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Imaging measurement method for gas holdup of gas-liquid two-phase flow of a single optical fiber array sensor

A gas-liquid two-phase flow, array sensor technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of limited success rate, small fiber probe size, and high gas phase sensitivity, so as to improve measurement accuracy and reduce Measuring the effect of blind spots

Inactive Publication Date: 2019-06-07
TIANJIN UNIV
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Problems solved by technology

The electric probe method is a feasible method to obtain the local gas holdup rate. However, because the electric probe method is prone to electric polarization, the success rate of the electric probe method for measuring the local gas holdup rate is limited.
The fiber optic probe is small in size and has high sensitivity to the gas phase. Generally, the mobile fiber optic probe method can be used to measure the gas holdup in the radial direction of the pipeline. The gas holdup distribution characteristics of the pipe section cannot be reconstructed from the local gas holdup measurement

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  • Imaging measurement method for gas holdup of gas-liquid two-phase flow of a single optical fiber array sensor
  • Imaging measurement method for gas holdup of gas-liquid two-phase flow of a single optical fiber array sensor
  • Imaging measurement method for gas holdup of gas-liquid two-phase flow of a single optical fiber array sensor

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Embodiment Construction

[0021] In order to investigate the distribution behavior of the gas holdup in the pipe section in the gas-liquid two-phase flow, the innovative idea of ​​the present invention is to break through the measurement mode of the radial fiber probe in a single direction by adopting the distributed optical fiber probe measurement method, and propose a simultaneous A measurement method for capturing the local gas holdup at 16 measurement positions in the gas-liquid two-phase flow pipe section. In terms of measurement methods, 16 single-fiber probe sensors are placed in the small-diameter measurement pipe after the current collection. The 16-way fiber optic probes are distributed in four ring positions on the tube section, the first ring only contains 1-way probes, the second ring consists of 3-way probes, the third ring consists of 6-way probes, and the fourth ring consists of 6 composed of road probes. The probe position of each ring is reasonably placed through the geometric struct...

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Abstract

The invention relates to an imaging measurement method for the gas holdup of the gas-liquid two-phase flow of a single optical fiber array sensor, which includes the following steps: 16 single opticalfiber sensors are placed in a measurement pipeline with a diameter of 20mm, wherein the 16 single optical fiber sensors are distributed in four annular positions of different cross sections of the measurement pipeline; and after the output signals of the 16 single optical fiber sensors are acquired at the same time, original signals are converted into corresponding square wave signals by a self-adjusting double threshold method, the gas holdup is calculated by the square wave signals, the distribution of gas holdup in the cross sections of the pipeline is imaged by using a cubic spline difference algorithm, and the distribution characteristics of gas holdup of the gas-liquid two-phase flow in the cross sections of the pipeline are reconstructed.

Description

technical field [0001] The invention relates to a method for measuring gas holdup distribution of oil well gas-liquid two-phase flow in the field of oilfield dynamic monitoring. Background technique [0002] Gas-liquid two-phase flow exists widely in many fields such as petroleum exploration, power engineering, environmental energy and so on. Bubble flow, slug flow and mixed flow are common flow structures in gas-liquid two-phase flow in oil wells, especially slug flow and mixed flow usually show non-uniform distribution characteristics in the channels of concentrating production logging flow measurement instruments , it is very difficult to accurately measure the gas holdup of gas-liquid two-phase flow. In order to accurately calibrate the gas holdup measuring instrument, it is of great significance to accurately realize the gas holdup measurement of gas-liquid two-phase flow in the laboratory. At the same time, it also provides key gas holdup parameters for the establish...

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Application Information

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IPC IPC(8): G01N21/00
Inventor 金宁德杨秋怡王帆翟路生任英玉
Owner TIANJIN UNIV
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