DGWS Wellbore Schematic Example
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
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
At Injecting 200 BWPD
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)
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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
4.70 lbs/ft
Tubing ID 1.995″
Tubing OD 2.375″
Production Casing (3000′)
5 ½” J55 15.50lbs/ft
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′
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%
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%
Maximum Plunger Velocity 5.8 ft/s (at 200 BWPD)
Net Area of the Top of the
Plunger that the Pressure is
Acting on 0.0092ft2
Maximum Instantaneous
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%