Balance control device and method for walking-beam type pumping unit

Abstract

The invention discloses a balance control device and method for a walking-beam type pumping unit and belongs to the field of walking-beam type pumping units. The balance control device comprises a balance weight, a detection module, a control module and an executing module; the balance weight is capable of moving on a walking beam of the pumping unit in the lengthwise direction of the walking beam; the detection module is used for detecting operating current of a motor of the pumping unit on upper and lower strokes respectively; the control module is used for calculating electric power of the motor on the upper and lower strokes according to the operating current of the motor on the upper and lower strokes and judging whether the pumping unit is balanced or not, and when the pumping unit is unbalanced, moving direction and distance of the to-be-moved balance weight are determined according to the electric power of the motor on the upper and lower strokes; the executing module is used for moving the balance weight on the walking beam according to the moving direction and distance of the balance weight to be moved; when the pumping unit is unbalanced, the moving direction and distance of the balance weight to be moved are determined, and the balance weight is moved. Human duties are not needed.

Description

technical field [0001] The invention relates to the field of beam pumping units, in particular to a balance adjustment device and method of a beam pumping unit. Background technique [0002] The beam pumping unit is one of the main types of pumping units currently used in oil fields, and is mainly composed of a donkey head, a beam, a crank connecting rod mechanism and a motor. When working, the transmission of the motor becomes the up and down movement of the donkey head through the crank connecting rod mechanism and the beam, and the donkey head drives the plunger of the downhole oil pump to move up and down (up and down stroke) through the sucker rod, so that the crude oil in the well is continuously pumped out of the wellbore . [0003] Among them, the pumping unit is in a balanced state only when the motors perform roughly the same work in the upstroke and downstroke respectively. However, the motor needs to do a lot of work in the upstroke to make the donkey head lift...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: on the one hand, the manual balance adjustment method has many problems such as long balance adjustment time, low balance adjustment accuracy, high labor intensity, and high safety risks; On the one hand, the existing technology is to judge whether the pumping unit is balanced in the up and down strokes according to the measured current absolute value, because the phase of the operating current when the motor is in the reverse generating state is opposite to that of the operating current in the generating state, and the motor is in the In the state of reverse power generation, the pumping unit is unbalanced. Therefore, judging whether the pumping unit is balanced according to the measured absolute value of current will not be able to distinguish whether the motor is in reverse power generation state or power generation state, which will cause misjudgment

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