Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal

A measurement method and permeability technology, applied in the field of coal mine disaster prevention and control

Active Publication Date: 2017-03-22
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] For the defects existing in the above-mentioned prior art, one of the tasks of the present invention is to provide a method for making a raw coal sample, which overcomes the defects in the prior art that raw coal is not easy to form, and

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  • Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal
  • Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal
  • Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with specific embodiments.

[0034] Such as image 3 Shown, the preparation method of raw coal sample of the present invention specifically comprises the following steps:

[0035] A. On-site along the coal mining face, select areas with clear bedding and good integrity for groove sampling. The cubes with a size of 400×400×400mm are sealed and sent to the laboratory. 4 types of coal samples with low porosity are used as experimental coal samples;

[0036] B. The cutting machine is prepared into a cylindrical sample 23 of Φ300×h50mm. The cylindrical surface is divided into two types of samples along the bedding and vertical bedding directions, and the surface is polished. A Φ10mm water injection hole is drilled in the center of the cylinder and installed. The water injection flower tube 20, the two ends of the water injection flower tube 20 and the columnar body sample 23 are sealed by silica gel 24,...

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Abstract

The invention discloses a determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal and belongs to the technical field of coal mine disaster prevention. According to the method, a water injection hole is drilled in the top center of a selected and cut cylindrical sample, a water injection floral tube is mounted in the water injection hole, two ends of the water injection floral tube are sealed, the sample is placed in an annular gas permeating cylinder, cement is poured on a base of the annular gas permeating cylinder, a gas permeable tube is arranged between the inner wall of the annular gas permeating cylinder and the cylindrical sample, cement is poured into the gap formed between the cylinder wall and the cylindrical sample, a platen is arranged at the top of the cylindrical sample, after the cement in the annular gas permeating cylinder is set, a support rod is taken out, and a raw coal sample is obtained; then the raw coal sample is placed in an experiment tank, and the permeability of the high-pressure water invasion gas-containing raw coal sample is finally calculated through cooperation of a pressure loading system, a high-pressure water injection system and the like which are connected with the experiment tank. The method provides scientific instruction for prevention of coal mine disasters with the coal seam water injection technology.

Description

technical field [0001] The invention belongs to the technical field of coal mine disaster prevention and control, in particular to a high-pressure water injection and radial gas seepage experimental method, in particular to a high-pressure water injection of raw coal containing gas and a method for measuring radial gas permeability. Background technique [0002] In recent years, with the increase of coal mining depth, disasters such as gas, fire, dust and water have become more and more serious during the mining process. pressure) governance. At present, it is very difficult to carry out theoretical research on coal seam water injection through field experiments, and laboratory experiments are needed to simulate the dynamic process of coal seam water injection under real conditions. Therefore, most of the coal samples used in experiments are molded coal samples, even if the raw coal samples are used, most of them are gas or water one-way seepage experiments, and the raw coa...

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Application Information

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IPC IPC(8): G01N1/28G01N15/08
Inventor 刘震程卫民杨赫王刚辛林倪冠华
Owner SHANDONG UNIV OF SCI & TECH
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