Application of CO_2-EOR in the deep low permeability reservoir——by taking Hu 96 block of Zhongyuan oilfield as an example

In view of technical difficulties in development of deep low permeability reservoirs, by taking Hu 96 block of Zhongyuan oilfield as the target reservoir, a technical system of EOR by CO_2 flooding in deep low permeability reservoirs has been innovated by combining indoor experiments with numerical simulation, and the influence of the formation pressure and hydrocarbon components on the minimum miscible pressure has been studied. It is realized continuous CO_2 flooding can be achieved under original formation condition after gas injection to restore pressure, and the optimal injection and production parameters of CO_2 flooding in deep high pressure and low permeability reservoirs are optimized. The field application has achieved good results, achieved a big increase in oil recovery, and enriched and developed the field development technology.