Abstarct: Abstract The initial pressure of a hydrocarbon tank is enough to produce only a small fraction of its oil. A common way to prevent a decrease in oil production is to inject water, gas, or other fluids into the tank to maintain its pressure and displace its fluid. However, the effectiveness of this method has remained limited for various reasons, including the viscous fingering phenomenon. One of the new ways to solve this challenge is to use foam. Injection of foam causes uniform displacement and prevents the occurrence of viscous fingering phenomenon, but maintaining its stability in the oil phase is a major challenge in the processes of enhanced oil recovery. Considering the importance of foam life in the process of oil displacement, in this study, the factors affecting the foam’s stability have been investigated. By constructing different laboratory setups, the effect of changing the specifications of the surfactant and the oil phase on foam stability in both the bulk scale and the bubble has been explored. In addition, the foam front during fluid displacement (water and oil) and the dynamic stability of foam in contact with the oil phase has been investigated quantitatively and qualitatively and its efficiency in controlling the phenomenon viscose fingering is discussed. Foam stability has been studied in the bulk scale experiments by measuring the height change of foams within the chromatographic column. These experiments on the bubble scale and studies of its movement front during fluid displacement were performed within the Hele-shaw cell. The changes in the foam and its bubbles have been studied quantitatively and qualitatively by processing images captured by a camera. The results showed that the surfactant type had a significant effect on foam stability. First, the SDS and CAPB has better stability in the presence and absence of oil respectively. However, by combination of 1:1 SDS and CAPB, the foam stability has been improved significantly. The half-life time of new foam (CAPBSDS) Comparing to CAPB foam was increased in the absence of oil at the bulk and the bubble scales respectively by 33% and 122%. However, the stability of all the foams in the presence of the oil phase decreased, but CAPBSDS showed the best resistant and improve half life time comparing to SDS by 71% at the bulk scale. In addition, by comparing the obtained experimental results with the classical theory, inability of the theory in predicting the value and order of the foams stability has been observed. In water-saturated recovery experiments, the use of foam compared to pure gas injection (air) improves the displacement front and prevents the occurrence of viscose fingering, which increases the sweeping efficiency by about 30%. But the results of the oil phase recovery tests prove its destructive effect on the formation of a stable foam front. Despite the extreme instability of the foam bubbles when in contact with the oil phases, this method is able to recover all of the oils in contrast to the gas injection method. Also, the obvious difference between the two methods is that in the foam injection method, the efficiency of the oil recovery increases with increasing the viscosity ratio of fluids. Although the increase in viscosity ratio aggravates viscous fingering instability, the stability of the displacement front and its recovery efficiency improves due to the decrease in destructive effects of the oil phase on the stability of the foam at higher oil viscosities. The results of this study show that the usage of foam noticeably improves the efficiency of enhanced oil recovery. But this method’s success depends significantly on the surfactant stability and the types of oils. With increasing the viscosity of the oil phase, its productivity would increase.