1. Implemented soft start, soft stop, and speed regulation operation process control
The starting current is small, the speed is stable, the performance is reliable, and the impact on the power grid is small. It can achieve arbitrary adjustment of the up and down speed and closed-loop control operation.
2. The pumping frequency, speed, and liquid production of the pumping unit can be determined based on the liquid level and pressure of the oil well
Can effectively reduce energy consumption. Improve pump efficiency, reduce equipment wear, and extend service life
3. A dedicated application program for pumping units, with simplified design, suitable for direct debugging by ordinary oil recovery workers
4. Built in input filtering device, full process noise filtering, and interference to the power grid is 1/4 of that of ordinary commercial frequency converters
5. Full voltage automatic tracking, automatic calculation of optimal braking torque, simplifying the operation of application links
6. Built in feedback braking unit, which can feed back the regenerated electrical energy to the grid. Built in reactor and filter, can be directly connected to the power grid, with an energy feedback efficiency of up to 97%. 15%~25% more energy-efficient than general frequency converters, with heat loss below 3% of resistance braking, reducing heat sources, and enhancing safety
7. All round drive, compatible with permanent magnet synchronous motor and asynchronous motor control
8. It has multiple protection functions such as overcurrent, short circuit, overvoltage, undervoltage, phase loss, overheating, etc., ensuring safer and more reliable system operation
9. Unmanned and fully automated design in the field, allowing for arbitrary control of pumping speed without the need to replace mechanical equipment. Suitable for oil wells in different regions and structures, suitable for occasions with different climates and conditions
10. Optional wireless communication module for seamless integration with oilfield digital systems
The energy-saving renovation project of a certain oil field pumping unit all uses PAD oilfield kowtow machine energy-saving and control devices. According to the motor equipped in the oil field, this project adopts two types of frequency converters with power of 37kW and 45kW.
PMD oilfield pumping unit energy-saving and control device
After the renovation, the electrical control system of the current variable frequency speed control pumping unit in the oilfield retains the original power frequency circuit, so that the pumping unit will not stop when the variable frequency circuit fails, thus not affecting the crude oil production. The main circuit is shown in the following figure:
PMD oilfield pumping unit energy-saving and control device
On site testing was conducted on 16 oil wells installed at stations 20, 60, and 83 in a certain oil extraction operation area. By comparing the power frequency and frequency conversion states, calculations were made
The average active power saving rate of oil wells is 23.34%
The average low-power saving rate of oil wells is 83.77%
The comprehensive energy-saving rate of oil wells is 26.46%
The average annual energy saving of a single well is 19038.99 kWh
The use of PMD oilfield kowtow machine energy-saving and control device in this project has significant advantages:
(1) Save electricity and improve efficiency. The single well efficiency has increased by about 6%, with an average active power saving rate of 20.93% and an average comprehensive power saving rate of over 25%.
(2) Easy to operate and simple to debug. During the project experiment and testing period, the oil production plant staff can operate proficiently in a short period of time. PMD is specially developed for oilfield pumping units, with fully encapsulated design parameters, reliable performance, few debugging parameters, and simple operation.
(3) The design of the frequency conversion feedback integrated machine has a compact and beautiful structure, saving installation space.
(4) After directly adjusting the transmission ratio and completing the debugging, simply input the impulse, which is convenient and fast.
(5) Improving the power factor on the grid side reduces reactive power and saves operating costs for upstream equipment
(6) The reduction in equipment operation and maintenance costs enables soft start of the motor, and the current has no impact on the power grid during startup; Extended maintenance cycle and reduced maintenance costs; There is no heat source in the control cabinet, and the operating environment of electrical equipment has been improved.
(7) Adding electrical protection has multiple protection functions such as overcurrent, short circuit, overvoltage, undervoltage, phase loss, overheating, etc., providing more comprehensive protection for the motor.
(8) Improving automation control can be achieved by directly adjusting the speed of the pumping unit through a frequency converter, which can infinitely adjust the pumping frequency of the pumping unit, facilitate remote centralized monitoring, and facilitate the detection of equipment operation status.
