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Improved PIV-based horizontal oil-water two-phase flow velocity measurement method

A technology of flow velocity measurement and measurement method, which is applied in image data processing, instrumentation, calculation, etc., can solve the problem of low measurement accuracy and achieve smooth and accurate velocity vector distribution

Inactive Publication Date: 2020-07-03
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low measurement accuracy due to the blank vector and sub-pixel fitting in the PIV algorithm process in the process of measuring the velocity of the horizontal oil-water two-phase flow using PIV technology, and propose a level based on improved PIV Measuring method of oil-water two-phase flow velocity

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  • Improved PIV-based horizontal oil-water two-phase flow velocity measurement method

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Embodiment 1

[0054] A method for measuring the flow velocity of horizontal oil-water two-phase flow based on improved PIV, characterized in that: the method for measuring comprises the following steps:

[0055] Step 1: Process two consecutive frames of images, extract and convert image information into digital information, and determine the query window M in the PIV displacement measurement process;

[0056] The image information extraction conversion is to cut out the useful information of two frames of images, and perform grayscale processing, and the converted two frames of grayscale image functions are represented by f(x, y) and g(x, y) respectively, x and y respectively represent the pixel position coordinates in the horizontal direction and vertical direction in the image;

[0057] The setting of the query window M can improve the resolution and calculation accuracy of the displacement, and M is expressed as

[0058]

[0059] where m 1 ~ m 8 Both are query window sizes for subs...

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Abstract

The invention belongs to the technical field of petroleum engineering and measurement, and particularly relates to an improved PIV-based horizontal oil-water two-phase flow velocity measurement method, which comprises the steps of 1, processing two continuous frames of images, extracting and converting image information into digital information, and determining a query window M in a PIV displacement measurement process; 2, fixing the size of a query window, calculating a cross correlation coefficient of particles in the center of the query window in the two frames of images, and extracting a maximum cross correlation coefficient and a corresponding displacement integer pixel value (p, q); 3, establishing a cross-correlation function R (u, v), and determining a displacement sub-pixel value(u0, v0) of the particle; 4, changing the size of a query window, and interpolating the blank displacement vector to expand the displacement vector distribution; 5, repeating the step 2 to the step 4until the query window circulation is finished, calculating the velocity vector distribution V of the pixel points corresponding to all the displacement vectors, and finally obtaining an average value, namely the average flow velocity of the oil-water two-phase flow at the moment.

Description

Technical field: [0001] The invention belongs to the technical field of petroleum engineering and measurement, in particular to a method for measuring the velocity of a horizontal oil-water two-phase flow based on improved PIV. Background technique: [0002] At present, the development of most oilfields in my country has entered the stage of high water cut and low liquid production. The flow pattern of oil-water two-phase flow is a mixed state of oil-water layer with a small amount of oil bubbles in the upper layer, which easily leads to oil-water slippage. After the implementation of new technologies such as horizontal wells, small pipe diameters, and chemical flooding, the oil-water flow state is greatly affected by this slippage, which brings difficulties to the interpretation of logging data and the evaluation of logging tools in research and development. The interpretation of logging data and the accuracy of logging instruments largely depend on the flow characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/70G06T7/00
CPCG06T7/0002G06T7/70
Inventor 韩连福王海霞付长凤刘超刘兴斌宋鸿梅
Owner NORTHEAST GASOLINEEUM UNIV
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