Method and system for recognizing and judging pump indicator diagram

A technology of dynamometer diagram and feature method, applied in the identification and judgment method of pump dynamometer diagram and its system field, which can solve the problems of misjudgment of recognition results and other problems, achieve accurate judgment and improve the effect of recognition accuracy

Active Publication Date: 2011-09-14
PETROCHINA CO LTD
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Problems solved by technology

Although the classifier is an optimal classifier in a certain sense, it cannot meet this precondition for the classification of oil production system operating conditions, which leads to misjudgment of the recognition results

Method used

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  • Method and system for recognizing and judging pump indicator diagram
  • Method and system for recognizing and judging pump indicator diagram
  • Method and system for recognizing and judging pump indicator diagram

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Experimental program
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Embodiment Construction

[0023] Such as figure 1 As shown, a method for identifying and judging a pump dynamometer diagram provided by an embodiment of the present invention includes:

[0024] Step S1, preprocessing the pump dynamometer diagram to extract the information of the pump dynamometer diagram. This step includes:

[0025] Step S11, generating a pump dynamometer diagram. According to the fault diagnosis model of rod pump oil production system (which is the existing technology, no more details will be given), the pump dynamometer diagram obtained by solving is based on the pump displacement s p is the abscissa, and the corresponding pump load F p It is a closed curve on the ordinate, which describes the change law of the pump load with the pump displacement. The solution results of the pump dynamometer diagram are given in the form of two discrete data pairs:

[0026] (θ i ,s pi ), i=0, 1, Λ, 2N(1.1),

[0027] (θ i , F pi ), i=0, 1, Λ, 2N(1.2),

[0028] θ in the formula i 2N+1 equa...

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Abstract

The invention discloses a method and system for recognizing and judging a pump indicator diagram. The method comprises the following steps of: pre-processing the pump indicator diagram, and extracting pump indicator diagram information; normalizing the pump indicator diagram according to the pump indicator diagram information; performing polygonal approximation processing on the normalized pump indicator diagram; and recognizing a fault in the pump indicator diagram, which is subjected to the polygonal approximation processing, by using a vector characteristic method. The system comprises a pump indicator diagram pre-processing module, a normalization processing module, a polygonal approximation processing module and a fault recognizing module. By the method and system for recognizing andjudging the pump indicator diagram, provided by the invention, the pump indicator diagram recognition accuracy rate of a deep well can be improved, and the working condition of an oil well is accurately judged.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a method for identifying and judging a pump indicator diagram and a system thereof. Background technique [0002] The dynamometer diagram of the downhole pump of the pumping well is the basis for diagnosing the working state of the pumping system, and most of the existing oil well diagnosis systems at home and abroad use this basis. The key to the diagnosis is the accuracy of the identification of the dynamometer diagram of the downhole pump. The more accurate the identification, the more correct the diagnosis conclusion. The key to image recognition is how to extract its most representative features. At present, most of the feature extraction of pump dynamometer diagrams use expert physiognomy method, area method, template matching method grid method, vector method and so on. These methods focus on extracting the features of pump dynamometer diagrams, such as geometry, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62F04B51/00
Inventor 黄伟徐永高郭方元杨瑞胡美艳辛宏李明江
Owner PETROCHINA CO LTD
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