Mathematical Correlation Predicting Stock Tank Oil Density for Egyptian Crude Oils at Standard Conditions

Abstract

Liquid density is one of the most important governing physical parameter of the fluid flow. Generally, oil density measured at standard conditions (14.65 psia and 60 °F) via Density Meter. Since there is a remarkable difference between calculated density from compositional analysis and measured one at standard conditions. So it is of great importance to use an accurate correlation to calculate the oil density at standard conditions. The proposed correlation correlates measured density with measured molecular weight, calculated molecular weight and calculated density which calculated from compositional analysis. Here, based on measured Egyptian oil reservoirs data; new correlation has been developed for prediction of oil density at standard conditions (14.65 psia and 60 °F). Validity and accuracy of this correlation has been confirmed by comparing the obtained results of this correlation with experimental data for Egyptian oil samples. Checking the results of this correlation shows that the developed correlation results are in a high agreement with the experimental data.

PVT Properties of Black Crude Oil

“…The second one belongs to compositional models which rely on the equation of states and its hybrids. In these models besides PVT parameters, other measurements including fluid composition, critical temperature, molar masses and components acentric factor are utilized [12,13]. Although accuracy of the empirical PVT correlations is often limited due to variations and complexity of multicomponent reservoir fluid systems, these correlations still used on field scale [14][15][16][17].…”

Numerical Prediction of Oil Formation Volume Factor at Bubble Point for Black and Volatile Oil Reservoirs Using NonLinear Regression Models

“…where Bo= oil formation volume factor, bbl/STB, (Vo)P,T= volume of oil under pressure p and temperature T, and (Vo)sc= volume of oil is at standard conditions [5]. Although most PVT data determined experimentally in lab but, petroleum engineers may resort to empirical correlation due to; samples collected are not reliable, budget constraints, PVT analyses are not available when needed, quality check lab analysis, estimating the potential reserves to be found in an exploration prospects, and evaluating the original oil in place and reserve for a newly discovered area in addition to time saving as has been discussed by wood [6][7][8][9].…”

An Empirical Correlation for Estimation of Formation Volume Factor of Gas Condensate Reservoirs at Separator Conditions

“…where Bo= oil formation volume factor, bbl/STB, (Vo)P,T= volume of oil under separator pressure p andtemperature T, and (Vo)sc= volume of oil is at standard conditions [8]. Petroleum engineers may resort to empirical correlation in case of; non representative samples, PVT analyses are not available when needed [9], quality check lab analysis, estimating the potential reserves to be found in an exploration prospects, and evaluating the original oil in place and reserve for a newly discovered area [9][10][11]. Empirical correlations usually developed for regional geographical provinces with given chemical composition of reservoir fluid and data range [7,11].…”