Abstract
Summary In this paper, I present the general characteristics of the Gladfelter deconvolution method, which has been used for determining the constant-rate behavior of a system from measured flow rate and pressure. The validity of the method is established for different rate variations and flow geometries (radial, linear, and spherical). The method works well for linear and exponential flow variations and fails for the general flow case. The commonly assumed first semilog straight line resulting from the Gladfelter deconvolution is instead a tangential line parallel to the final semilog straight line owing to a constant-flow-rate period. New solutions are presented for cylindrical, linear (fractured), and spherical wellbore flow geometries with exponential-flow and constant-storage cases. In addition, useful asymptotic solutions are given for the determination of reservoir parameters from the Gladfelter method.
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