Mathematical Modeling of Enhanced Oil Recovery Using Immiscible Water Alternating Gas (IWAG) Process

The main objective of the current study was to investigate application of Immiscible Water Alternating Gas (IWAG) method in Enhanced Oil Recovery (EOR) process. In order to have a better understanding of the process, water injection as well as immiscible gas injection processes should be separately studied. Black Oil Model (BOM) was employed to reach the final equations required for estimation of pressure and saturation domains. By solving these equations all the reservoir parameters can be determined. The governing equations were discretised using Finite Volume Method (FVM). Implicit Pressure–Explicit Saturation (IMPES) formula was employed to solve the equations. Application of the EOR process was studied simulating a case study by way of the IWAG method. The system equations were solved and related codes were written to simulate the process. Simulation results were compared to those obtained from commercial software CMG. The results confirm a higher oil recovery in IWAG technique when compared to waterflooding and immiscible gas injection processes one by one.