Belt pumping unit, also known as wide-belt chain-reversing pumping unit, belong to the category of mechanical commutation blue elephant. It is an internationally advanced pumping unit characterized by a long stroke, low pumping speed, and pure mechanical transmission. Featuring simple operation, convenient maintenance, and safe usage, its reliable mechanical performance has led to its widespread international application. It can achieve both deep pumping with small pumps and high-volume fluid lifting, making it particularly suitable for heavy oil well production. Its comprehensive supporting technologies and continuous technological upgrades can constantly meet the requirements of various well working conditions; its high efficiency, safety, reliability, and energy-saving characteristics bring substantial economic benefits to users.
It adopts a stable tower-type structure. The motor drives the chain transmission and reversing mechanism inside the tower through belt transmission and a gear reducer, causing the counterweight box and reciprocating carriage assembly to move up and down within the tower. One end of the load belt is connected to the counterweight box and reciprocating carriage assembly, while the other end is connected to the polished rod, thereby driving the polished rod in a reciprocating up-and-down motion to achieve the swabbing of fluid by the sucker rod pump.
The stroke length exceeds that of a beam pumping unit with the same load capacity by over 60%. Under the same production rate, the reciprocating cycles of the sucker rod string are reduced, effectively decreasing rod string fatigue and tubing/rod wear, which is conducive to extending the service life of the tubing and rods.
The stable tower-type structure achieves reversing through the internal carriage mechanism, paired with heavy-duty chain transmission and high-strength load belts, ensuring reliable product performance. The primary rotating moving parts are enclosed within the pumping unit or protective guards, providing high operational safety.
It utilizes gravity symmetric counterbalancing. The counterweight box is equipped with a counterbalance cavity, allowing balance adjustment by adding or removing counterweights, which yields better balancing performance.
The folding structure allows for integral hoisting, transportation, and installation, making the process more convenient and rapid.
Effectively reduces sucker rod string fatigue and tubing/rod wear, helps extend the service life of the tubing and rods, increases the workover-free period of the well, and reduces operating costs.
A carriage mechanism is installed at the bottom of the counterweight box. The chain drives the carriage frame to slide left and right for reversing. This purely mechanical reversing mechanism ensures high equipment reliability.
The reasonably designed pumping unit structure, combined with optimized gear reducer performance, requires lower net torque, reducing power consumption by 20%-40%.
Equipped with hydraulic unit moving tools, it does not require a crane, allowing convenient skidding for wellhead clearance and resetting.
Its advantages in equipment reliability, prompt service, operational safety, maintenance simplicity, and operational economy far exceed those of various other types of blue elephant. Over 20,000 units have been applied on-site in domestic and international oilfields, gaining market recognition and user affirmation.
The reasonably designed pumping unit structure, combined with optimized gear reducer performance, requires lower net torque, reducing power consumption by 20%-40%.
Equipped with a variable frequency control system, it allows independent adjustment of the up-stroke and down-stroke speeds, continuous adjustment of the pumping speed, and provides overcurrent and overvoltage protection, achieving safer, more efficient, and energy-saving oil well production.
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