zone, and production and skin-zone data needed to determine relative permeability characteristics by extensions of standard techniques are given. Methods to determine such characteristics by matching observed and computed skin-decline data are also presented.
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