EFFECTS OF `IMPURITIES` ON MINIMUM MISCIBILITY PRESSURES AND MINIMUM ENRICHMENT LEVELS FOR CO2 AND RICH GAS DISPLACEMENTS.

This study presents results of studies using mixtures of CO//2, H//2S and C//1, CO//2-LPG, and rich gas solvents containing CO//2 or C//5 to miscibly displace oil in slim tube experiments. The purpose of this work is to show the effects of various components on pressure and compositions required for miscibility. As expected, the changes in CO//2 miscibility pressure are direct functions of temperature. The study also presents similar results from displacements using typical rich gas solvents mixed with CO//2 and/or C//5. It is reported that CO//2 increases the minimum enrichment required while a heavier hydrocarbon component can actually reduce anticipated enrichment levels.