Triol AT24 SR and AT24 RT product lines for controlling  Sucker Rod Pumps
10 / 08 / 2021 4508 Wyświetlenia
  • Products

Oil production with sucker rod pumps (here and after referred to as SRP) is the most common way to lift oil. This is due to their simplicity, efficiency, and reliability. At least two-thirds of active production wells are operated with SRPs. The cornerstone of oil production is to maximize production while reducing electricity costs. The installation of Triol’s variable frequency drives with downhole controllers can solve both issues.

Triol offers the user two variable frequency drive lines for controlling the SRP downhole controller:

SR line

  • Hinged cabinet with IP55 degree of protection;
  • Main circuit breaker;
  • Variable frequency drive;
  • Heating and ventilation system for open air operation;
  • Intelligent downhole controller with a 3.5'' or 5'' touch screen;
  • GSM/GPRS modem with remote antenna and web service for remote monitoring and configuration;
  • 3f + N panel outlet with circuit breaker for power supply to other devices.

RT line

  • IP54 or NEMA3R rated cabinet;
  • Main circuit breaker;
  • Variable frequency drive;
  • Heating and ventilation system for open air operation;
  • Intelligent downhole controller with 3.5" or 5" touch screen;
  • GSM/GPRS modem with remote antenna and web service for remote monitoring and configuration;
  • 3f + N panel outlet with circuit breaker for power supply to other devices.

The following options can be optionally installed in the cabinet:

  • Braking chopper and braking resistors;
  • Main choke or passive filter to reduce influence of VFD on mains;
  • Filter dU/dt or the sine-wave filter to protect VFD windings from peak overvoltages occurring during operation with VFD;
  • Bypass circuit for switching the motor of the SRP independently of the VFD.

Our challenges when developing VFDs for SRPs:

  1. Reduction of equipment cost;

  2. Ease of use;

  3. Increased well flow rate due to unique algorithms in the controller software.

Reduced cost of ownership -No braking resistor required

Thanks to the unique algorithms developed by Triol Corporation, when operating with a 4-quadrant load, the VFD monitors the current motor frequency and avoids the transition to the generator mode.

In regenerative mode, energy is stored in the DC-link of the VFD and can lead to an emergency stop. To avoid an emergency stop, braking choppers in the DC link and braking resistors are used to dissipate the surplus energy.

The algorithms used in the SR and RT VFD lines removes the need to use braking resistors, on which the excess energy from the DC link of the VFD is dissipated in the generator mode of motor operation, which leads to a saving in the SRP’s energy consumption.

-Minimization of electrical consumption

Due to the automatic filling level control of pumps, for wells with inconsistent flow, high gas content, etc., additional energy savings are achieved by controlling the number of pumping operations (motor speed).

The same economy is achieved through the smooth motor start-up, without motor starting currents, which additionally reduces the load on the pump rod and motor gearbox.

-No expensive rod load cell required

The author's algorithms of the SRP’s downhole controller allow the building of dynamograms without using a polished rod load cell. Installation does not require installation of this sensor – it saves time. No purchase of the load cell itself is required – a direct money saver in the implementation of the SC SHGN. The error that was achieved in the sensorless mode of building dynamograms was less than 2% of that which is given using the sensor.

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