Study on the displacement characteristics of flue gas complex thermal fluid

One of the component of flue gas is CO2 which can cause environment problem, and flue gas-assisted heavy oil thermal recovery can significantly improve the effect of heavy oil development. Therefore, research on features of flue gas composite hot fluid flooding are of great significance. This paper used one-dimensional core tube experiments to reveal the evolution of the temperature field and displacement zone during the development of flue gas composite thermal fluids. At the same time, it monitored the displacement pressure variation under different methods, and clarified displacement characteristics and oil displacement efficiency. The results show that with the injection of flue gas, the heat spread ranges of steam zone and hot water zone are expanded, and the heat utilization rate is improved. Oil flooding efficiency and maximum oil recovery rate of cold water/hot water-flue gas flooding efficiency is higher than that of cold water/hot water which at the same temperature, and the oil displacement efficiency and maximum oil recovery rate is improved. The hot water/hot water-flue gas flooding pressure variation and stable pressure variation are lower than cold water/cold water-flue gas flooding at the same temperature. Oil displacement efficiency of flue gas composite hot fluid flooding is obviously higher than pure steam flooding.