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Published byChristian Money Modified about 1 year ago

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Engineering ESP Calculation

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Pump Sizing 1.Collect Data (well, production, fluid, electrical??) 2.Determine production capacity of well 3.Calculate Total Dynamic head (TDH) and determine tubing size 4.Select pump stage 5.Calculate number of stage required

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Continue ……. 6.Check loading of pump shaft and pump housing pressure. 7.Calculate motor horsepower requirements and select motor

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Example….. 1. Collect data Casing= 5.5” Perforation=6000’ Tubing=2.375” Pump set depth=5500’ Static fluid level=1820’ Downhole T=260F degree Wellhead P=100 psi Desire=1300 BPD Reservoir pressure=2598 psi

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2. Determination production Capacity of well Flowing fluid flow=Static fluid level+ Drawdown So, Max Drawdown (to prefs)= Flowing fluid (pref Depth)- Stat fluid Level Max Drawdown (to prefs) = 6000’-1820’= 4180’ Max drawdown P(psi)= Max Drawdown (to prefs)XPG Max drawdown P(psi)=4180’ X.433 psi/ft= 1810’ Max Flow (Drawdown to pref)= Max drawdown P(psi)XPI Max Flow (Drawdown to pref)= 1810’ X.9 BPD/psi = 1629 BPD

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3. Calculate 1300 BPD Flow level at 1300 BPD= Stat fluid level+ Drawdown Drawdown P (psi)= Desired / PI =(1300 /.9)=1444 psi Drawdown feet= Drawdown P/ PG Drawdown feet =(1444/.433)= 3335 ft Flowing fluid 1300 BPD= Stat fluid level+ Drawdown feet =1820 ft ft =5155 ft

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Continue Friction Loss= 31 ft/ 1k X5.5k ft= ft

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31 ft /1k ft

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Continue WHP= 100 psi/ (.433 psi/ ft)=231 ft Therefore, Total Dynamic Head =5155 ft ft= ft

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4. Selecting Pump stage type Based on the desired flow rate(1300 BPD) Select DN1300

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5. Calculate Number of Stages 1300 BPD, DN1300 Generates 20.4 ft/stage. (from 60 Hz 3500 RPM pump curve) Number of stages = TDH/ Head ft # of Stages= ft/ (20.4 ft/ stage)= 272 stages However, Use full housing of 276 stage

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6. Check Loading of pump shaft and housing pressure Pump HP=.315 HP/ stage (from curve) X 272 (# stages) X1 (SG)=87 HP Max shaft rating =125 HP (from curve) (therefore, shaft is OK) Max Head in oper. Range =24 ft/ stage X 276 stage= 6624 ft Max pressure oper. Range = 6624 ft X.433 psi/ ft= 2868 psi ( housing pressure rating is 5000 psi from pump technical date, thus housing is ok)

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7. Select Motor Motor HP required = pump HP= 87 HP Therefore, Select 456 series100 HP, 1350 Volts, 50 amp Intermediate motor because of T

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