Fracture evaluation with pressure transient testing in low-permeability gas reservoirs. Part 1: theoretical background. Academic Article uri icon

abstract

  • The purpose of this paper is to summarize the theoretical background of methods which we have attempted to use to determine formation permeability, fracture length, and fracture conductivity in low-permeability, hydraulically fractured gas reservoirs. This summary is intended to emphasize the major strengths and weaknesses of the methods studied. These characteristics have not always been emphasized in the original literature and have, in some cases, remained obscure to the practicing engineer. This paper is a companion paper to SPE 79301, in which our experience in application of these techniques to problems arising in practice is discussed. Test analysis methods discussed in the paper include (1) a method applicable only after a 'pseudo-radial' flow pattern is developed in the reservoir, (2) a method applicable when linear flow dominates in the reservoir, (3) published type curves, with emphasis on those which include finite-conductivity fractures, (4) a modification of linear-flow techniques useful for finite-conductivity fractures, and (5) use of finite-difference reservoir simulators in a history-matching mode. (A)

author list (cited authors)

  • Lee, W. J., & Holditch, S. A

complete list of authors

  • Lee, WJ||Holditch, SA

publication date

  • January 1, 1979 11:11 AM