1. PTE599 Advanced Production Engineering
Final Project Report (Spring 2011)
Water Injection System for an Oil and Gas Production
Operation: Calculations
Kevin Qi

2. Table 1: Well Information
Well
Top
Perforation
(ft.)
Bottom
Perforation
(ft.)
Injection
Distance
(ft.)
Distance
from
Pump (ft.)
Truck
Distance
(ft.)
1 5285 5376 5100 5807 707
2 5306 5389 1000 1250 250
3 5409 5475 200 1800 1600
4 5124 5179 1250 3150 1900
5 5374 5408 950 4150 3200
6 5356 5426 1325 6335 5010
MaximumWater InjectionPressure for each Well
Table 2: MaximumWaterInjectionPressures
Well Maximum Injection Pressure (Psi)
1 1321.98
2 1327.63
3 1355.35
4 1278.66
5 1345.92
6 1341.08
Pump Capacity
= 35400 bpd (given)

3. Figure 1: StandardPipe SchedulesandSizesChartTable Data
From chart, itcan be gatheredthat
WithSchedule 80 line pipe
6” Pipeline
Wall thickness=.432”
OD= 6.625”
ID= 5.761”
3” Pipeline
Wall Thickness=.3”
OD=3.5”
ID=2.9”
Pressure Drop
InjectionPipelines
3”, Schedule 80line pipe
Table 3: Pressure DropinInjectionPipelines
Well Length (ft.) Pressure Drop (psi)
1 5100 198.5
2 1000 38.92
3 200 7.784
4 1250 48.65
5 950 36.975
6 1325 51.57

4. Truck Pipelines
6”, Schedule 80line pipe
Table 4: Pressure DropinTruck Pipelines
Well Length (ft.) Q (bpd) u,oil (ft/s) N,Re 1/SQRT(fM) fM
Pressure Drop
(psi)
1 457 29500 10.596321 557367.031 8.13853021 0.0150976 12.83981435
2 250 35400 12.715586 668840.438 8.20006785 0.01487185 9.963274881
3 893 23600 8.4770571 445893.625 8.05533243 0.01541108 16.39075657
4 300 17700 6.3577928 334420.219 7.93517882 0.01588132 3.191867263
5 1300 11800 4.2385285 222946.813 7.74176275 0.01668477 6.458298619
6 1810 5900 2.1192643 111473.406 7.35247283 0.01849836 2.492333831
FluidVelocityof the injectionwater at eachjunction point isgivenin column 4
Pump Discharge Pressure
Table 5: PumpDischarge Pressure
Well Discharge Pressure (psi)
1 1543.28
2 1376.01
3 1402.33
4 1369.71
5 1431.76
6 1444.01
Table 6: Pressure Drop
Well Total Pressure Drop (psi) Actual Injection (psi)
1 221.3 1378.7
2 48.88 1551.12
3 46.874 1553.126
4 91.03 1508.97
5 85.815 1514.185
6 102.91 1497.09

5. Figure 2: Baker HughesPowerCurve
Numberof Stages for the Pump
Extrapolate datafrom35400 bpd
HeadPressure=68.5 psi/stage
Numberof Stages= 1543.28psi/68.5psi/stage= 22.53
= 23 Stages
Horse Power
Extrapolate datafrom35400 bpd
HP= 52 HP/Stage
Total HP= 52HP/stage*23 stages=1196 HP
Cost to Operate
Total kw=52HP/stage*23stage*.7457kw/HP=891.8572kw
Cost to Operate=.0515dollars/kwh*891.8572kw*24hrs*365days= $402,352.46 a year
Determine the InjectionSystemfor 35,400 bpd of WaterInjection
Basedon the above calculations,aninjectionsystemwithapump capacityof 35,400 bpd shouldhave a
discharge pressure of 1543.28 psi and total horsepowerof 1196 HP.The headpressure perstage of the
pumpshouldbe 68.5 psi/stage andthe total headpressure of the wells shouldbe 1370 psi.There should
be a total of 23 stages.The cost of thisinjectionsystemwill be $402,352.46 a year.

6. PIPESIMModel Calculation
Injectwell layoutsystemisfirstrecreated.
Figure 1: Well System
Parametersof tubing,pumps,and flowlines are thenadjusted.

7. Figure 2: TubingParameters
Figure 3: PumpParameters
Afterparametersare adjusted,the software canbe run.
Figure 5: PIPESIMoutput

8. The pressure resultsfromhandcalculationsare almostthe same asthe outputgivenbythe software.In
addition, the actual injectionpressure fromthe calculation andthe inletpressure of all the wells given
by the software are verysimilartoo.Itcan be concludedthatthe PIPESIMmodel confirmsthe
calculations.