McCain Oil Formation Volume Factor equation

McCain Oil Formation Volume Factor equation

McCain equation is an material balance equation 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

$B_o$ = oil formation volume factor, rm³/sm³

$R_s$ = solution gas-oil ratio, sm³/sm³

$SG_g$ = gas specific gravity, dimensionless

$\rho_{oR}$ = oil density at reservoir conditions, kg/m³

$\rho_{STO}$ = stock tank oil density, kg/m³

Subscripts

b - bubble point

g - gas

o - oil