How CO2 Flooding Improves Oil Recovery

The way CO2 moves through oil reservoirs is key to boosting oil recovery and storing CO2. This process, known as immiscible CO2 flooding, is simple and cost-effective. But, there is a lack of understanding of how it behaves at the tiny pore scale, especially when temperature and pressure change together. This is where the research comes in. A special setup was used to mimic real-world conditions. It allowed scientists to watch how CO2 and water move through tiny pores under varying pressures and temperatures. They measured how fast the CO2 was injected, the pressure needed to push it through, and how much oil was left behind. The findings showed that after water flooding, there was more oil left in clusters. But, when CO2 was used, it broke up these clusters and improved oil recovery. The study also found that higher pressures and faster injection rates made a big difference. Higher pressures stopped the CO2 from flowing too fast, which made the oil recovery process more efficient. Faster injection rates and higher pressures both led to better oil recovery. The exact improvements were 12. 9%, 24. 9%, and 6. 1% respectively.Understanding these details can help in designing better oil recovery methods. It shows that tweaking the pressure and injection rate can make a big difference in how much oil is recovered. This is important because it means that with the right conditions, CO2 flooding can be a very effective way to get more oil out of the ground. It also highlights the need for more research into how these conditions affect the process. The results of this study are important because they provide a deeper understanding of how CO2 flooding works. This knowledge can be used to improve oil recovery methods and make them more efficient. It also shows that there is still a lot to learn about how CO2 behaves in oil reservoirs, especially under changing conditions. This is an area where more research is needed.