Environmental Engineering Reference
In-Depth Information
An example of how to use Fig.
3.18
in order to find
P
b
will use the following
given starting points:
T
Twf
= 180 °F,
q
osc
= 600 B/D,
q
gac
= 240 Mcf/D, ʳ
g
= 0.75 and
ʳ
o
= 40° API.
240 000
600
,
cf D
BD
/
1.
R
=
=
400
cf B
/
/
2.
R
sb
=
R
, since the field-usage definition of
P
b
stipulates given flow rates of oil and
gas, taken here to be
q
osc
and
q
gac
(above)
3. On the nomograph, locate Point
a
by a line through
T
Twf
= 180 °F and
R
sb
= 400
4. Locate Point
b
by a line through ʳ
g
= 0.75 and ʳ
o
= 40° API
5. Connect
a
and
b
to read
P
b
= 1,560 psia
Question #3.10
p
b
Given: ʳ
g
= 0.7, ʳ
o
= 40° API,
T
Twf
= 200 °F,
R
sb
= 1,000 cf/B
Find
p
b
= ___psi
Oil Formation Volume Factor
By definition,
B
o
=
V
owf
/
V
osc
or
B
o
=
q
owf
/
q
osc
. The oil formation volume factor is a
function of ʳ
g
,
R
sb
, and
T
. Its value at the bubble-point pressure can be estimated
from Fig.
3.19
.
By way of example the value of the oil formation volume factor at the bubble-
point pressure
B
ob
may be estimated from the given starting parameters:
R
sb
= 400 cf/B,
T
Twf
= 180 °F, ʳ
g
= 0.65, ʳ
o
= 45° API
1. Locate Point
a
by drawing a line through ʳ
g
= 0.65 and
R
sb
= 400
2. Draw a line from Point
a
through
T
Twf
= 180 °F, to
B
ob
3. Read
B
ob
= 1.24
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