Optimized design of enhanced foam flooding parameters after polymer flooding

In order to further improve the recovery of oil reservoirs after polymer flooding,according to the reservoir characteristics of enhanced foam flooding in the pilot test area and the development status at present,by using CMG numerical simulation software,the optimized design of enhanced foam flooding parameters was carried out,namely the injected slug size,the injection concentration,injection pattern and etc.,and therefore,the development plan was established.The optimized results indicate the enhanced foam system is 2000 mg/L stabilized foam agent +0.3%foaming agent,the reasonable gas-liquid ratio is 1:1 and the best injection is of 0.5 PV,and the oil displacement effect of gas-liquid mixing injection way is the best.It is predicted the recovery efficiency can be improved by 10% after implementation and it is feasible to further improve the recovery through enhanced foam flooding after polymer flooding.