Engineering ESP - New Mexico Institute of Mining and

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Transcript Engineering ESP - New Mexico Institute of Mining and

Engineering ESP

Calculation

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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6. Check loading of pump shaft and pump housing pressure.

7. Calculate motor horsepower requirements and select motor

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

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

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

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

31 ft /1k ft

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

4. Selecting Pump stage type

• Based on the desired flow rate(1300 BPD) • Select DN1300

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

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)

7. Select Motor

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