A study on nonlinear vibration characteristics of gas storage well string based&nbsp; on the wavelet multi-scale transform

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (20) : 51-60.

A study on nonlinear vibration characteristics of gas storage well string based on the wavelet multi-scale transform

YAN Hang1, YAN Yifei2, YAN Xiangzhen

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Abstract

In order to explore the nonlinear vibration characteristics of the pipe string in a gas storage well injection process, the dynamic characteristics and frequency domain characteristics of the string in the wellbore were obtained.Firstly, according to the structural characteristics of the gas storage wellbore, a nonlinear vibration analysis method of the gas storage well string was established, and the mathematical equation of the nonlinearity of the tubular string was obtained by numerical solution.Secondly, an ANSYS simulation model was established according to the vibration model to simulate the inherentity of the r string.The characteristics were compared with the results of the mathematical model.Meanwhile, the transient dynamic response analysis of the gas storage well string was carried out to obtain the vibration effect of the column.Finally, the vibration of the gas string of the gas storage well was constructed in combination with the site conditions.An experimental device was designed as the vibration signal data acquisition terminal, and the vibration characteristic data were obtained through the nonlinear vibration experiment of the pipe string during the gas injection process.Taking the actual gas storage well J03-H1 as an example, the variation of vibration effect such as column pressure, wall speed and amplitude of gas injection process was analyzed.The results show that the model calculation results under the same production conditions are basically consistent with the ANSYS simulation results.With the increase of the column design, the annulus constraints have a great influence on the inherent characteristics of the column; low frequency pressure fluctuation is the important factor to induce the column vibration.Excitation source; with the increase of gas injection volume, the vibration effect of each column was obviously changed, which changes periodically.The near gas injection section and the well inclined section are the high-incidence areas where the gas storage well string generatesvibration, and the column is safe.Corresponding safety measures should be taken during production design and operation.

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underground gas storage / string / wavelet / nonlinear vibration / experiment.

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YAN Hang1, YAN Yifei2, YAN Xiangzhen . A study on nonlinear vibration characteristics of gas storage well string based on the wavelet multi-scale transform[J]. Journal of Vibration and Shock, 2019, 38(20): 51-60

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