PMESPĀ® System

PMESP

The Permanent Magnet Motor is an ideal driver for the centrifugal pumps used in the Electric Submersible Pump Industry. The MPS PM Motor can directly replace the Induction Motor that is used in the conventional ESP completions and provide significant operational benefits to the system.

The MPS PM motor can be operated from 50 RPM to 7000 RPM and therefore can be used very efficiently to optimize the production from the well and operate the pump at its Best Efficiency Point (BEP) at all times.

Applications of Interest

  • Gassy wells
  • Wells with low producing fluid levels
  • Wells in which an ESP system may be installed below the perforations
  • Wells with long perforation Intervals
  • Wells with scale issues due to motor heat rise
  • High dog leg severity applications
  • Fields with limited electrical power availability

Associated Benefits

  • High electrical and mechanical reliability
  • Electrical power cost savings
  • Short length allows deployment in crooked wells
  • Low heat rise will extend motor runlife
  • Minimum electrical losses at low loads
  • High Starting torque to free stuck pumps
  • Low repair cost
  • Short installation time

Salient Features

  • High Efficiency
  • High Torque across wide HZ/RPM operating range
  • High HP per unit length
  • Small oil expansion volume
  • No rotor magnetization current and very low inrush/starting current
  • Very low idle current
  • Current linear with load even at low loading

The low heat rise in the PM motor reduces the operating temperature of the internal components of the motor including the motor winding (magnet wire). This increases the reliability of the motor significantly and in some unconventional installations of the ESP system in applications where there may be low or no flow of fluid past the motor, like installation of the MPS PMESPĀ® system below the perforations without a shroud or a recirculation tube, prevents the motor from overheating and causing a failure.

The significantly shorter length of the motor increases the overall reliability of the motor as there are fewer rotors and rotor bearings (rotating parts)

Motor Efficiency and Power Cost

Due to its unique control methodology, MPS PMMs are designed to operate at maximum efficiency and they will operate at a minimum average 10 percentage points higher efficiency than an equivalent Induction Motor (IM).

Running a MPS PMM instead of an IM will result in power saving of more than 20%. The saving would be higher for gassy wells and with systems where the motor is designed to be lightly loaded.

Reliability

MPS Permanent Magnet Motors (PMM) are efficient electrically, have low internal mechanical friction, low internal heat rise and are significantly shorter than equivalent Induction Motors. These fundamental characteristics of PMM clearly address most of the failure modes related to Induction Motors in ESP applications.

The MPS PMESP system is designed with complete focus on system reliability.

Repair Cost

MPS PMM stators will be on average 50% shorter than the equivalent Induction motor stators and there are fewer rotors in the motor which enable quick repair and reduced assembly time. The high salvage rate of the PM rotors also help in significantly reducing the repair costs of motors.

Gassy wells

One of the main challenges when operating ESPs in wells with high Gas Volume Fractions (GVF) is slugging. Many devices have been developed to improve pump performance in high GVF environments, but when the well is slugging, induction motors driving an ESP will over heat and will most likely shut down on high motor temperature as the motor losses at low load are high even when the gas surrounding the motor has no heat transfer capacity to cool the motor.

PM motors react differently to gas slugs: Motor current will be reduced proportionally to the load and hence motor heat rise will be minimised. Furthermore, the motor current measured at surface is directly proportional to the pump load and will provide a quick and quantitative indication of well behavior.


Product Portfolio

 Series*  OD  Max HP (3600 rpm)
(Single Section)
 Max. Well Temperature  Max. Winding Temperature  Max. Length  Max. Efficiency
 456  4.56”  450  350 F  400 F  30 Ft.  92 %
 562  5.62”  1000  30 Ft.  95 %

*375 Series and 738 Series PM Motors are under development and scheduled for Q2 2017 commercial release.

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