Beggs and Robinson Oil Viscosity correlation

Brief

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

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:

$A = 10.715\ (5.615\ R_s + 100)^{-0.515})$

$B = 5.44\ ( 5.615\ R_s + 150)^{-0.338}$

Nomenclature

$A_0..A_{2}$ = coefficients

$B_0..B_{2}$ = coefficients

$C_0..C_{2}$ = coefficients

$P$ = pressure, MPA

$P_{bp}$ = bubble point pressure, MPA

$R_s$ = oil gas ration, m3/m3

$SG_g$ = gas specific gravity, dimensionless

$T$ = temperature, °R

$Y_{oil_API}$ = oil API gravity, dimensionless