Investigation of Polymer-Assisted CO2 Flooding to Enhance Oil Recovery in Low-Permeability Reservoirs

CO2 flooding is a favorable technical means for the efficient development of low-permeability reservoirs, and it can also contribute to realization net-zero emissions. However, due unfavorable viscosity ratio gravity overriding effect, channeling will inevitably occur, seriously affecting its storage displacement effects. This paper conducts systematic study on application polymer-assisted in reservoirs. Firstly, polymer agent suitable reservoirs optimized through viscosity-increasing, rheological, temperature- salt-resistant properties solution. Then, injectivity performance, resistance-increasing ability, profile-improving effect solution were evaluated core experiments, optimum concentration was optimized. Finally, enhanced oil recovery (EOR) effects water-assisted compared. The results show that temperature-resistant surfactant (TRPS) has certain viscosity-increasing good temperature resistance react with increase significantly. Meanwhile, TRPS injection performance effect. increasing factor (η η′) TRPS-assisted increases increased permeability, solution, rounds. Considering η′ profile improvement comprehensively, should be 1000 mg/L. EOR 8.21% higher than flooding. main effective period first second rounds, best round three. research content this provide data support field