Modeling Near-Miscible Gas Foam Injection in Fractured Tight Rocks and Its Challenges

Unlocking oil from tight reservoirs remains a challenging task, as the existence of fractures and oil-wet rock surfaces tends to make recovery uneconomic. Injecting gas in form foam is considered feasible technique such for providing conformance control reducing gas-oil interfacial tension (IFT) that allows injected fluids enter matrix. This paper presents modeling strategy aims understand behavior near-miscible injection find optimal depending on reservoir pressure availability. Corefloods with following into fractured were simulated history matched using compositional commercial simulator. The simulation results agreed experimental data respect both gradient during schedules. Additional simulations carried out by increasing strength changing composition. It was found or proportion ethane could boost production rate significantly. When gets miscible near miscible, model would face serious challenges, phases not be distinguished simulator, while they have essentially different effects presence terms modeling. We provide in-depth thoughts discussions potential ways improve current models account conditions.