Investigating the effect of different gas injection scenarios on enhancing recovery of a gas condensate reservoir

Retrograde condensate gas reservoir is one of the popular and challenging gas reservoir types. In this work, the effects of three various injection gases, including N2, CO2 and lean hydrocarbon (HC) gas into a gas condenstae reservoir is studied. The simulation was done by a compositional model in CMG. The flow rates of 35, 45, 75 and 95 MMscf/d were studied for all the gases. The simulation results showed that N2 injection has much lower recovery compared to the two other cases. Also, CO2 injection showed the highest recovery during the simulated time, due to its miscibility with reservoir fluid.

Keywords:

Gas Condensate Reservoir , CMG Simulation , Gas injection , Cumulative production.