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
CN110410057BActive Publication Date: 2022-06-21CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2022-06-21

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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.
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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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