Abstract :
Water injection is one of the EOR methods which has shown great potential in recent years. The water flooding process is more effective when the injected water is enriched by chemicals which improves the oil recovery by reducing interfacial tension )IFT( and alternating wettability. In this work four long alkyl chain imidazolium based ionic liquids )ILs( including Octyl, Decyl, Dodecyl, and Tetradecyl methylimidazolium Chloride were synthesized and characterized by 1HNMR and elemental analysis. Furthermore, some physicochemical properties were investigated for studied ILs as a function of temperature. The synthesized ILs were examined as additives in injected water to reduce the IFT in water flooding process. The critical micelle concentration )CMC( point and IFT of enriched sea water by ILs/crude oil were measured as a function of ILs concentration. The results show that ILs can be good candidates for EOR technology due to their significant behavior in IFT reduction and their low consumption. According to obtained results, as the alkyl chain was longer, the CMC point and IFT values were lower. ]C14mim]]Cl] was the most effective ILs which 50 ppm of this ILs, reduced the IFT values to 0.65 mN.m-1.
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