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Engineering ESP

Engineering ESP. Calculation. Pump Sizing . Collect Data (well, production, fluid, electrical??) Determine production capacity of well Calculate Total Dynamic head (TDH) and determine tubing size Select pump stage Calculate number of stage required . Continue …….

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Engineering ESP

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  1. Engineering ESP Calculation

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

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

  4. 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 Example….. 1. Collect data

  5. 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

  6. 3. Calculate TDH @ 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 level @ 1300 BPD= Stat fluid level+ Drawdown feet =1820 ft +3335 ft =5155 ft

  7. Continue • Friction Loss= 31 ft/ 1k X5.5k ft= 170.5 ft

  8. 31 ft /1k ft

  9. Continue • WHP= 100 psi/ (.433 psi/ ft)=231 ft • Therefore, Total Dynamic Head =5155 ft+170.5+231 ft= 5556.5 ft

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

  11. 5. Calculate Number of Stages Req • @ 1300 BPD, DN1300 Generates 20.4 ft/stage. (from 60 Hz 3500 RPM pump curve) • Number of stages = TDH/ Head ft # of Stages= 5556.5 ft/ (20.4 ft/ stage)= 272 stages • However, Use full housing of 276 stage

  12. 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)

  13. 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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