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International Journal of Petroleum and Geoscience Engineering
IJPGE 2015, 3(1), 56-60
Investigation of Under-Saturated Oil Viscosity Correlations under Reservoir Condition; A Case Study on Libyan Crude Oil
Department of Petroleum Engineering, University of Tripoli Tripoli, Libya b National Oil Company Tripoli, Libya
ABSTRACT
Evaluation of under-saturated oil viscosity is one of the important factors in designing many oil field operations. Oil viscosity can be obtained in two methods, either by carrying out experimental measurements or estimated by a proper model. Viscosity usually reported in standard PVT analyses and its correlations can be categorized to either dead or live oil viscosity. Live oil viscosity correlations can be further classified to saturated (at bubble point pressure) or under-saturated (above bubble point pressure). The purpose of this study, testing the performance of the under-saturated oil viscosity correlations existed in the literature such as: Beal, Vasques and Begs, Labedi, Elsharkawy, and Khan and Ali for some Libyan oil samples under reservoir conditions. Statistical analysis is investigated to test the applicability of the models. Good agreements between the predicted and experimental values have been observed. Furthermore, the best evaluation of under-saturated oil viscosity was obtained by Beal correlation with an absolute average deviation percent (% AAD) of 19.95 %.