Study on Enhanced Oil Recovery Mechanism of CO(2) Miscible Flooding in Heterogeneous Reservoirs under Different Injection Methods

[Image: see text] The mechanism by which oil recovery can be enhanced by different injection methods of CO(2) miscible flooding to alleviate the influence of heterogeneous reservoirs was studied to optimize the injection methods, further improving oil recovery. According to the reservoir heterogeneity characteristics of the TI oil formation group in Lunnan Oilfield, a 1 m double-layer long core was designed and prepared for four CO(2) miscible displacement experiments with different injection methods. By analyzing the variation in the injection-production parameters, the displacement effects of different injection methods were compared, and the mechanism of enhanced oil recovery (EOR) was summarized. The results indicate the following. ① The displacement efficiency of the different injection methods lies in the following order. Alternate CO(2)–water injection, continuous CO(2) flooding, cyclic CO(2) flooding, and alternate CO(2)–hydrocarbon gas injection. ② The recovery of crude oil via CO(2) miscible flooding in heterogeneous reservoirs relies on both convective diffusion and miscible mass transfer. Convective diffusion depends mainly on control of the displacement pressure differential and the plugging of preferential seepage channels in high-permeability areas, while miscible mass transfer depends mainly on the swept range of the convective diffusion and the degree of miscibility between CO(2) and crude oil. ③ To improve the recovery efficiency of CO(2) miscible flooding in heterogeneous reservoirs, it is necessary to choose an injection method that optimizes these two aspects.