Experimental Investigation of Adsorption Phenomenon in Surfactant Alternative Nitrogen Injection

Document Type : Research Note

Authors

1 Research Institute of Petroleum Industry (RIPI), Tehran, I.R. IRAN

2 Sahand Oil and Gas Research Institute, Sahand University of Technology, Tabriz, I.R. IRAN

Abstract

Due to decline in oil production, inefficiency of  conventional EOR methods and a huge trapped volume of oil in reservoirs, it is reasonable to use helpful methods with higher initial cost. Adsorption phenomenon that has been affected by several factors, weakens the success of SAG injection which its efficiency is confirmed by fractional flow analysis. In this study,by conducting static and dynamic adsorption experiments, the effects of sacrificial agent, gas phase, and surfactant concentration on adsorption density were examined. Next, SAG experiments were performed in order to compare with the conventional methods such as water alternative gas injection and continuous gas injection. Also, the effect of sacrificial agent on oil recovery was studied. Spectrophotometric method based on the formation of an ion-pair between Safranin o and surfactant was used in all experiments for determination of surfactant concentration. The results of adsorption experiments show that SDS adsorption density was reduced when nitrogen was imposed instead of using methane. Also, the amount of surfactant loss was decreased in precense sacrificial agent. Static experiment shows that the amount of loss of surfactant on dolomite and shale were higher than Silica. Flooding experiment results show that SAG injection increase final recovery up to 10% and 28% in comparison with WAG and continuous gas injection, respectively. formation of stable foam in optimum injection rate leads to decrease in gas mobility. Using CLS slightly increases the ultimate oil recovery up to 2 %, while it decreases the loss of SDS 22 percent.

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References

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