A Friction Factor Identification Method for Rod Pumping System Based on Moment Characteristics of Indicator Diagram
A friction factor and identification method technology, which is applied in the field of identification and optimization of pumping well model parameters, can solve the problems that cannot meet the requirements of actual identification, the Fourier coefficient results have a large influence, and the rod vibration has a large influence, so as to avoid local information. Missing out, avoiding the mechanism analysis process, calculating simple effects
Active Publication Date: 2022-03-08
NORTHEASTERN UNIV LIAONING
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This method can realize the parameter identification of directional wells where the Coulomb friction cannot be ignored, but the selection of the Fourier coefficient in the application of this method has a great influence on the results, and even leads to information loss; The features of dimension and scale range are not processed, resulting in the amplification of some features; at the same time, this method performs feature extraction on the suspension point dynamometer diagram, and the result is greatly affected by the vibration of the pole column, which cannot meet the requirements of actual identification
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[0049] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following examples are intended to illustrate the invention, but not to limit the scope of the invention.
[0050] Such as figure 1 As shown, the method of this embodiment is as follows.
[0051] Step 1: Value in the form of the oil pump in the form of the pumping pump in the rod-stroke, the pump diameter, the pump deep, the column combination, the pump diameter, the pump deep, the column combination, the oil and the rod column. Simulation get an analog pump function.
[0052] In the pump dynamic numerical simulation, such as figure 2 As shown in the downhole pump dynamic drawing, a working cycle of the pump is generally divided into four processes, the loading process (Figure AB), the inhalation process (Figure Bc section), unloading process (Figure CD segment) and discharge process (Figure DA). Formula (1) is boundary conditions in the form of analog pump work:
[0053]
[0054] In the formula, u (l, t) is the displa...
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The invention provides a method for identifying the friction factor of a rod pumping system based on the moment characteristics of the dynamometer diagram, and relates to the technical field of identification and optimization of pumping well model parameters. The method simulates the working form of the oil well pump through the main parameters of the oil pumping system to obtain the simulated pump power diagram; the simulated pump power diagram is obtained by differentially solving the measured suspension point indicator diagram; the normalized simulated pump power diagram and the simulated pump power The graph is partitioned based on the angle; the three low-order invariant moment features of the Hu invariant moments are calculated on each sub-region, and the moment value sequence representing the shape feature of the dynamometer graph is obtained; the moment value sequence is standardized as two The eigenvectors of the group graphics; use the eigenvectors to establish the standardized Euclidean distance to measure the similarity of the two pump power diagrams; use the particle swarm optimization algorithm to optimize the friction factor, and obtain the friction factor value that minimizes the standardized Euclidean distance, which is the corresponding extraction The friction factor identification value of the oil system. The invention has high simulation precision, simple calculation method and convenient application.
Description
Technical field [0001] The present invention relates to identification optimization techniques of parameters of the drawing well model, and more particularly to the friction factor identification method of a rod oil feeder system based on the function torque characteristics. Background technique [0002] For a rod oil estate, the underground device is difficult to measure directly at high temperatures, high-pressure environments, striking rods, and pumping pumps. Our usual practice is to establish a diagnostic model to solve the pump function through the ground showing power map. In the actual production, it is found that with the results of the measured power map and the check pump result, as the increase in the oil-based factor is constantly changing until it is the main factor affecting the well working conditions, we often use the model to solve the usual use. The damping coefficient, which seriously affects the accurate judgment of the working conditions, and even produces a...
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IPC IPC(8): E21B47/009E21B47/00G06Q50/02
CPCG06Q50/02E21B47/00E21B47/008
Inventor 高宪文李东玉张遨王明顺李翔宇李书行
Owner NORTHEASTERN UNIV LIAONING