Procurement, construction, and installation of unconsolidated sand packs and equipment for displacement studies up to 5000 psi is complete and the equipment is in routine use. One accomplishment was sampling equipment for taking samples at pressures up to 8000 psi during displacement and phase behavior studies. 21 displacements have been made using synthetic crudes. Results suggest that miscibility can be generated between pure CO/sub 2/ and this oil at 1100 psig. At a displacement temperature of 109/sup 0/F, miscibility is generated through multiple contacts and the data suggest that the generation mechanism is one of condensation rather than vaporization. In displacements in which the injection gas was a CO/sub 2/-CH/sub 4/ mixture, the minimum miscibility pressure appears to increase approximately linearly with increasing methane content. Increased CH/sub 4/ concentrations over those originally present were observed in all displacements where the pressure was less than that required for first contact miscibility. Thus it was tentatively concluded that the presence of a bank is not in itself an indication that miscibility was not attained, but only an indication that the mechanism was one of generation of miscibility through mass transfer (multiple contacts).