Difference between revisions of "McCain Oil density correlation"
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=== Nomenclature === | === Nomenclature === | ||
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:<math> c_o </math> = oil compressibility, 1/psia | :<math> c_o </math> = oil compressibility, 1/psia | ||
:<math> P </math> = pressure, psia | :<math> P </math> = pressure, psia | ||
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:<math> SG_o </math> = oil specific gravity, dimensionless | :<math> SG_o </math> = oil specific gravity, dimensionless | ||
:<math> T </math> = temperature, °F | :<math> T </math> = temperature, °F | ||
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| + | :<math> \rho_{a} </math> = apparent density of surface gas if it were a liquid, lb<sub>m</sub>/bbl | ||
| + | :<math> \rho_{bs} </math> = liquid density at reservoir pressure and 60°F, lb<sub>m</sub>/bbl | ||
:<math> \rho_o </math> = oil density, lb<sub>m</sub>/bbl | :<math> \rho_o </math> = oil density, lb<sub>m</sub>/bbl | ||
:<math> \rho_{po} </math> = pseudoliquid formed by recombination of surface gas and liquid at standard conditions, lb<sub>m</sub>/bbl | :<math> \rho_{po} </math> = pseudoliquid formed by recombination of surface gas and liquid at standard conditions, lb<sub>m</sub>/bbl | ||
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:<math> \triangle \rho_{P} </math> = adjustment to liquid density due to pressure, lb<sub>m</sub>/bbl | :<math> \triangle \rho_{P} </math> = adjustment to liquid density due to pressure, lb<sub>m</sub>/bbl | ||
:<math> \triangle \rho_{T} </math> = adjustment to liquid density due to temperature, lb<sub>m</sub>/bbl | :<math> \triangle \rho_{T} </math> = adjustment to liquid density due to temperature, lb<sub>m</sub>/bbl | ||
Revision as of 13:50, 26 July 2017
Contents
Brief
McCain is an empirical correlation for the oil density published in 1995 [1].
Math & Physics
Pseudoliquid density:
Apparent liquid density:
Next pseudoliquid density:
Iterate until pseudoliquid densities are equal.
Adjust density to the pressure of interest:
where
Adjust density to the temperature of interest:
where
Adjust density above the bubble point pressure:
Discussion
Application range
Description of the Data Used[1]:
Number of data sets = 684
Nomenclature
= oil compressibility, 1/psia
= pressure, psia
= solution gas-oil ratio, scf/stb
= gas specific gravity, dimensionless
= oil specific gravity, dimensionless
= temperature, °F
= apparent density of surface gas if it were a liquid, lbm/bbl
= liquid density at reservoir pressure and 60°F, lbm/bbl
= oil density, lbm/bbl
= pseudoliquid formed by recombination of surface gas and liquid at standard conditions, lbm/bbl
= adjustment to liquid density due to pressure, lbm/bbl
= adjustment to liquid density due to temperature, lbm/bbl
Subscripts
- b - bubble point
- od - dead oil
- os - saturated oil
- o - undersaturated oil
References
- ↑ 1.0 1.1 McCain, W.D. Jr.; Hill, N. C. (1995). "Correlations for Liquid Densities and Evolved Gas Specific Gravities for Black Oils During Pressure Depletion"
. Society of Petroleum Engineers (SPE-30773-MS).
- ↑ McCain, W.D. Jr. (1990). Properties of Petroleum Fluids (2 ed.). Oklahoma: PennWell Corp. ISBN 978-0878143351.
