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 for a beam-pumping unit, and the method comprises the steps: firstly analyzing the movement rule and energy circulation mechanism of a pumping unit system, and building an incidence relation mathematic model between the change of an input electric power integral value of a motor and the balance degree of the pumping unit; secondly, collecting real-time operation electrical parameters of the beam-pumping unit, and calculating the power integral ratio of unit stroke or multi-stroke up-stroke and down-stroke to detect the balance degree of a pumping unit system on line; and finally, according to the calculated balance degree, judging the balance state of the oil pumping unit operation system, and adopting a servo method to control a motor to drive a lead screw to adjust the position of the balance box body to change the balance torque so as to adjust the optimal balance state of the oil pumping unit. Compared with the prior art, the iterative approximation follow-up leveling control method and the iterative approximation follow-up leveling control device for the beam-pumping unit have the advantages that the working efficiency and the production safety coefficient of balance adjustment of the pumping unit are improved, the energy saving rate can reach 3 percent, and the engineering applicability ishigh.

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 recovery. 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 bala...

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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