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Method and system for detecting dead point of suspended point of polished rod in pumping well

A technology for pumping wells and detection methods, which is applied in the directions of measurement, drill pipe, earthwork drilling, etc., can solve problems such as unguaranteed accuracy, impact on displacement detection accuracy, dead point drift, etc., to achieve improved monitoring capabilities, convenient maintenance, and safety sex high effect

Active Publication Date: 2022-06-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the displacement detection method, the most commonly used method is to measure the position indirectly by measuring the acceleration, which can realize the wireless test of the displacement, simplify the test procedure, improve the reliability of the dynamometer measuring instrument and the accuracy of the displacement test data, However, there is a problem in the acceleration sensor measuring the displacement that the dead point drifts due to the acceleration oscillation of the dead point, which affects the displacement detection accuracy; for the dead point switch method, the dead point switch installed at the suspension point is easily damaged by collision
In summary, the current dead point detection method for the suspension point of pumping wells has problems such as high investment and maintenance costs, poor implementability, and unguaranteed accuracy.

Method used

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  • Method and system for detecting dead point of suspended point of polished rod in pumping well
  • Method and system for detecting dead point of suspended point of polished rod in pumping well
  • Method and system for detecting dead point of suspended point of polished rod in pumping well

Examples

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Embodiment 1

[0098] figure 1 Shown is a flow chart of steps of a method for detecting a dead center of a polished rod of a pumping unit according to an exemplary embodiment of the present invention.

[0099] like figure 1 As shown, this embodiment provides a method for detecting the dead point of the suspension point of the polished rod of the pumping unit, including:

[0100] Based on the synchronous dynamometer diagram, collect the electric power diagram X(i) of the pumping unit in one stroke cycle;

[0101] Set the time series x(i) based on the power diagram X(i), and calculate y'(i) according to the mean filtering formula to obtain the corrected time series

[0102] Based on the corrected time series Obtain the filtered output signal y(i);

[0103] Obtain the variance Qd(i) of the time series x(i) and the filtered output signal y(i);

[0104] The dead point of the suspension point is obtained based on the variance Qd(i).

[0105] Among them, the variance Qd(i) is:

[0106] ...

Embodiment 2

[0133] figure 2 A cycle electric power diagram of a pumping unit output synchronously with a dynamometer diagram according to an exemplary embodiment of the present invention is shown. image 3 A corrected one-cycle electrical power diagram according to an exemplary embodiment of the present invention is shown.

[0134] like figure 2 and image 3 As shown, the method of Example 1 is applied to the well numbered X109X102, and it can be seen that the electric power diagram of a pumping unit is collected based on the synchronous dynamometer diagram for one cycle. lag, figure 2 The acquisition of graphs to measure the fluid volume will lead to an increase in the effective stroke judgment, which will lead to an excessively large calculated fluid volume. The corrected electrical power diagram is as follows: image 3 As shown in the figure, the corrected one-cycle electric power diagram can achieve the purpose of on-line correction of drift dead center, and improve the working...

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Abstract

The invention discloses a method and a system for detecting the suspension and dead points of polished rods in pumping wells. The detection method includes: based on the synchronous dynamometer diagram, collecting the electric power diagram X(i) of the pumping well for one stroke cycle; setting the time series x(i) based on the electric power diagram X(i), and calculating y according to the mean value filter formula '(i), obtain the corrected time series based on the corrected time series to obtain the filtered output signal y(i); obtain the variance Qd(i) of the time series x(i) and the filtered output signal y(i) ); Obtain the dead point of the suspension point based on the variance Qd(i). Its advantages are: it can realize the online correction of the electric power diagram and the indicator diagram of the pumping well, and the real-time detection of the dead point of the suspension point is helpful to judge whether the displacement sensor of the indicator diagram is normal, and improves the monitoring ability of the working condition of the pumping well. The safety is high, and the practical application is easy to install, operate and maintain.

Description

technical field [0001] The invention relates to the field of working condition monitoring and liquid quantity measurement of oil pumping unit wells, and more particularly, to a method and a system for detecting the dead center of a polished rod suspension point of a pumping unit well. Background technique [0002] In order to improve the production efficiency and management level of oil and gas production enterprises, dynamometer diagrams are commonly used in oil wells in various oil fields to measure oil well fluid volume online and monitor oil well conditions. The dynamometer monitoring, diagnosis and measurement system consists of three parts: perception layer, transmission layer and application layer. Collect data such as dynamometer diagram of pumping unit and information on opening and shutting well through on-site sensor equipment, and transmit the data to the data processing unit RTU. RTU transmits the data to the server through wireless or wired network, and the ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00E21B17/00E21B43/00
CPCE21B47/00E21B17/00E21B43/00
Inventor 王军霞黄辉姜家厅王晓港刘德生
Owner CHINA PETROLEUM & CHEM CORP
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