KPIM of gas/condensate productivity: Prediction of condensate/gas ratio using reservoir volumetric balance

Abstract

A new approach for forecasting viability of gas condensate wells and calculating Condensate Gas Ratio (CGR), using simpler techniques is presented. The calculation uses a volumetric balance model for reservoir system, standardized and modified correlations, equation of state and a vapor-liquid equilibrium technique. The technique has been extended to include mass transfer and also to allow for the changes in produced fluid composition due to the formation of the condensate bank. The approach will provide a useful tool for rapid forecasts of condensate well performance, for examining the effects of condensate blockage in different well types or for studying sensitivities. It is also valuable where simple models of condensate reservoir performance are required for use in integrated studies. © 2006 Asian Network for Scientific Information.