A method for analyzing dynamic characteristics of multi-scale oil-gas-water multiphase flow
A technology of fluid dynamics and characteristic analysis, applied in the directions of instrument, calculation, character and pattern recognition, etc., to avoid modal aliasing, improve accuracy and effectiveness, and effectively and accurately discriminate the basis.
Active Publication Date: 2022-02-22
XI'AN PETROLEUM UNIVERSITY
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[0004] In order to overcome the above-mentioned defective of prior art, the object of the present invention is to propose a kind of multi-scale oil-gas-water multiphase flow dynamics of oil, gas, water multiphase flow that carries out Hilbert-Huang transformation with integrated empirical mode decomposition (EEMD) The characteristic analysis method, through EEMD decomposition, eliminates the aliasing phenomenon between noise and mode, and improves the accuracy and effectiveness of the Hilbert-Huang transformation multi-scale spectral characteristics of oil, gas and water multiphase flow measurement signals, which is more effective and accurate It can accurately analyze the dynamic behavior characteristics of different flow patterns of oil, gas, and water multiphase flows, provide more effective basis for flow pattern identification and multiphase flow parameter measurement, and avoid the effect of modal aliasing on the Hilbert-Huang transform multi-scale spectrum. Effect of characteristics
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[0054] combine figure 1 with figure 2 A method for analyzing dynamic characteristics of multi-scale oil-gas-water multiphase flow, characterized in that it includes the following steps:
[0055] Step 1: First, obtain the conductance fluctuation signal x(t) of oil, gas and water multiphase flow through the conductance fluctuation signal acquisition system;
[0056] The second step: EEMD decomposes the collected conductance fluctuation signal x(t) into multiple intrinsic mode functions IMF and a residual term, the expression is as follows:
[0057]
[0058] where C j(t) is the jth level IMF, r N (t) is the residual term.
[0059] Step 3: Calculate the energy of IMF at all levels, the formula is as follows:
[0060]
[0061] Step 4: Normalize the IMF energies at all levels, and the normalized energies are expressed as follows:
[0062]
[0063] in for the total energy.
[0064] Step 5: Calculate the IMF signal C at all levels j The correlation coefficient betw...
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A method for analyzing the dynamic characteristics of multi-scale oil-gas-water multiphase flow. The conductance fluctuation signal of oil-gas-water multiphase flow is collected through the conductance fluctuation signal acquisition system, the collected conductance fluctuation signal is decomposed by EEMD, and the IMF at all levels is normalized. Energy and correlation coefficient, according to the normalized energy and correlation coefficient to eliminate the noise mode, and then select the first few modes with higher energy for time-frequency analysis, so as to study and analyze multi-scale oil, gas and water multiphase flow dynamics characteristic. This method effectively separates the noise mode and the natural mode in the EEMD decomposition process, avoids the mode aliasing phenomenon, improves the accuracy and effectiveness of the multi-scale spectral characteristics of the Hilbert-Huang transform, and contributes to more effective and accurate It can accurately analyze the dynamic behavior characteristics of different flow patterns of oil, gas and water multiphase flow, and provide more effective and accurate basis for flow pattern identification and multiphase flow parameter measurement.
Description
technical field [0001] The invention belongs to the field of dynamic parameter identification and measurement of oil, gas and water multiphase flow, and in particular relates to a multi-scale oil, gas and water multiphase flow method for oil, gas and water multiphase flow using integrated empirical model decomposition (EEMD) to carry out Hilbert-Huang transformation. Analytical methods for phase flow dynamics. Background technique [0002] In the process of oil extraction, the produced fluid is mostly oil-water two-phase flow or oil-gas-water multiphase flow. Due to the insufficient grasp of the dynamic information of the oil and gas well produced fluid, it usually leads to early water breakthrough during the production process. , forced to shut down the entire oil and gas well, resulting in the shortened life of the oil and gas well and the decline in production, which seriously affected the economic benefits of the oil industry. Therefore, the study and analysis of the dy...
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IPC IPC(8): G06K9/00
CPCG06F2218/02G06F2218/00
Inventor 李利品刘科满高国旺童美帅袁景峰
Owner XI'AN PETROLEUM UNIVERSITY
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