Simultaneous injection of water above gas for improved sweep in Gas Enhanced Oil Recovery (EOR): An analytical and simulation study on non-uniform injection and sweep

Gas EOR processes can have microscopic displacement efficiency as large as 100%, but suffer from poor sweep of the reservoir. Injected gas has tendency to segregate at the top of the reservoir due to density difference and gravity. Water-alternating-gas injection was proposed by Caudle and Dyes (1958) to reduce the effect of adverse mobility...