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Contact angle acquisition method of gas-liquid two-phase dynamic displacement images in micron capillary tubes

An acquisition method and capillary technology, which are applied in image enhancement, image analysis, image data processing, etc., can solve the problem of inability to measure the number of capillaries, and achieve the effects of simple programming, strong fault tolerance, and stable measurement results.

Active Publication Date: 2019-01-04
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] But adopt above-mentioned two kinds of schemes all can't measure capillary number 10 -10 -5 and Bond number Bo-4 Dynamic contact angle under working conditions

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  • Contact angle acquisition method of gas-liquid two-phase dynamic displacement images in micron capillary tubes
  • Contact angle acquisition method of gas-liquid two-phase dynamic displacement images in micron capillary tubes
  • Contact angle acquisition method of gas-liquid two-phase dynamic displacement images in micron capillary tubes

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Embodiment Construction

[0055] like figure 1 As shown, the method for obtaining the contact angle of the gas-liquid two-phase dynamic displacement image in a micron capillary according to an embodiment of the present invention includes the following steps:

[0056] Step 100, using a microscope to obtain an image of the current gas-liquid two-phase dynamic displacement process in the micron capillary, and sending it to the control system, the control system performs grayscale conversion and filtering processing on the image, and then uses the threshold segmentation algorithm to convert the grayscale image to into a binary image, and use the connected region method to extract the boundary coordinate points that constitute the pipeline-shaped boundary image through the color of the pixel points;

[0057] White in the image corresponds to a grayscale value of 255, black corresponds to 0, and the grayscale values ​​of the rest of the different degrees of gray are between 0 and 255. The filtering process ...

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Abstract

The invention provides a method for acquiring a contact angle of gas-liquid two-phase dynamic displacement images in micron capillary tubes. The images of gas-liquid two-phase dynamic displacement process in micron capillary tubes are obtained by microscope and then transformed into binary images. The boundary coordinate points of the image were extracted by using the connected region method through the color of pixels. The distribution trend of coordinate points of the phase interface and the two wall surfaces is initially determined, and then the coordinate points of the phase interface andthe two wall surfaces are initially divided. After the cubic polynomial fitting of the coordinate points of the phase interface, the cubic function is obtained, and the first-order function fitting ofthe coordinate points of the two walls is performed to obtain two corresponding expressions, and the exact coordinates of the two end points of the phase interface can be obtained after the solution,that is, the contact angles of the two end points of the phase interface can be obtained. The invention has the advantages of strong robustness, stable measurement results, strong fault tolerance andaccurate measurement results for images with poor quality.

Description

technical field [0001] The invention relates to the field of geology, in particular to a contact angle acquisition method of a gas-liquid two-phase dynamic displacement image in a micron capillary. Background technique [0002] The mechanism of two-phase displacement in a single micron-scale capillary is the basis of two-phase displacement in porous media in natural environments. Two-phase displacement in porous media occurs in many industrial or natural processes, such as water in tight oil reservoirs. Gas drive, solution gas drive, water drive and other processes, the above-mentioned industrial processes are characterized by weak viscous force (the range of capillary number is 10 -10 <Ca<10 -5 ), weak gravity (Bond number B o less than 10 -4 ). The key factor affecting the displacement process is the capillary force, and the key parameter to calculate the capillary force is the contact angle between the two-phase interface and the pipe wall. The capillary force ...

Claims

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Application Information

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IPC IPC(8): G06T7/73G06T7/13G06T7/11G06T7/136G06T7/187
CPCG06T2207/10056G06T2207/30184G06T7/11G06T7/13G06T7/136G06T7/187G06T7/73
Inventor 雷达林缅江文滨曹高辉徐志朋李曹雄姬莉莉
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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