Gas injection process as both a pressure maintenance method & an IOR method has a long background in the upstream. Adding foam is a proven method for decreasing gas mobility in both homogeneous and heterogeneous reservoirs. Foamed gas, though is a promising agent for achieving mobility control in porous media. Its profound impact on the efficiency of different gas injection applications fascinated the industry on considering using it to supply the future needs of the world to hydrocarbons.
The idea here is to inject CO2 which is immiscible at the start of injection along with a kind of foamer solution. The role of foam is to increase the contact area of the reservoir by reducing the gas mobility leading to higher volumetric sweep efficiency and mitigating the so-called effect of gravity override. The process is completed by injecting gas to the amount that it becomes miscible. (Reservoir pressure goes beyond MMP). No production is expected after the initial injection to the time we are certain that the whole system is in thermodynamic equilibrium. The in depth theoretical description is included.
The simulation of the process is performed using a coded isothermal compositional simulator together with commercial reservoir simulation soft-wares, though simulation models and simulation tools that accurately gauge the effects of foam on gas mobility in porous media are not readily available.
The simulation results are compared with the experimental results. Feasibility study is performed and the setbacks of the process are analyzed. Some remedies are offered to improve the process.