Environmental Engineering Reference
In-Depth Information
Everything is now in place to proceed with station-by-station analysis. The
procedure will be as follows for each station:
1. Read gradiomanometer log.
2. Convert reading to
y
h
(holdup value).
3. Plot total flow rate and
y
h
on the holdup-flowrate graph.
4. Read the water and oil flow rates on the
X
- and
Y
-axes.
5. Repeat process for next station.
Table 10.1
Tabulation of log data and calculations
Production
BWPD
Total flow
rate B/D
Amplified gradio
divisions
Station #
y
h
Q
w
Q
o
BOPD
1
850
5.5
0.6
365
485
278
242
2
330
7.5
0.67
87
243
87
243
4
0
17
1
0
0
In order to keep track of the log readings and the calculated answers it is useful
to work with a table of the sort shown in Table
10.1
. Note that the production rate
from any set of perforations can be deduced from the oil and flow rate found above
and below those perforations. A useful way of presenting the results is shown in
Fig.
10.6
. Flow rate is plotted against depth for both oil and water and one phase or
the other is shaded or color coded. Coded bar-graphs may also be used to show the
production from each set of perforations.
Fig. 10.6
Presentation of results of gradiomanometer analysis. Reprinted by permission of the
SPE, adapted from Curtis (1967)
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