Page 384 - Petrophysics 2E

352 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

TABLE 5.4
SATURATION PROFILE

Swj Ji
1 .oo 0.090 3.179 0.41
0.80 0.140 4.973 0.64
0.70 0.170 6.039 0.77
0.60 0.235 8.348 1.07
0.50 0.350 12.434 1.59
0.40 0.560 19.894 2.55
0.35 0.700 24.867 3.18
0.30 0.950 33.749 4.32
0.20 1.650 58.616 7.50

Height above the free water level was calculated from:

0.102 Pc
h(m) = = 0.128Pc
0.8

The oil-water contact (OWC) occurs at the threshold pressure where
S, = 1.00; therefore:
OWC = 0.41 m above the FWL
Height above the FWL at So, occurs at S, = 0.70 = 0.77m.
Height above the FWL. at Si, = 7.50 m.

CAPILLARY NUMBER

The capillary number is a dimensionless group that represents the
ratio of viscous forces to the interfacial forces affecting the flow of fluid
in porous media. Applied to water displacement of oil, the capillary
number is:

where p, uw, and d are expressed, respectively, in poises (or kg/m x s),
m/s, and N/m (kg x m/s2 x m).
In practice, the viscosity is expressed as centipoise, the velocity as
m/day and the interfacial tension as N x 10-3/m; therefore: