Pumping unit indicator diagram acquisition method based on polynomial fitting

Abstract

The invention provides a pumping unit indicator diagram acquisition method based on polynomial fitting. The pumping unit indicator diagram acquisition method comprises the following steps: a wellheadcontroller RTU acquires N point set load displacement original data at fixed intervals according to a stroke period, and recombines indicator diagram data (Si, Fi) of dead points below the original data; data enhancement is carried out on the recombined displacement data points, and the data points are expanded to (1 + k) N point data sets Snew; n-order polynomial fitting is performed on the data,and polynomial coefficients a0, a1... an are calculated to obtain a Y (xi) polynomial function; and xi substitution calculation is carried out on the obtained function, so as to obtain a new displacement data set, and enhanced data is utilized and removed, and then new N-point indicator diagram data is formed. Through the polynomial curve fitting method, the pumping unit indicator diagram acquisition method is simple and efficient, and the stability and accuracy of displacement data acquisition are well improved.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a polynomial fitting-based acquisition method for an indicator diagram of an oil pumping unit. Background technique [0002] The traditional smoothing method to collect displacement data is difficult to meet the accuracy requirements of dynamometer data in the environment of large disturbance pumping units, and will produce a lot of invalid dynamometer data, which will affect the judgment of wellhead status and oil production rate of wellhead by big data. Therefore, it is necessary to improve the efficiency of power map data collection. Contents of the invention [0003] The aim of the present invention is to solve at least one of said technical drawbacks. [0004] For this reason, the object of the present invention is to propose a kind of method for collecting the indicator diagram of pumping unit based on polynomial fitting. [0005] In order to achieve the above objec...

AI Technical Summary

Problems solved by technology

[0002] The traditional smoothing method to collect displacement data is difficult to meet the accuracy requirements of dynamometer data in the environment of large disturbance pumping units, and will produce a lot of invalid dynamometer data, which will affect the judgment of wellhead status and oil production rate of wellhead by big data. calculation, so it is necessary to improve the efficiency of power map data collection

Images