The effects of production rate and initial pressure difference (pi - pdew) in well test analysis of gas condensate reservoirs

Abstract

The theoretical basis for the analysis of well test data presented in this study is the use of a pseudopressure function to linearize the flow of gas condensate in porous media. In this article different techniques to analyze gas condensate well tests using single-phase pseudopressure and two-phase pseudopressure are considered. The main objective of this work was to examine the available methods for well test analysis of gas condensate reservoirs and investigate the effect of production rate and initial pressure difference (pi – pdew ) on these methods. Sensitivities of the two-phase pseudopressure methods and single-phase method are presented. However, at higher endpoint relative permeability, a lower prediction from single-phase pseudopressure analysis is obtained. A lower difference between pi and pdew causes larger condensate bank size and larger Region 2 and therefore better prediction of Raghavan's approach.