McCain Oil Formation Volume Factor equation

McCain Oil Formation Volume Factor correlation

McCain correlation is an empirical correlation for the oil formation volume factor published in 1990 .

McCain Oil Formation Volume Factor correlation in the PVT Software

Math & Physics

$B_o = \frac{\rho_{STO}+1.22117R_s\gamma_g}{\rho_{oR}}$

Example. Calculation of the oil density

Example source

Input data

$R_s$ = 53.24 sm3/sm3

$SG_o$ = 0.85 or 35 API

$SG_g$ = 0.75

$T$ = 90C or 363K

$P$ = 10 MPa

Calculate oil density at p = 10 MPa?

Solution

$\rho_o$ = 749.645 kg/m3

The solution is available in the online PVT calculator software model at www.pengtools.com

Application range

Description of the Data Used:

$133 \le P_b \le 6,700$

$77 \le T \le 327$

$18 \le R_{sb} \le 1,975$

$0.76 \le SG_o \le 0.95$

$0.556 \le SG_g \le 1.237$

$31.3 \le \rho_{ob} \le 55.77$

Number of data sets = 684

Nomenclature

$c_o$ = oil compressibility, 1/psia

$P$ = pressure, psia

$R_s$ = solution gas-oil ratio, scf/stb

$SG_g$ = gas specific gravity, dimensionless

$SG_{gSP}$ = gas specific gravity at separator pressure, dimensionless

$SG_o$ = oil specific gravity, dimensionless

$T$ = temperature, °F

$\rho_{a}$ = apparent density of surface gas if it were a liquid, lb_m/ft³

$\rho_{ob}$ = liquid density at the bubble point pressure, lb_m/ft³

$\rho_{bs}$ = liquid density at reservoir pressure and 60°F, lb_m/ft³

$\rho_o$ = oil density, lb_m/ft³

$\rho_{po}$ = pseudoliquid formed by recombination of surface gas and liquid at standard conditions, lb_m/ft³

$\triangle \rho_{P}$ = adjustment to liquid density due to pressure, lb_m/ft³

$\triangle \rho_{T}$ = adjustment to liquid density due to temperature, lb_m/ft³

Subscripts

b - bubble point

g - gas

o - oil