Test piece of coal seam simulation experiment using shock waves to increase permeability and experiment method based on test piece

A technique for simulating experiments and experimental methods, which is applied in the preparation of test samples, the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, sampling, etc., to achieve the effects of convenient production process, large scale and low cost

Inactive Publication Date: 2016-10-26
SHANXI DATONG UNIV
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Problems solved by technology

[0006] In order to solve the problem of establishing the quantitative relationship between fluctuation parameters and coal rock fracturing effect and permeability change charact

Method used

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  • Test piece of coal seam simulation experiment using shock waves to increase permeability and experiment method based on test piece
  • Test piece of coal seam simulation experiment using shock waves to increase permeability and experiment method based on test piece

Examples

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Embodiment

[0035] Example: The coal samples come from the Lower Permian Shanxi Formation of Chengzhuang Coal Mine and Jianye Coal Mine in Shanxi. The bulk sample was cut into cubes of 15cm×15cm×15cm, and 4 coal bricks were cut out of PM coal rock, WYM coal sample and roof coal sample respectively. After cutting, further grind and flatten each surface of the cube coal block, and clean each surface to remove the coal powder on the surface to ensure the successful pasting of the strain gauges, and all square coal samples The surface is labeled to facilitate the comparison of each surface in subsequent experiments. On the basis of the completion of the above work, the cracks of the coal sample are described. Before the coal samples were further processed, they were sealed in plastic bags to prevent surface oxidation in the air.

[0036] The next step is to paste the strain gauges on the surface of the cube coal block. The surface labeled "6" is the reserved observation surface, and the re...

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Abstract

The invention belongs to the technical field of coal seam physical simulation experiments and particularly relates to a test piece of a coal seam simulation experiment using shock waves to increase permeability and an experiment method based on the test piece. The quantitative relation between fluctuation parameters and the coal petrography cracking effect and permeability variation feature is built through the physical simulation experiment. The test piece comprises a shell, strain bricks and coal sample strain gauges, wherein the shell is a bottom-free rectangular shell, one strain brick is fixed in the middle of each of the faces, except the bottom, on the inner side of the shell, a coal sample is fixed in the shell, and two vertical coal sample strain gauges are fixed in the middle of each of the faces, except the bottom, of the coal sample, every two coal sample strain gauges are respectively fixed in the vertical direction and the horizontal direction, and each strain brick presses on the surfaces of the corresponding two coal sample strain gauges. The test piece has the advantages that the test piece is large in dimension, deformation features can be conveniently recorded during the experiment process, the crack development conditions can be statistically recorded during the experiment process, and cement mortar on the outer surface of the coal sample can simulate surrounding rock.

Description

technical field [0001] The invention belongs to the technical field of coal seam physical simulation experiments, in particular to a test piece of a shock wave enhanced seepage coal seam simulation experiment and an experimental method based on the same. Background technique [0002] my country has abundant coalbed methane resources, and the development and utilization of coalbed methane has great prospects. However, the geological conditions of my country's coalfields are relatively complex, and coal reservoirs mostly have the characteristics of "three lows and one high": low reservoir pressure, low reservoir permeability, low proportion of conventional hydraulic fracturing, and the adsorption capacity of coal reservoirs high. Therefore, the main technical bottleneck restricting the development of coalbed methane is how to improve the permeability of coal seams, including fracturing and removing plugging to increase permeability. [0003] Traditional coalbed methane stimul...

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Application Information

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IPC IPC(8): G01N1/28G01N29/04
CPCG01N1/286G01N29/04G01N2001/2873G01N2291/023
Inventor 赵丽娟段宏飞程虹铭
Owner SHANXI DATONG UNIV
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