Study on Hot Air Miscible Flooding Technology in C46 Reservoir in Ordos Basin

The low permeability reservoir in Jiyuan area of Ordos basin is rich in resources, but the reservoir pore structure is complex, the water injection pressure is high, the underinjection is frequent, and the pressure level is low, with an average of 70%. Therefore, the pilot test of air-thermal miscible flooding in C46 reservoir is of great significance to realize long-term stable production and improve ultimate oil recovery of ultra-low permeability reservoir in Changqing oilfield. Taking Y08-28 well group of C46 reservoir as an example, the development effect of 2 gas injection and 7 production is adopted in numerical simulation, and the key technical parameters such as daily gas injection in the process of gas injection are determined. The results show that hot air miscible flooding can effectively improve the degree of recovery compared with conventional water flooding.