The gas pseudopressure and pseudotime have significantly improved the accuracy of the gas reservoir engineering analysis. However, the cumbersome calculations involved in evaluation of the pseudo—functions have hindered their application in gas engineering practice. This paper introduces simple analytical expressions for evaluation of the gas pseudopressure and pseudotime. The analytical expressions have been developed with aid of the polynomial regression analysis.

The polynomials provide a quick, yet accurate method of calculating gas pseudo—functions. The comparison of the values determined from the polynomials and the published values of the psuedopressure and pseudotime indicate only 0.3 percent difference. This is well within the range of accuracy for engineering analysis.

The polynomials can significantly enhance the utilization of the gas pseudo—function in gas reservoir engineering applications and the gas reservoir simulation.

You can access this article if you purchase or spend a download.