Environmental Engineering Reference
In-Depth Information
Question #3.12
C
o
and
k
a. If ˁ
ob
= 0.745,
ind
C
o
= ___
b. If
p
wf
/
p
b
= 0.375,
ind
k
= ___
Question #3.13
B
o
Using the answers from Question 3.12, find
B
o
for the following conditions:
a. Undersaturated oil, where
B
ob
= 1.44,
p
b
= 3,800, and
p
wf
= 4,800
∴
B
o
= ____
b. Saturated oil, where
B
ob
= 1.44, and
p
wf
/
p
b
= 0.375
∴
B
o
= ____
Oil Density
. Oil density at well flowing conditions is another vital piece of data for
interpretation of gradiomanometer surveys. It is a function of
ʳ
g
,
R
s
,
B
o
, and
ʳ
o
.
Figure
3.21
combines all the appropriate data on one chart and gives
ˁ
owf
as a result.
Oil density at well flowing conditions (
ˁ
owf
) may be estimated using the chart by
following an example calculation. If the inputs given are:
ʳ
o
= 30° API,
ʳ
g
= 0.75,
R
s
= 350 cf/B,
B
o
= 1.21
1. Locate Point
a
by a line from
ʳ
g
= 0.75 through
R
s
= 350
2. Locate Point
b
by a line from Point
a
to
ʳ
o
= 30° API
3. Draw a line from Point
b
through
B
o
= 1.21 and read
ˁ
owf
= 0.77 g/cm
3
ˁ
owf
may also be calculated directly using the equation:
141 5
131 5
.
)
+
0 0002178
.
´
g
´
R
(
g
s
.
+
g
o
r
=
owf
B
o
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