Optimal pumping frequency adjustment method for pumping unit

Abstract

The invention provides an optimal pumping frequency adjustment method for a pumping unit. According to the method, a new pumping unit pumping frequency adjustment algorithm based on time series globalsearch is inserted in the existing digital pumping unit RTU measurement and control unit. The method comprises the specific steps that a motor power limiting technology is used to screen and determine the allowable frequency conversion range of a frequency converter; the maximum frequency of the pumping unit is set to the starting frequency, and the operation frequency is gradually reduced; for the collected polished rod load and displacement data of the pumping unit, the actual pump efficiency is calculated, and the product of the pump efficiency and frequency is used as the equivalent liquid production amount instead of the actual liquid production amount for data storage; the time series data of the equivalent liquid production amount are globally searched, and the optimal reasonable pumping frequency is quickly found; the motor frequency at the moment is taken as the optimal base frequency; and finally, the optimal base frequency of the pumping unit is finely adjusted to ensure that the optimal punching frequency can be accurate for a long time. The method is self-adaptive and can achieve the optimal pump efficiency under the premise that the pumping unit reaches the maximum liquid production amount.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering and automatic control, and mainly relates to an optimal pumping unit adjustment method based on time series global search. Background technique [0002] With the demand for high crude oil production and energy-saving technology in the process of oilfield development, the frequency conversion speed regulation technology of pumping units has been gradually popularized and applied in various oilfields across the country. Although the frequency conversion and speed regulation of the motor of the pumping unit makes it very easy to adjust the stroke frequency, it is difficult to determine the optimal stroke frequency of the pumping unit due to the complex working conditions of the rod pumping system and the incompleteness of measurement information. There is blindness in stroke rate adjustment, and it is urgent to study an effective method for reasonable on-line judgment and automatic adju...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems mentioned in the background technology, the present invention provides a time-series global search-based optimal stroke adjustment method for pumping units to overcome the shortcomings of the prior art in judging the best strokes of pumping units

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