Difference between revisions of "Beggs and Robinson Oil Viscosity correlation"

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=== Application range ===  
 
=== Application range ===  
 
=== Nomenclature ===
 
=== Nomenclature ===
 +
:<math> A </math> = coefficient
 +
:<math> B </math> = coefficient
 +
 
:<math> P </math> = pressure, psia
 
:<math> P </math> = pressure, psia
 
:<math> P_{b} </math> = bubble point pressure, psia
 
:<math> P_{b} </math> = bubble point pressure, psia

Revision as of 10:08, 25 July 2017

Brief

Beggs - Robinson is an empirical correlation for the oil viscosity published in 1975 [1].

Math & Physics

Dead oil viscosity:

\mu_{od} = 10^X-1

where:

X = T^{-1.163} \times e^{(13.108-6.591/SG_{o})}

Saturated oil viscosity:

\mu_{os} = A \mu_{od}^B

where:

A = 10.715\ (R_s + 100)^{-0.515}
B = 5.44\ (R_s + 150)^{-0.338}

Undersaturated oil viscosity:

\mu_{o} = \mu_{os} (P/P_b)^m [2]

where:

m = 2.6\ P^{1.187}\ e^{(-11.513-8.98 \times 10^{-5}\ P)}

Discussion

Application range

Nomenclature

A = coefficient
B = coefficient
P = pressure, psia
P_{b} = bubble point pressure, psia
R_s = oil gas ration, scf/stb
SG_o = oil specific gravity, dimensionless
T = temperature, °F
/mu = viscosity, cP

References

  1. ↑ Beggs, H. D.; Robinson, J. R. (September 1975). "Estimating the Viscosity of Crude Oil Systems"Free registration required. Journal of Petroleum Technology. 27(09) (SPE-5434-PA). 
  2. ↑ Vazquez, M.; Beggs, H.D. (1980). "Correlations for Fluid Physical Property Prediction."Free registration required. Society of Petroleum Engineers (SPE-6719-PA). 
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