Mehdi Foroozanfar - Department Of Chemical Engineering , University of Tehran , Kish International Campus, Iran

Microscopic displacement efficiency is largely a function of interfacial forces acting between the oil, rock, and displacing fluid . If the interfacial tension between the trapped oil and the displacing fluid could be lower , the oil droplets could be deformed and could squeeze through the pore constrictions . A miscible process is one in which the interfacial tension is zero; that is, the displacing fluid and the residual oil mix to form one phase. If the interfacial tension is zero, then the capillary number Nc becomes infinite and the microscopic displacement efficiency is maximized . In this article have been investigated the effect of some parameters such as reservoir pressure , miscible gas density , oil density , initial water saturation and gas density on miscible flooding .

Microscopic displacement , Interfacial force , Capillary number