Borets Canada
Permanent Magnet Motors
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The Borets Permanent Magnet Motor (PMM) is designed for the same ESP systems as induction motors. However, the PMM shows better performance in harsh environments, such as viscous fluids, high solids content, unstable inflow, low production, post hydro-fracturing or any other artificial lift methods applied.
Moreover, it facilitates the operating procedure for well commissioning.
Under certain operating conditions, a sucker-rod pumping system can be replaced with an ESP system featuring a permanent magnet motor.
The PMM design is similar to the induction motor design, though the PMM uses a rotor with permanent magnets that are made of sintered hard-magnetic materials.
PMM Operating Principle
The magnets supply the rotor flux that requires less electric power. The operation of a rotor and stator is synchronized due to the rotor and stator flux maintained at 90° angle, and thus the rotor slip tends toward zero.
To make the PMM suitable for the ESP system, it is equipped with a high-speed rotor. The rotor rotation speed ranges from 500 to 6000 rpm.
The PMM designed for ESPCP is equipped with a low-speed rotor. The rotor rotation speed ranges from 250 to 2000 rpm.
Borets has carried out a series of research studies
A set of measurements have been made to define power consumption of ESP systems operated by several oil companies and installed in wells with equal operating conditions. The wells were equipped with induction and permanent magnet motors of the same horsepower and variable frequency drives.
According to our estimates and calculations, the ESP system operating with a PMM is up to 20% more energy efficient than the ESP system with IM.
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