What is Electric Submersible Pump (ESP)?
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Electric Submersible Pump (ESP) systems convert electrical energy into torque.
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ESPs add pressure to produced fluids by using a centrifugal pump powered up by a downhole electric motor.
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Electricity comes from surface using a power cable.
Why ESPs for High Volume Wells?
1- Centrifugal pumps are capable of producing higher rates compared to positive displacement pump types in oil well casing applications.
2- More horsepower can be delivered to the pump in oil well casing compared to other artificial lift methods.
3- Other artificial lift methods should be considered for lower production rates, as these are usually more economical.
4- It is important to consider the pump setting depth, downhole temperatures, and how the system will operate for various flow rates and conditions.
5- Chemicals and well conditions (abrasives) must be considered.
Advantages:
1- Main advantage of the electrical submersible pump is the flexibility of the system.
2- Can be used at low bottom hole pressures.
3- Can operate reliably in deviated wells.
4- Can be used effectively for offshore and onshore applications.
5- Operate under extreme conditions such as higher bottom hole temperature applications.
6- Can be utilized in harsh conditions (corrosion and scale) with alternative materials.
Disadvantages:
1- Cable temperature limits must be identified and reviewed.
2- Electrical power for required horsepower must be available.
3- Higher gas content can limit system capabilities.
4- Presence of solids may cause rapid wear and premature failure.
Data Required to Properly Design an ESP :
Because of the factors involved- and varying production rates, it is necessary to review all reservoir data to determine the most accurate pump selection and unit for each application.
- Especially in the initial stages, the inflow information is vital to any pump sizing for considering an electrical submersible pumping system.
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