CHARACTERIZATION OF HEAVY OILS .3. PREDICTION OF GAS INJECTION BEHAVIOR - SWELLING TEST, MULTICONTACT TEST, MULTIPLE-CONTACT MINIMUM MISCIBILITY PRESSURE, AND MULTIPLE-CONTACT MINIMUM MISCIBILITY ENRICHMENT

The modeling of miscible gas injection into reservoir crude oils was p erformed using a cubic equation of state coupled with a predictive pro cedure for characterizing the heavy fractions. It is shown that experi mental data on the swelling test, multicontact test, slim tube minimum miscibility pressure (MMP), and minimum miscibility enrichment (MME) for 10 different crude oils from different fields are satisfactorily c alculated using the predictive characterization. However, in the case of MMP and MME calculations, a significant deviation may appear betwee n predicted and experimental values. Reasons for this discrepancy are discussed. The influence of tuning the equation of state parameters in the estimation of results for the swelling test is also discussed.