A Pseudopressure-Pseudotime Transformation for the Analysis of Gas Well Closed Chamber Tests

Abstract

This paper presents methods for the analysis of gaswell, closed-chamber tests. It is shown that, in most cases, pseudopressure and pseudotime can be used to correlate gas-well, closed-chamber test results with the analogous liquid, slug-test solutions. This allows data from gas-well, closed-chamber tests to be analyzed using slug-test analysis procedures that assume single-phase flow of a slightly compressible liquid of constant compressibility and viscosity within the reservoir. Multirate analysis techniques were found to be applicable to gaswell, closed-chamber tests in terms of pseudopressure and time, not pseudotime.