Measurement of Water Holdup in Vertical Upward Oil–Water Two-Phase Flow Pipes Using a Helical Capacitance Sensor

Dai, Runsong; Jin, Ningde; Hao, Qing-Yang; Ren, Weikai; Zhai, Lusheng

doi:10.3390/s22020690

Cited by 12 publications

(2 citation statements)

References 30 publications

(34 reference statements)

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“…They found that there was a linear relationship between the sensor response and the water holdup for two-phase flow in a small pipe. Dai et al [32] designed a double helix capacitance sensor for vertical oil-water holdup measurement in a wide range of water cuts.…”

Section: Introductionmentioning

confidence: 99%

Comparison Between 180° and 360° Double Helix Capacitance Sensors for Measuring Water Holdup of Horizontal Oil–Water Stratified Flows

et al. 2023

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Flows of two immiscible liquids in horizontal pipes are often encountered in the petroleum industry. The complicated flow structures, which appear in horizontal oil-water two-phase flow, bring a great challenge to flow measurement. In this article, to investigate the feasibility of the double helix capacitance sensors for measuring the water holdup of the horizontal oil-water two-phase flow, the finiteelement method (FEM) is applied to analyze the sensitivity distributions of the sensors with the helical angles of 180 • and 360 • . Then, a horizontal oil-water two-phase flow test system is built. An experimental study is performed to compare the water holdup measurement characteristics of the two different double helix capacitance sensors. Overall, the 180 • double helix capacitance sensor is found to have better characteristics in the measurement of water holdup. The conclusion is supported by the sensor sensitivity compensation characteristics analysis with the FEM. Based on the measurement of water holdup, an experimental correlation is established between the water holdup and the water cut, and better results are obtained in the water cut prediction.

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Section: Introductionmentioning

confidence: 99%

Comparison Between 180° and 360° Double Helix Capacitance Sensors for Measuring Water Holdup of Horizontal Oil–Water Stratified Flows

et al. 2023

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“…Oil-water two-phase flow is common in the process of oil and gas development and processing. It is very important to monitor its physical parameters in real time, especially in the process of electric dehydration, where the two parameters of conductivity and water cut (and the relationship between them) are key to establishing an effective dehydration electric field [1][2][3][4][5][6]. Therefore, this investigation studies the method and system of synchronous measurement of conductivity and water content by dual-frequency digital demodulation technology.…”

Section: Introductionmentioning

confidence: 99%

Measurement Method of Physical Parameters of Two-Phase Flow Based on Dual-Frequency Demodulation

Song,

Yao,

Liu

et al. 2023

Sensors

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Oil-water two-phase flow commonly occurs in the process of crude oil electric dehydration. Here, through dynamic changes in the water content and conductivity of oil-water two-phase flow in the process of electric dehydration, the influence of water content and conductivity on the efficiency and stability of electric dehydration is analyzed. Using real-time in-line measurements of water content and conductivity, the electric dehydration system is kept in an optimal state, which provides a basis for realizing efficient oil-water separation. Measurements of the physical parameters of oil-water two-phase flow is affected by many factors, such as the temperature of the two-phase flow, composition of the two-phase flow medium, structure of the measurement sensor, coupling of the conventional resistance–capacitance excitation signal, and processing of the measurement data. This complexity causes, some shortcomings to the control system, such as a large measurement error, limited measurement range, inability to measure the medium water phase as a conductive water phase, etc., and not meeting the requirements of the electric dehydration process. To solve that the conductivity and water content of high-conductivity crude oil emulsions cannot be measured synchronously, the RC relationship of oil-water emulsions is measured synchronously using dual-frequency digital demodulation technology, which verifies the feasibility of our test method for the synchronous measurement of physical parameters of homogeneous oil-water two-phase flow. Experimental results show that the novel measuring method (which is within the target measuring range) can be used to measure water content 0~40% and conductivity 1 ms/m~100 ms/m. The measuring error of the water content is less than 2%, and the measuring error of the conductivity is less than 5%.

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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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Measurement of Water Holdup in Vertical Upward Oil–Water Two-Phase Flow Pipes Using a Helical Capacitance Sensor

Cited by 12 publications

References 30 publications

Comparison Between 180° and 360° Double Helix Capacitance Sensors for Measuring Water Holdup of Horizontal Oil–Water Stratified Flows

Comparison Between 180° and 360° Double Helix Capacitance Sensors for Measuring Water Holdup of Horizontal Oil–Water Stratified Flows

Measurement Method of Physical Parameters of Two-Phase Flow Based on Dual-Frequency Demodulation

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

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