A theoretical model for a capacitance tool and its application to production logging

Liu, Xingbin; Qiang, Xifu; Qiao, Hetang; Ma, Guifu; Xiong, Jianghong; Qiao, Zhuoer

doi:10.1016/s0955-5986(98)00021-1

Cited by 21 publications

(8 citation statements)

References 1 publication

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“…However, the oil-water two-phase flow fluid structure is complex and cannot be simply regarded as the parallel or series connection of a resistor and a capacitor but the series and parallel connection of many resistors and capacitors. According to the experimental results of Liu Xingbin et al [31], the response of a capacitive sensor with a water cut is more similar to an S-shaped curve. When the water cut is very high or very low, the response of the capacitance sensor changes slowly with the water cut.…”

Section: Sensor Detection Principlementioning

confidence: 97%

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

Dai

Jin

Hao

et al. 2022

Sensors

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Oil–water two-phase flows widely exist in industrial production, especially in the petroleum industry. The liquid holdup is significant for understanding reservoir production characteristics and improving oil recovery. This paper focuses on the helical capacitance sensor for the measurement of water holdup of oil–water two-phase flows. A new double helix capacitance sensor with an electrode rotation angle of 360° is designed. The sensitivity field distribution of the sensor with different parameters is simulated by the finite element analysis method, and the optimal geometric size of the sensor is obtained. The measurement characteristics of the sensor under different flow conditions are investigated by dynamical experiments of vertical oil–water flows. By analyzing the response signal of the helical capacitance sensor, the flow pattern can be identified, and the apparent water holdup can be calculated. The results show that the proposed sensor is suitable to measure the water holdup in a wide range of water cuts. Even in flow conditions of a high water cut, the sensor still retains good resolution in the D O/W flow pattern. This study expands the water holdup measurement of a capacitance sensor in the case of an oil–water two-phase flow with a high water cut.

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Section: Sensor Detection Principlementioning

confidence: 97%

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

Dai

Jin

Hao

et al. 2022

Sensors

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show abstract

“…The capacitance of the sensor will vary only when the dispersed oil drops are adhered to the inner wall of the sensor. In this case, it can be considered that the inner insulation layer, at locations where oil drops or oil films are adhered, become thicker [6]. Then the varying capacitance part of the sensor can be described as…”

Section: ( )mentioning

confidence: 99%

Experimental study on cylindrical capacitance sensor

Liu³

et al. 2009

2009 IEEE Intrumentation and Measurement Technology Conference

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In this paper, a cylindrical capacitance sensor with a multi-layer structure was presented. The mathematical model in stratified flow was established and the sensor response in nonstratified flow was also discussed. Results of static experiments agreed well with the stratified model and showed a monotonic relationship between the sensor response and the water holdup. Dynamic experiments were carried out using a long pipeline with inner diameter (ID) 20mm. A section of plexiglas pipe with the same ID was installed on the line through which pictures of flow state could be shot by a camera. The mathematical model, experiments and results were detailed in the paper.

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“…Silva et al [8] measured the phase distribution on the pipe cross-section using a wire-mesh capacitive sensor. Liu et al [9] investigated the performance of a coaxial capacitance sensor in the water-hold-up measurement, and found that the region near the inner electrode had higher sensitivity. In general, the electrical method has advantages in terms of its simple structure, reasonable price, fast response etc.…”

Section: Introductionmentioning

confidence: 99%

Method based on parallel‐wire conductivity probe for measuring water hold‐up in near‐horizontal oil–water two‐phase flow pipes

Zhou

Jin

Zhai

2020

IET Science, Measurement & Technology

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A theoretical model for a capacitance tool and its application to production logging

Cited by 21 publications

References 1 publication

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

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

Experimental study on cylindrical capacitance sensor

Method based on parallel‐wire conductivity probe for measuring water hold‐up in near‐horizontal oil–water two‐phase flow pipes

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