Iterative approximation follow-up leveling control method and device for beam pumping unit

Abstract

The invention provides an iterative approximation follow-up leveling control method of a beam pumping unit. The method first analyzes the motion law and energy circulation mechanism of the pumping unit system, and establishes the change of the integral value of the electric motor input power and the balance degree of the pumping unit. The mathematical model of the relationship between them; secondly, by collecting the real-time operating electrical parameters of the beam pumping unit, and calculating the power integral ratio of the unit stroke or multi-stroke upstroke and downstroke, the balance degree of the pumping unit system is detected online; finally, according to the calculated balance To measure and judge the balance state of the pumping unit’s operating system, the follow-up servo method is used to control the motor to drive the screw to adjust the position of the balance box to change the balance torque so as to realize the adjustment of the best balance state of the pumping unit. Compared with related technologies, the iterative approximation follow-up leveling control method and device of the beam pumping unit of the present invention improve the work efficiency and production safety factor of the pumping unit balance adjustment, and the energy saving rate can reach 3%. Strong applicability.

Description

technical field [0001] The invention relates to the technical field of pumping unit control, in particular to an iterative approach follow-up leveling control method and device for a beam pumping unit. Background technique [0002] The balanced state operation of the beam pumping unit is one of the key factors to ensure safe and efficient oil production. When the pumping unit is in an unbalanced state, it will shorten the service life of the motor, increase the power consumption of pumping, destroy the uniformity of the crank rotation speed, make the head of the donkey swing unevenly, affect the normal work of the pumping unit and the pump, and cause pumping The vibration of the pumping unit shortens the service life of the pumping unit, and even causes unpredictable losses in severe cases. [0003] There are two main ways to control the balance of conventional pumping units: one is to manually increase the beam balance weight of the pumping unit itself or move the crank ba...

AI Technical Summary

Problems solved by technology

When the pumping unit is in an unbalanced state, it will shorten the service life of the motor, increase the power consumption of pumping, destroy the uniformity of the crank rotation speed, make the head of the donkey swing unevenly, affect the normal work of the pumping unit and the pump, and cause pumping The vibration of the pumping unit shortens the service life of the pumping unit, and even causes unpredictable losses in severe cases

[0003] There are two main ways to control the balance of conventional pumping units: one is to manually increase the beam balance weight of the pumping unit itself or move the crank balance weight. This method is basically calculated by the technicians. After moving the distance or the number of beam balance blocks that need to be increased, the operator will perform high-intensity balance adjustment work, which will lead to low work efficiency, difficult operation, and waste of manpower and material resources. largely affected by human subjective operation

The second is that when the balance counterweight of the pumping unit itself cannot continue to adjust the balance of the pumping unit, the balance adjustment device is installed on the pumping unit to continue the adjustment. At present, the way to achieve automatic balance adjustment is to directly replace the digital pumping unit or It is realized by installing mechanical parts (drum device) on the original pumping unit. This kind of adjustment method needs to adjust the balance under the static condition of shutdown. It belongs to the static leveling method. operating in an unbalanced state

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