Page 428 - Petrophysics

396 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

TABLE 6.4
EFFECT OF TEMPERATURE THE USBM WEllABlLlTY INDEX. THE TESTS WERE
ON
CONDUCTED USING SEPARATE CORES OF THE DESIGNATED OUTCROP
(AFTER LORENZ ET AL. psi)

Average Average
I, at 25°C I, at 65°C
Core Crude Oil No. of No. of
Samples Samples I, samples I, samples
Cottage Grove
sandstone Bartlesville, OK -0.16 3 0.13 3
Cottage Grove
sandstone Muddy J, CO -0.39 3 -0.03 3
Cottage Grove
sandstone Singleton, NB -0.32 3 0.2 1 3
Torpedo
sandstone Squirrel, OK 0.00 6 0.35 18
Torpedo
sandstone Squirrel, OK 0.09 2 0.22 6

1.0 I
BEREASANDSMNE

s
r xo.5- \\
X
c
d 0- 25 'C
m
2
W
I-
P -0.5-
-1.0 I I I I I I I
0 1 2 3 4 5 8 7 8

Jadhunandan and Morrow examined the effects of variations of aging
with temperature and time and established approximately 240 hours of
aging to obtain stable wettability conditions [ 1 151. Waterfloods following
the aging periods resulted in greater oil recovery at neutral wettability
systems.