The Effect of Relative Permeability on the Well Testing Behavior of Naturally Fractured Lean Gas Condensate Reservoirs

摘要

Gas condensate reservoirs show complicated thermodynamic behavior when their pressure reduces to under dew point pressure. Condensate blockage around the producing well cause significant reduction of production rate as well bottom-hole pressure drops below saturation pressure. The main objective of this work was to examine the well test analysis of naturally fractured lean gas condensate reservoir and investigate the effect of condensate formed around the well bore on behavior of single phase pseudopressure and its derivative curves. In this work a naturally fractured lean gas condensate reservoir is simulated with compositional simulator. Different sensitivity analysis done on Corey parameters and result of simulator is fed to analytical well testing software. For consideration of these phenomena 18 compositional models with capillary number effect are constructed. Matrix relative permeability obeys Corey's relative permeability and relative permeability in fracture is linear. Well testing behavior of these models are studied and interpreted. Results show different sensitivity analysis on relative permeability of matrix does not have strong effect on well testing behavior even though most part of the matrix around the well is occupied with condensate.