Danial Farokhian - Department of Petroleum Engineering, Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, Bushehr, Iran
Zohreh Farmani - Department of Petroleum Engineering, Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, Bushehr, Iran
Reza Azin - Department of Petroleum Engineering, Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, Bushehr, Iran
Mohammad Mallahi - Department of Reservoir Engineering, South Zagros Oil and Gas Production Company, Shiraz, Iran
Manouchehr Vallizadeh - Department of Reservoir Engineering, South Zagros Oil and Gas Production Company, Shiraz, Iran

To meet the global rising energy demand, the oil and gas industry is challenged to maximize oil recovery from the existing hydrocarbon reservoirs. In this study, sand pack experiments are conducted to investigate the effect of different parameters such as rock type, gas flow rate and oil type on oil recovery factor. Dental CT-scan images are taken to show the internal structure of the carbonate core and also EDX anlaysis is performed to admit carbonation of the core. It can be concluded that the oil RF for sand is much higher than carbonate due to the porosity and permeability and shape of the pores. The quadratic model is fitted better for carbonate samples and it gives a higher R-squared value of 0.9402 for test#2. the gas flow rate has very little effect on the sand. Finally, the maximum oil RF for sand is 74.04% and for carbonates, is 47.85%.

Oil recovery factor, Rock type, Gas flow rate, Oil type, CT-scan, EDX