Modelling of ultrasonic method for measuring gas holdup of Oil-Gas-Water three phase flows

Ren, Weikai; Jin, Ningde; Zhang, Jiachen

doi:10.1016/j.ultras.2022.106740

Cited by 9 publications

(2 citation statements)

References 36 publications

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“…Experimental measurement is the principal means to study the gas holdup, and it is also an essential means to research the three-phase flow of oilgas-water. A variety of methods for measuring gas holdup have been developed at home and abroad, such as the fast closing valve method, conductivity probe method, capacitance method [3], ray method, ultrasonic method [4], highspeed photography, etc. Still, each of these methods has its limitations and particular pertinence.…”

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%

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

Chen

2023

IEEE Access

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“…超声作为液体中最佳的信息载体, 由气泡引起的声能量衰减、声速变化、目标强度和散射截面等均与气泡尺寸和数量等信息直接相关. Weikai Ren 等 [12] 设计了脉冲超声和双光纤探头组合测量系统, 利用声衰减测量气泡直径, 并对三相流中气泡含量进行了定量研究. Leighton 等 [13] 通过测量气泡引起的声速变化, 对水下沉积物表面气泡大小分布进行量化. Padilla 等 [14] 实验建立了水下气体通量与声背散射强度之间的关系, 对南加州海岸圣巴巴拉海峡油田天然气的通量进行评估, 并对该区天然气分布予以描绘.…”

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Size quantification of non-spherical bubbles by ultrasound

Ya-Jing¹,

Fan²,

Lei³

et al. 2023

Acta Phys. Sin.

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Ultrasonic detection is an effective method to quantify bubbles in opaque liquid, and acoustic scattering model is the key in ultrasonic inversion technique. Classical scattering models are usually based on the spherical assumption and ka is much less than 1. However, these conditions are not always satisfied in practical applications. In this study, a quantitative strategy of ultrasonic inversion is proposed for non-spherical bubbles and ka deviation assumption. A series solution model for a spherical gas bubble is established without considering the ka constraint, and it was compared with the classical Medwin (ka<<1) and Anderson (ka≈1) models. The difference in their scattering cross sections σbs is only at the higher order formants of scattering and so the fitted line can be used to solve the multi-valued problem between σbs and ka. For a non-spherical bubble, σbs is determined by the frequency domain backscattering signal and size is characterized by the equivalent radius a*and the inversion is performed by fitted curve from series solution model. Ultrasonic quantitative results were examined by high-speed photography. Results show that bubble rises in a zigzag pattern and non-spherical bubbles, their scattering cross sections are measured by the frequency domain scattering signal obtained at a position of ultrasonic measurement and the equivalent radius is inverted by the series solution fitting curve. The deviation between the results and the actual results r0 is about 1mm(relative error less than 45%) when 9≤kr0≤35. This method can be used for acoustic inversion of non-spherical bubbles in a certain range of measurement accuracy.

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Phase volume fraction measurement of vertical oil–water-gas flow using integrated optical-electrical coaxial cross-modal probe sensor

Hao,

Kong

et al. 2024

Experimental Thermal and Fluid Science

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Modelling of ultrasonic method for measuring gas holdup of Oil-Gas-Water three phase flows

Cited by 9 publications

References 36 publications

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

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

Size quantification of non-spherical bubbles by ultrasound

Phase volume fraction measurement of vertical oil–water-gas flow using integrated optical-electrical coaxial cross-modal probe sensor

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