This paper presents a new technique for transient pressure analysis, based on a general diffusivity equation for any of the different coordinate systems. Essentially, this method consists in the identification of a flow exponent n for which the pressure resposne graphed in a log-log scale in terms of t1−n|p′(t)| versus t would show a horizontal behavior. It is demonstrated that the value of this exponent corresponds to the flow pattern (diagnosis; for example, linear, radial, spherical, etc., flows ), and the intercept is inversely related to the formation conductivity. For cases of highly heterogeneous formations of fractal propeties, the value of the n exponent could be different from any of the most well known exponenet values (linear;1/2; radial, 0; spherical: -1/2; bilinear: ¼; and pseudosteady state: 1).

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