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04_Black oil properties_correlations

04_Black oil properties_correlations - Black-Oil Properties...

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Unformatted text preview: Black-Oil Properties – Correlations 1 Black-Oil Properties – Correlations Instructional Objectives: - Use black-oil correlations to estimate black-oil properties ( p b , R s , B o , ρ o , c o ). - List the variables required to use oil property correlations. - Show how to obtain estimates of p b and R sb from field data. - Use a correlation to estimate the specific gravity of the gas leaving solution in the oil in the reservoir. Summary of Black-Oil PVT Correlations: Black-Oil Properties – Correlations ( p = p b ): ( ) T API R f p o gSP sb b , , , γ = ( ) T p API R f b o gSP sb ob , , , , γ ρ = ob gSP sb STO ob R B ρ γ ρ 01357 . + = (not a correlation) ( ) T API R f o sb ob , , = μ Black-Oil Properties – Correlations ( p > p b ): sb s R R = (not a correlation) ( ) T p API R f c o gSP sb o , , , , γ = ( ) [ ] p p c EXP B B b o ob o − = (not a correlation) ( ) [ ] b o ob o p p c EXP − = ρ ρ (not a correlation) ( ) T p p API R f b o sb o , , , , = μ Black-Oil Properties – Correlations ( p < p b ): ( ) T p p API R f R b o gSP sb s , , , , , γ = ( ) T p API R f o gSP sb o , , , , γ ρ = o gSP s STO o R B ρ γ ρ 01357 . + = (not a correlation) ( ) T p API R f o s o , , , = μ ( ) T p p API R f c b o gSP sb o , , , , , γ = Black-Oil Properties – Correlations 2 Bubble-Point Correlation: [ ] 354891 . 5 161488 . 081465 . 740152 . 10 47 . 1091 − = − X gs sb b R p γ Where, ( ) ( ) 176124 . 2 6 282372 . 10 2 . 8 013098 . API x T X γ − − = T is reservoir temperature in o F, R s is solution gas/oil ratio in scf/STB, and p b is bubble-point pressure in psia. R s should include separator gas and stock-tank gas. The results are accurate to within 15 percent for temperatures to 320 o F. Another graphical correlation (less accurate) that can be used for determining the bubble-point pressure, p b , or solution gas oil ratio, R s is given by the following figure. Solution Gas-Oil Ratio: The solution gas-oil ratio for pressures above the bubble-point pressure is the same as the solution gas-oil ratio at the bubble-point pressure, R sb . For pressures at and below the bubble- point pressure, solution gas-oil ratio, R s , can be obtained from the above figure. Another correlation (more accurate) is given below: ( ) 3 2 1 1 1 a r a r sr p a p a R − + = Where, b r p p p = , sb s sr R R R = And, Black-Oil Properties – Correlations 3 4 3 2 1 1 A b A A API A gSP p T A a γ γ = 4 3 2 1 2 B b B B API B gSP p T B a γ γ = 4 3 2 1 3 C b C C API C gSP p T C a γ γ = Reservoir Liquid Density: For pressures above the bubble-point pressure, the following equation is used to calculate the density of the reservoir liquid: ( ) [ ] b o ob o p p c EXP − = ρ ρ The correlation below is used to calculate the reservoir liquid density of black-oils for pressures at and below the bubble-point pressure. The pressure and R s are replaced with the bubble-point pressure and R sb for calculations at the bubble-point pressure....
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04_Black oil properties_correlations - Black-Oil Properties...

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