Effect of solid particles on the slug frequency, bubble velocity and bubble length of intermittent gas–liquid two-phase flows in horizontal pipelines

Sassi, Paolo; Fernandez, Gonzalo; Stiriba, Youssef; Pallarès, Jordi

doi:10.1016/j.ijmultiphaseflow.2022.103985

Cited by 7 publications

(1 citation statement)

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“…Hence, the oil produced from the oil well is often not a single crude oil but a mixture of crude oil, natural gas, and water, resulting in a complex situation of the three-phase mixed flow of oil, gas, and water in the vertical rising pipe diameter. The gasholdup in oil-gas-water three-phase flow [1], [2] refers to the proportion of gas phase in the mixed fluid. Therefore, real-time dynamic monitoring of oil well production is carried out, and the gas holdup is a significant parameter in multiphase fluid flow.…”

Section: Introductionmentioning

confidence: 99%

Study on Optical Fiber Gas-Holdup Meter Signal Denoising Using Improved Threshold Wavelet Transform

Chen

2023

IEEE Access

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The optical fiber probe gas-holdup meter is a new logging tool, which can be used to measure the gas-holdup of oil-gas-water three-phase flow during production logging. In this paper, the wavelet transform is used to denoise the measured gas-holdup signal of the optical fiber probe. For the wavelet transform threshold de-noising method, the existing hard and soft threshold functions have certain defects. So we propose a wavelet transform denoising method with an improved threshold function, and use this method to denoise the measured gas-holdup signal of the optical fiber probe. The signal-to-noise ratio, root mean square error, smoothness, and correlation coefficient are used as the evaluation indexes of signal denoising effect. The improved threshold function is between the hard threshold function and the soft threshold function. It has the advantages of both hard and soft threshold functions, can effectively overcome the discontinuity of the hard threshold function and the constant deviation of the soft threshold function, and improves the denoising efficiency of the gas-holdup signal. The proposed method is applied to the synthetic data and the real gas-holdup signal of the optical fiber probe respectively. Compared with the traditional soft and hard threshold functions, the experiment results show that the improved threshold wavelet denoising method is feasible. And it is effective in the gas-holdup signal denoising, improving the signal-to-noise ratio, reducing root mean square error, and increasing the correlation coefficient. The proposed method preserves well the original features of the measured gas-holdup signal, which provides a reference for the signal processing and dynamic monitoring analysis of the subsequent oil-well downhole development.INDEX TERMS Improved threshold function, wavelet threshold, optical fiber gas-holdup meter, denoising, gas-holdup.

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Section: Introductionmentioning

confidence: 99%