CHARACTERISTICS OF GAS CONDENSATE FLOW IN POROUS MEDIA CONSIDERING CAPILLARY NUMBER AND NON-DARCY EFFECT

It is found recently in numerous theoretical and experimental researches that capillary number and non-darcy effect caused by high velocity flow has magnificent effect on relative permeability within the immediate vicinity of the well. The classic methods only considering non-darcy effect are impossible to characterize the real flow behavior both gas and condensate accurately. So how to understand and to consider the effects caused by these two effects is important to analyze gas condensate flow and predict production performance. The paper defined a solution problem of two phase flow both gas and condensate and derived the inflow performance relationship equation under pseudo steady state. Based on three zones flow mechanism, the integrated consideration of capillary number and non-darcy effect is firstly presented. Applied analysis showed some new characteristics of gas/condensate relative permeability and distribution under high velocity flow. Comparing with the different inflow performance relationship models, the result indicates that present method is more accurate than classic ones to predict the production performance and to evaluate the productivity.