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DGWS Wellbore Schematic Example |
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Injection Rate
| Estimated Injection Rate 100 BWPD* |
(5.6spm slip speed, 86" stroke) |
| Maximum Injection Rate 240 BWPD* |
(12.4spm slip speed, 86" stroke) |
| Minimum Injection Rate 11 BWPD* |
(1.5spm slip speed, 60" stroke) |
*Operating at 24 hours per day
Injection Pressure
| Maximum Downhole Injection |
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| Pressure |
1819 psig |
RFI Conditions
| Runtime |
100% |
| Surface Casing Pressure |
85 psig |
| Bottomhole Temperature |
130oF |
| Upstroke Damping Factor |
0.150 |
| Downstroke Damping Factor |
0.160 |
| Ambient Temperature |
60oF |
| Wellhead Temperature |
103 |
| Fluid Level from Surface |
2764' |
| Flowing Bottomhole Pressure |
91 psig |
| DHI Plunger Diameter |
1.497" (1 ½" Insert Pump) |
| Pump Intake Depth |
2785' |
| Pump Liquid Fillage |
95 to 99% |
| Pump Intake Pressure |
100psig |
| Pump Plunger Friction |
85lbf |
| DSB Friction |
235lbf |
| DHI Plunger Length |
4' |
| Plunger Clearance |
0.003 |
| Valve Rod Size |
¾" |
| Downhole Stuffing Box |
¾" UTEX |
| Maximum Pump Fluid Load |
3038 lbf (at 200 BWPD) |
| Maximum T.V. Load |
6659 lbf (at 200 BWPD) |
| Maximum S.V. Load |
3621 lbf (at 200 BWPD) |
| Pump Barrel Length |
16' |
| Plunger Space off Bottom |
0.50" |
Fluids
| Water Cut |
100.00% |
| Oil Density |
No Oil |
| Water Density |
1.01 Sp. Gr. H2O |
| Gas Density |
0.70 Sp.Gr.Air |
| Solution GOR |
0 scf/STBO |
| Tubing Fluid Density |
1.00 Sp. Gr. H2O |
| Casing Fluid Density |
0.83 Sp. Gr. H2O |
| Bubble Point Pressure |
-15.0 psig |
Surface Pumping Unit
| Surface Unit Type |
Conventional |
| API Description |
C-228-246-86 |
| Rotation Direction |
Clockwise |
| Maximum Stroke Length |
86" |
Electric Motor
| Motor Type |
Oilfield Nema D |
| Motor Size |
20 hp |
| Voltage |
480 V |
| Phase |
3 Phase |
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| At Injecting 200 BWPD |
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| Cyclic Load Factor |
1.323 (at 200 BWPD) |
| Average Prime Mover Slip |
4.7% (at 200 BWPD) |
| Maximum Prime Mover Slip |
13.7% (at 200 BWPD) |
| Minimum Prime Mover Slip |
-0.5% (at 200 BWPD) |
| Motor Power Loading |
78.0% (at 200 BWPD) |
Variable Frequency Drive
| Size |
20hp |
| Voltage |
480V |
| Minimum Frequency |
7 Hz |
| Maximum Frequency |
80 Hz |
| Phase |
Three Phase |
| Features |
Pump Off Controller, Timer, Clock, Communications |
Tubing (2800')
| 2 3/8" EUE 8RD J55 Upset |
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| 4.70 lbs/ft |
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| Tubing ID |
1.995" |
| Tubing OD |
2.375" |
Production Casing (3000')
| 5 ½" J55 15.50lbs/ft |
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| Casing OD |
5.500" |
| Casing ID |
4.950" |
Rod String
| Rod Service Factor |
1.00 (New Rods) |
| Surface Stuffing Box Friction |
10.0 lbf |
| Polished Rod Diameter |
1 ¼" |
| Maximum Polished Rod Load |
9895 lbf (at 200 BWPD) |
| Minimum Polished Rod Load |
461 lbf (at 200 BWPD) |
| Buoyant Rod Weight |
3621 lbf (at 200 BWPD) |
| Surface Card Power |
10.6 hp (at 200 BWPD) |
| Pump Card Power |
7.1 hp (at 200 BWPD) |
| Polished Rod Length |
20.0' |
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| Rod Type |
Size |
Top Stress (psi) |
Bottom Stress (psi) |
Loading |
| API Grade D Steel |
0.875" |
17350max, 1720min. |
10803max, -1245min. |
55.8% |
| API Grade D Steel |
0.750" |
15145max, -1254min. |
5335max, -2446min |
56% |
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| Rod Type |
Size |
Weight |
Length |
Percent of Taper |
| API Grade D Steel |
0.875" |
2.224lb/ft |
1159' |
41.6% |
| API Grade D Steel |
0.750" |
1.634 lbs/ft |
1626' |
58.4% |
Rate Analysis at Injecting 200BWPD
| Pump Liquid Rate |
202.5 BWPD (90.9%) |
| Pump Gas Rate |
10.7 BWPD (4.8%) |
| Tubing Stretch Losses |
0.0 BWPD (0.0%) |
| Plunger Slippage Losses |
9.7 BWPD (4.3%) |
| Pump Total Rate |
222.8 BWPD (100.0%) |
| Pump Liquid Efficiency |
90.0% |
| Injecting Liquid Efficiency |
83.3% |
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| Maximum Plunger Velocity |
5.8 ft/s (at 200 BWPD) |
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| Net Area of the Top of the |
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| Plunger that the Pressure is |
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| Acting on |
0.0092ft2 |
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| Maximum Instantaneous |
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| Injection rate at 200BWPD: |
0.0533ft3/s (23.94gal/min or 821 BPD) |
Energy Analysis at Injecting 200BWPD
| Liquid Hydraulic Power |
5.9hp (40.6%) |
| Gas Compression Power |
0.1hp (0.5%) |
| Pump Losses |
1.1hp (7.8%) |
| Rodstring Losses |
3.5hp (24.0%) |
| Surface Unit Losses |
1.2hp (8.2%) |
| Motor Losses |
2.8hp (19.1%) |
| Consumed Electrical Power |
14.6hp (100.0%) |
| Generated Electrical Power |
0.0hp |
| System Efficiency |
40.6% |
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