Study Of Reservior Numerical Simulation For Enhanced Recovery By Air-foam Injection

The air and air-foam injection flooding was a very valuable and perspective methodology of enhanced oil recovery for light oil reservoir and got more and more attention for the advantage of abundant air source and low cost. The main principle was that at the reservoir temperature the oil consumed the oxygen with the oxidation reaction spontaneously and the generated flue gas gradually achieved flue-gas drive; Also the foam reduced the gas phase mobility and improved the sweep efficiency ,so as to achieve the purpose of enhanced oil recovery.The low-temperature oxidation air injection math model was established effectively on the basis of literature investigation which provided the strong theoretical foundation for reservoir numerical simulation. Then combined with the component model, fluid PVT model, foam characteristic model and the geological model, the air-foam driving numerical model was finally established which provided the basic theory for the air-foam simulation.Then the geological and dynamic model of Hu 12 block, Zhongyuan Oil Field were built and according to the history matching, on this basis, analyzing the effection of gas injection ratio, foam liquid injection rate, foam liquid concentration,slug period and gas-liquid ratio on final recovery,providing reference for field production dynamic data.In order to prevent the pollution of output gas, how to tackle and limit the produced gas as well as made use of the gas was studied. With the conceptual model the main factors influenced the breakthrough time and output components of air injection flooding were analyzed and in this base the effective plan was proposed. At last according to produced oxygen percentage in gas phase and the security of this technology were researched.