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:

B0 = 10.715
B1 = 5.615
B2 = 0.515

$\alpha1 = B_0 * (B_1 * R + 100)^B2)$

C0 = 5.44
C1 = 5.615
C2 = 0.338

$\alpha2 = C_0 * pow(C_1 * R + 150, -C_3)$

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