PMPCP® System

PMPCP

The MPS Permanent Magnet Motor can be directly coupled with a PC Pump as a bottom drive arrangement to install in oil and gas wells. The PC pump is the ideal pump technology to use in wells with heavy / viscous oil, well fluid withmedium to high amounts of sand and/or gas and in fields where there is limited amount of electric power available. The MPS PM Motor can operate a PC Pump when directly coupled to it without the need for an expensive / unreliable gearbox as used in the ESPCP system and does not require any form of torque couplings or magnetic gearboxes to transmit the torque from the motor to the pump.

The MPS PM motor can be operated from 50 RPM to 7000 RPM and therefore can be used very efficiently in the PC Pump speed range of 100 to 1000 RPM for operating in different conditions. The long length of rods that are required for conventional PC Pump installations are eliminated. This in turn eliminates the high vibrations and increased number of failures associated with the rod string.

Applications of Interest

  • Deviated Wells with viscous / heavy oil
  • Gassy wells
  • Wells with high amounts of solids production
  • Wells with low production rates and
  • Wells withrotor centralizer issues, tubing wear and rod breakages
  • Wells with parting rotor / coupling issues which may be related to stick      slip issues
  • High dog leg severity applications
  • Fields with limited electrical power availability

Associated Benefits

  • High electrical and mechanical reliability
  • High electrical power cost savings due to significant reduction in                operating torque
  • Low heat rise will extend motor runlife
  • High Starting torque to free stuck pumps
  • Installation in offshore wells with secondary protection barriers (SSSV)
  • 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 MPS PM Motors are an ideal driver to operate PC Pumps in deviated or sandy wells due to the elimination of the Rods and the surface drive head. The bottom drive PM Motor system will provide a continuous torque to the pump rotor and eliminate any type of stick/slip issues that are associated with the variable torque delivery of the rod system that is related to winding action of the rods.

Motor Efficiency and Power Cost

Due to its unique control methodology, MPS PMMs are designed to operate at maximum efficiency and in PC Pump applications, the power saving could be anywhere between 30% to 80% depending on the application, the well profile, solids content and the viscosity of the oil being produced.

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.

The motor temperature rise is very small as there is very low frictional losses in the motor due to the low speed of operation, which leads to very reliable electrical system.

The MPS PMPCP® system is designed with complete focus on system reliability.

Technical Benefits

The PMPCP® system offers significant operational advantages in the production of deviated wells that contain heavy or viscous oil, high sand fractions, high paraffin content or that form emulsions during the production process.

  • Elimination of rod string and tubing failures
  • Low Profile / Small Wellhead Footprint
  • Power Saving
  • No periodic maintenance
  • No Noise
  • Operating wells with high solids or scale content
  • Offshore and subsea installations of PC Pumps

The distinction between MPS PM motors that drive the PMPCP™ and PMESP™ applications is their operating speed

The same high torque permanent magnet motor will operate through a speed range from 50 to 7000 rpm.MPS PM motors for PCP applications are specified at the conventional rated speed of PCPs, 300rpm. Eliminating rods also eliminates some of the speed restrictions and uncontrolled stick-slip at the pump that are inherent in rod-driven PCP systems. For this reason, additional curves for 600 rpm are also provided, permitting higher efficiency and lower system cost with the smaller displacement pumps and sand-free fluids that support this speed. PCP suppliers are generally more comfortable with speeds of 100 - 300rpm with large pumps. The MPS PMVSD™ drives are designed to work in this range and even right down to 50rpm: a total solution for rod-less systems.

The generic performance curves for MPS PM motors illustrate the following:

The efficiency has a high peak value which then declines with load. The reason is simple. Because of the low speed, the output power is low. The motor losses remain, so the efficiency must be lower. (In fact at the same torque, the motor losses are lower than at ESP speeds due to the low friction losses.) Increased output using increased speed will increase the efficiency.

The power factor is very high over the full range.

The speed is constant and known - the motor is synchronous and controlled.


Product Portfolio

 Series*  OD  Max Torque (300 rpm)
(Single Section)
 Max. Well Temperature  Max. Winding Temperature  Max. Length  Max. Efficiency
 456  4.56”  740 Ft-lb  350 F  400 F  30 Ft.  72 %
 562  5.62”  1520 Ft.lb  30 Ft.  78 %

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

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