Electric Submersible Pumps (ESP).pdf
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Transcript of Electric Submersible Pumps (ESP).pdf
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Electric Submersible Pumps (ESP)
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When there is not sufficient lift pressure to lift the fluids in the well, then we need an artificial lift (AL) method, e.g., ESP or any other alternative methods.Based on the reservoir and well characteristic, the engineers select the suitable (AL) method.ESP introduce energy (lift) into the system at a certain depth
Electric Submersible Pumps (ESP)
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ESP system:The ESP system comprises:- Downhole pump,- Motor,- Protector,- Gas separator,- Electric power cable,- Surface equipment
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Electric Submersible Pumps (ESP)
Summary: ESP’s are best for these conditions:Moderate to very high rates (500 - 50,000 bbl/d)Low gas liquid ratios (GLR < ~200)High drawdown (to FBHP=150 psi) is OK.Few solids (e.g. sand, scale)Not too hot (temperatures above ~200o may limit horsepower,
problems above 300o).Not too deep ( ~12000’ max.)Stable inflow performance and good data available for design.High quality supply of HVAC electricity. Continuous operation (few stop/starts)Larger casing sizes are better.Deviation (even horizontal) is OK.
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Electric Submersible Pumps (ESP)
Motors are manufactured in four different diameters (series) 3.75, 4.65, 5.4, and 7.38 in (7.5-1000 hp).
Thus motors can be used in casing as small as 4.5 in
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Electric Submersible
Pumps (ESP)***
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Electric Submersible Pumps (ESP)
To Equalizer
ShaftTo Pump
Gas and liquid to
pump
Gas and liquid
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To Equalizer
ShaftTo
PumpLiquid
to pump
Gas to annulus
Separator
Impeller
Standard intake
Gas and
liquid
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Trouble Shooting
- Gather information before going to well site ( Recent production history, latest down time information etc. )
- Note down trip & warning alarms.
- Review ammeter charts.
- Get assistance from electrical if required.
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Ammeter Technology-Ammeter chart is the most valuable tool for Monitoring an ESP well.
-It is an important tool for problem solving.
-It is to be kept for future references.
-If the unit tripped on underload, the unit will time out and restart automatically (if the provision is connected).
- If it tripped on overload the problem may be serious, check thoroughly before restart.
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Interpretation of Ammeter Charts:- Ammeter charts are circular recordings of motor current versus time.
- 24 hr or 7 day charts are being used.
- 24 hr charts provide more details for analysis and are used in new wells.
- Otherwise 7 day charts are generally used.
- With experience the operator can use ammeter charts for problem solving.
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- Unit running continuously- Amperage recording is smooth- It is motor name plate amps- It is normal run
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Power Fluctuations:Blips or kicks shown at intervals due to start up of other equipment
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Pump started at 6 am
Normal run up to 9.15 am
Production rate declined.
Production became gassy
Gas locked & tripped at 10.50 am
Correction:-Lower the pumpIncrease down timeChange out pump in the next pull out
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