The polymer-enhanced foam injection process: An improved-oil- recovery technique for light oil reservoirs after polymer flooding

Using the methods of physical simulation and numerical simulation, the feasibility of polymer-enhanced foam injection after polymer flooding is studied. First, an experiment-based screening criteria for polymer-enhanced foams is presented, and the influence of polymer concentration on foam mobility is investigated. Thereafter, the parallel experiments of polymer-enhanced foam injection and conventional foam injection after polymer flooding are performed. A Lorentz–Monte-Carlo method is then proposed to establish the heterogeneous geological models with different interlayer and plane heterogeneity. Thus, the sensitivity of reservoir heterogeneities on oil recovery of enhanced foam injection is analyzed numerically, and the implementation plan is optimized.