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Method for measuring phase fractions of oil-water two-phase flows based on ultrasonic attenuation mechanism model

A technology of attenuation mechanism and measurement method, applied in the direction of measuring device, material analysis using sound wave/ultrasonic wave/infrasonic wave, instrument, etc., can solve problems such as ultrasonic sensor nonlinearity, achieve disturbance of flow field, avoid nonlinear response, reduce non-linear The effect of linearity

Active Publication Date: 2016-12-14
TIANJIN UNIV
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Problems solved by technology

However, when the discrete phase holdup is very low, the ultrasonic sensor has a corresponding nonlinear problem.

Method used

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  • Method for measuring phase fractions of oil-water two-phase flows based on ultrasonic attenuation mechanism model
  • Method for measuring phase fractions of oil-water two-phase flows based on ultrasonic attenuation mechanism model
  • Method for measuring phase fractions of oil-water two-phase flows based on ultrasonic attenuation mechanism model

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Embodiment Construction

[0023] The following detailed description of the steps of manufacturing and operating the present invention is intended to be described as an embodiment of the present invention, and is not the only form that can be manufactured or utilized. Other embodiments that can achieve the same function should also be included within the scope of the present invention .

[0024] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the ultrasonic transmitting end sends out ultrasonic waves of a certain frequency and intensity, and after the attenuation mechanism such as the absorption of oil and water two phases, it reaches the ultrasonic signal receiving end. Because oil bubbles of different sizes absorb different degrees of ultrasonic waves, the degrees of ultrasonic attenuation obtained at the receiving end are also different. According to the relationship between the size ...

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Abstract

The invention relates to a method for measuring the phase fractions of oil-water two-phase flows based on an ultrasonic attenuation mechanism model. According to the method, one main receiving sensor and six auxiliary ultrasonic receiving sensors are adopted. The method comprises the following steps: setting a detection signal of the main receiving sensor as V2, respectively setting detection signals of the six auxiliary ultrasonic receiving sensors as V3......V8, and calculating the ultrasonic intensity attenuation of the detection signals V2, V3......V8 and a drive signal V1; calculating the sum of a total ultrasonic attenuation coefficient of an oil-water two-phase-flow fluid and the ultrasonic diffusion attenuation amount of each auxiliary ultrasonic receiving sensor; detecting transit time from a time point when the drive signal is emitted by a signal emitting sensor to a time point when the signal is received by the main receiving sensor; calculating an oil-water two-phase scattering parameter; and calculating each phase fraction of the oil-water two-phase flows. By virtue of the method, the estimation precision of the moisture content can be increased.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and relates to a measurement method based on an ultrasonic sound intensity attenuation mechanism, which is used for non-contact measurement of phase holdup of oil-water two-phase flow. technical background [0002] Multiphase flow phenomena widely exist in nature and industrial production processes such as power, petroleum, chemical, metallurgy, and aerospace. For example, in the petroleum industry, the fluids in oil wells often exist in the form of oil, gas, and water; in the process of generating electricity in power plants, the pulverized coal used as fuel exists in gas and solid phases during the transportation process. The most common multiphase flow phenomenon in oil production is oil-water two-phase flow. With the rapid development of modern industrial production, the expansion of the scale of the production process and the complexity of the process, the requirements for the mea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/032
CPCG01N29/032G01N2291/015G01N2291/0222
Inventor 谭超苏茜董峰
Owner TIANJIN UNIV
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