https://doi.org/10.36719/1726-4685/94/157-176 SOLUBLIZATION PARAMETERS AND PHASE BEHAVIOR OF ECO FRIENDLY SURFACTANTS-BRINE- OIL MICROEMULSION FOR ENHANCED OIL RECOVERY

The phase behavior of surfactant-brine-oil system is important key in evaluating the oil recovery by micro emulsion system. The used surfactants in this study were named as ethoxylated dodecylbenzene sulfonate, ethoxylated hydrolyzed jatropha and isopropanol as a co surfactants. The behavior of nonionic surfactants derived from Jatropha oil were studied to investigate their using in micro emulsion system at different salinities (50.000, 100.000 and 200.000 ppm) and temperatures (50, 70 degrees C). The solublization parameters and relative phase volume also were studied to determine the optimal solublization parameters and optimal salinity. The dynamic interfacial tension and contact angle were measured at the optimal salinity. The interfacial tension was found to be lower between oil and micro emulsion. The sand pack flooding by using surfactant system predicted the performance of micro emulsion in oil recovery by surfactant individually and its blends. It was found that the recovery percent at optimal salinity (100.000 ppm) reached to 22.57% at 70 degrees C, 53.38% at 50 degrees C by EHJ23 and 26.21 % by EHJ23+EABS14 +CO from the residual oil in the reservoir and the total recovery (cumulative oil produced %) for obvious materials are 59.7%, 74.16% and 77.4%, respectively. These results give indication that, the using of these surfactants is promising in enhanced oil recovery field