Numerical Simulation of Gas Injection for Condensate Revaporization in Gas Condensate Reservoirs. A Field Case Study

Abstract

Abstract Gas productivity in a gas condensate reservoir declines due to the presence of two-phase fluid present near well bore due to bottomhole pressure lower than dew point pressure. This accumulated condensate reduces relative permeability to gas impairing flow rate and causing a reduction in productivity. This paper introduces a method of injecting gas into near wellbore region to re-vaporize the condensates and improve the permeability of gas and increase productivity. This is achieved by conducting numerical simulations of gas injection techniques by comparing a no-injection case scenario and an injection case scenario. The effect of temperature and compositional effect of injected gas into the reservoir is analyzed, and its impact on increased productivity from the reservoir is recorded. The reservoir is modeled with an in-depth analysis of fluid phase behavior and composition and simulated using Compositional simulation tools from CMG. Results from simulation shows an increment of about 7.5% increase in gas production and about 8% increase in oil produced at a temperature of about 200 deg F considerably higher than 2.4% and 4% gas and oil produced at lower injected temperature of 120 deg F. The above results are also dependent on composition of injected fluids.