Nonstatic pressure history analyses for gas reservoirs

A method was developed for using nonstatic pressure measurements directly in gas reservoir material balances composed of various energy mechanisms. Applying this method leads to simultaneous determinations of the reservoir's average static pressure history, gas-in-place, and other parameters relevant to water influx and effective compressibility. The proposed method avoids the deficiencies of other techniques through a simple coupling of the well-known pseudosteady-state flow and material-balance equations.