Gas is very efficient for displacing oil in enhanced-oil-recovery projects because of its high microscopic-displacement efficiency. However, the process at the reservoir scale suffers from poor sweep efficiency due to lower density and lower viscosity compared to in-situ fluids. Foam substantially reduces the mobility of injected gas and hence improves the sweep. Foam rheology in 3D geological porous media has been characterized both theoretically and experimentally. In contrast, the knowledge of foam flow in fractured porous media is far less complete. Due to the gas diffusion between bubbles, foam structure will be evolved over time. There is a good understanding of coarsening behavior in a bulk foam; however, coarsening in confined geometries such as porous media is not well defined.