Environmental Engineering Reference
In-Depth Information
Note the rapid rise of the oil-water contact(s) with passage of time. It is simple
to calculate changes in
S
w
. Consider the state of affairs at time
t
1
:
(
)
(
)
-
SS fS S
-
-
1
ma
hy
ma
S
w
=
(
)
1
fS S
-
w
hy
and some time later at time
t
2
:
(
)
(
)
-
SS fS S
-
-
2
ma
hy
ma
S
w
=
(
)
2
fS S
-
w
hy
The change is
S
w
is, therefore,
(
)
SS
fS S
-
DS
fDS
1
2
D
SSS
w
=-=
)
=
(
w
1
w
2
-
w
hy
fluids
Log-Inject-Log
The log-inject-log technique is used to find residual oil saturations. A base log is run
and then the formation is injected with brine and logged again. Finally, the forma-
tion is injected with fresh water and logged a third time (see Fig.
11.31
).
Fig. 11.31
Log-inject-log
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