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Method for quantitatively representing coal three-dimensional open-closed hole structure

A technology of closed-cell structure and quantitative characterization, which is applied in the direction of measurement devices, test sample preparation, permeability/surface area analysis, etc., can solve the problems of inability to accurately reflect the gas migration path, and achieve the effect of a simple and fast experimental measurement method

Active Publication Date: 2017-09-22
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] However, the above methods can only give quantitative and qualitative characterization of two-dimensional images.
Coal is an anisotropic porous medium, and only one two-dimensional image cannot accurately reflect the gas migration path

Method used

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  • Method for quantitatively representing coal three-dimensional open-closed hole structure
  • Method for quantitatively representing coal three-dimensional open-closed hole structure
  • Method for quantitatively representing coal three-dimensional open-closed hole structure

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Embodiment

[0039] Such as figure 1 As shown, a three-dimensional quantitative characterization method of coal open and closed pore structure includes the following steps:

[0040] Step 1: Preparation of coal samples: First of all, take samples, get large samples on site, prepare sampling bags, shovels, labels, recording pens and gloves, put on safety helmets, and put on gloves to take the sample bags, shovels, and labels. The stock yard is ready to take samples, and the lead seals on both sides of the vehicles in the stock yard are inspected. If they are complete, the coal particle size and moisture content are qualified, and then the samples are taken. The second is to prepare the coal samples that meet the standards, and then prepare the coal samples: use the SD66 precision laser die cutting machine to prepare the collected raw coal into cubes of 5mm×5mm×5mm, and use sandpaper to smooth them. Before the sample preparation, the sub-sample plate was prepared and cleaned, and after the s...

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Abstract

The invention discloses a method for quantitatively representing a coal three-dimensional open-closed hole structure, which reasonably combines a sequence slice method and high-resolution scanning electron microscope method and combines an IPP image analysis method and an MATLAB to obtain a quantified coal sample three-dimensional pore structure so as to actually reflect a length, a shape, an equivalent aperture, a specific area, a specific capacity, a number of opened and closed pores and porosity of opened-closed pores of pores of a coal sample. The method comprises the following steps: step I: extracting raw coal, preparing a coal sample, and adhering the prepared coal sample by utilizing collodion; step II: drying, and performing sequence slicing for the coal sample by utilizing a cutting machine; step III: obtaining a two-dimensional picture of the coal sample by combining a sequence slice combination method and a high-resolution scanning electron microscope method; step IV: quantitatively scanning the obtained slicing scanned picture by utilizing image analysis software and a binary method, and outputting an excel file; and step V: performing MATLAB processing, and obtaining various coal sample pore structure parameters.

Description

technical field [0001] The invention relates to a method for quantitatively characterizing the three-dimensional opening and closing pore structure of coal, which belongs to the field of coal bed gas geology. Background technique [0002] Coal is a porous medium with characteristics such as large specific surface area and spontaneous gas adsorption. As a kind of porous medium, coal pore surface is the place where gas gas exists. The pore structure of coal is extremely complex, and its pore size and distribution directly affect the migration of gas in it. Therefore, the study of coal pore structure has important guiding significance for the extraction of coalbed methane. [0003] Coal pore structure refers to the size, shape, development degree and intercombination relationship of pores contained in coal reservoirs. So far, the commonly used porosity determination methods include mercury porosimetry, low-temperature liquid nitrogen adsorption method and CO 2 The adsorption...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N1/32G01N1/06
CPCG01N1/06G01N1/32G01N15/088
Inventor 姜海纳王鹏昊徐乐华冯国瑞胡胜勇李振高强崔家庆宋诚
Owner TAIYUAN UNIV OF TECH
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