Application of FGI FD500 Series Frequency Converter in Belt-driven Oil Pumping Units

The belt-driven pumping unit, as a significant innovation in modern oil extraction technology, operates by an electric motor driving a pulley, which in turn moves the pump core inside the elastic oil pipe in a reciprocating motion. Its core advantages lie in its high efficiency, stability, and ease of maintenance. Specifically, it can achieve an oil extraction efficiency 20% to 30% higher than traditional submersible pumps in various complex oil well environments, such as low-temperature, high-temperature, high-gas content, or highly corrosive conditions. Moreover, its simple structure and low maintenance costs mean that there is no need for frequent replacement of oil pipes and other components. In terms of environmental protection, the belt-driven pumping unit also performs well, effectively reducing energy consumption and minimizing groundwater pollution. In oilfield exploitation, this equipment is not only suitable for conventional oilfields but is also widely used in the extraction of unconventional energy sources such as unconventional gas, gas condensate, shale gas, and coalbed methane. Particularly in areas with relatively shallow water depths in oil wells, its liquid drainage effect is remarkable, contributing to the efficient and rational utilization of resources. The main advantages are as follows:

1. Long stroke, low frequency

The long stroke results in a high filling coefficient of the pump and high system efficiency; the low frequency can effectively reduce the fatigue and wear of downhole equipment, extend the maintenance-free period of oil wells, and reduce operating costs.

2. Pure mechanical rotation

The shifting is smooth, with large load, long lifespan, and heavy-duty wide belt for power transmission. Its elastic buffering can reduce shifting impact and make the downhole equipment run smoothly.

3. Energy saving

It requires low torque and is equipped with a small power motor and a small torque reduction box, which is 10% - 40% more energy-efficient than conventional beam pumping units.

4. Convenient operation and maintenance

It adopts gravity symmetrical balance, which is convenient and simple to adjust the balance; the moving parts of the entire machine are equipped with safety guards and railings, making operation and maintenance safe and convenient; it has high reliability and does not require frequent maintenance and repair.

FD500 series frequency converter：

The FD500 series frequency converter was developed by our company to meet the market demands of various application scenarios in the oil industry, such as submersible electric pumps, pumping units, and in the mining industry, for loaders and coal feeders. It has the following features:

1. High starting torque, smooth startup

The FD500 series products demonstrate excellent starting performance. At 0.5Hz, they can output 150% of the rated starting torque. The startup process is rapid and smooth, reducing the impact and wear on mechanical components and effectively extending the equipment's service life. This high starting torque characteristic enables the equipment to start easily under heavy load conditions, providing a solid guarantee for the efficient operation of industrial production.

2. Strong overload capacity, capable of handling complex conditions

In industrial production, equipment often encounters various complex conditions and overload situations occur frequently. The FD500 series products have strong overload capacity, capable of reaching 150% of the rated current for 60 seconds and 180% of the rated current for 10 seconds, operating stably under high load conditions, demonstrating outstanding reliability. Whether in harsh environments or in other industrial scenarios with high-intensity operations, the FD500 series can handle them with ease, ensuring the continuity and stability of production.

3. Excellent soft start-stop performance, protecting equipment structure

Frequent starting and stopping of equipment often cause significant impacts on its structure, affecting its service life. The FD500 series products have excellent soft start-stop performance. The acceleration and deceleration time can be continuously adjusted within the range of 0 to 60 minutes, and they have S-shaped acceleration and deceleration characteristics. This feature can effectively reduce the impact during startup and shutdown, providing good protection for the equipment structure, further extending the equipment's service life and reducing the equipment maintenance costs of enterprises.

4. Adopting a three-level topology structure, more adaptable to scenarios

Compared to two-level, the three-level topology has significant advantages in medium-high voltage, high-power scenarios, with better output waveform quality. It approximates a sine wave with +Vdc/2, 0, -Vdc/2 three-level, with low harmonic content, a total harmonic distortion rate reduced by more than 50%, reducing the cost of filter components, suitable for sensitive loads; the voltage stress on power devices is halved, only bearing Vdc/2, reducing the failure risk, supporting higher bus voltages; the switching loss is reduced by 30%-60%, the system efficiency is higher, up to 98.5% or more, and it is suitable for higher switching frequencies; the system design is flexible, reducing the need for series connection of devices, simplifying control, having low heat dissipation pressure, compatible with a wide range of input, suitable for new energy grid connection, energy storage and other scenarios.

On-site application cases：

On-site motor parameters:

The on-site FGI FD2000-055G-12-B inverter was configured. It has been operating normally for half a year, with stable performance. It has effectively improved the efficiency of the oil production system and achieved significant energy-saving effects, reducing the extraction cost.

The FGI FD2000 series frequency converters, with their outstanding performance and excellent practical application results, have solved many problems in the operation of traditional equipment for enterprises, providing strong support for the green development and intelligent upgrading of the industry.