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
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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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