Investigating Skin Factor Caused by Production Rate in Gas Condensate Reservoirs with Non-darcy Flow

It is essential to understand gas condensate reservoir behaviour correctly. A special way of meeting this requirement is taking the advantage of well testing analysis. The simultaneous presence of condensate and gas in a reservoir alters the gas relative permeability around a production well, which influences the well test responses. Moreover, another parameter which alters this behavior more is non-Darcy flow of fluid around the well. Furthermore, some factors like the rate of production and type of gas condensate reservoirs play a crucial role in condensate formation. These factors have important impacts on the formation of condensate. In other words, they add an additional skin factor caused by the formation of condensation around wells. The aim of this study is to consider the correlation between production rate and skin factor. Moreover, the method is using data obtained from a compositional reservoir model to investigate the transient behavior around the producing well and reinterpreting the results of the reservoir model during well test analysis. Finally, in this way, by creating different scenarios of production and build-up tests, the effects of downward and upward trends of the production rate on the condensate formation and its effect on the well-test data have been examined by us. Some weight functions for representing the production rate changes versus skin factor are developed as well.