Analog simulation method and device for coal seam water injection hole sealing test

A coal seam water injection and similar simulation technology, which is applied to measuring devices, fuel oil testing, material inspection products, etc., can solve problems such as inability to seal and correct accurately, and achieve the effect of improving water injection efficiency and reducing work difficulty

Active Publication Date: 2020-01-03
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of this application is to provide a similar simulation method and device for the coal seam water injection sealing test. Through similar sealing experiments, the actual sealing pressure bearing capacity of the site can be inverted, and the sealing can not be performed according to the on-site water injection pressure. corrected problem

Method used

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  • Analog simulation method and device for coal seam water injection hole sealing test
  • Analog simulation method and device for coal seam water injection hole sealing test
  • Analog simulation method and device for coal seam water injection hole sealing test

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A similar simulation method for a coal seam water injection sealing hole test, comprising the following steps:

[0057] S1 Determining the experimental parameters: According to the force characteristics of water injection sealing holes, the force model of water injection sealing holes is established, and the simulated similarity ratio is obtained.

[0058] Among them, P 0 , P are the similar model and the actual water injection pressure on site, unit MPa;

[0059] σ 0 , σ are similar model and field actual confining pressure stress, unit MPa;

[0060] D. 0 , D are the similar model and the actual drilling diameter on site, unit mm;

[0061] L 0 , L are the length of the similar model and the actual sealing hole on site, unit mm;

[0062] According to the thickness of the coal seam on site and the parameters affecting the similarity ratio, the experimental parameters and coal sample size specifications are determined. Among them, the parameters affecting the simi...

Embodiment 2

[0114] see Figure 2 to Figure 7 , a similar simulation device for coal seam water injection and hole sealing test, including a briquette pressing device and a water injection system, the briquette pressing device includes a mold box 11, a peripheral support box 3, a transfer beam 13, and is embedded in the briquette sample 1. The water injection pipe is used to form the water injection hole 10 of the briquette sample 1;

[0115] Both ends of the mold box 11 are provided with avoidance holes for water injection pipes, and the avoidance holes are waist-shaped holes; the top end of the mold box 11 is open, and the transfer beam 13 is arranged at the opening of the mold box 11, and the mold box 11 passes through the transfer beam 13 and the confining pressure. The pressurizing device 2 is connected; the peripheral support box 3 has a cavity matched with the circumference of the mold box 11, and the mold box 11 is located in the cavity of the peripheral support box 3;

[0116] Th...

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Abstract

The invention relates to an analog simulation method and an analog simulation device for a coal seam water injection hole sealing test, which belong to the technical field of coal seam water injection. The analog simulation method for the coal seam water injection hole sealing test comprises the steps of: S1, determining experimental parameters, namely, establishing a water injection hole sealingstress model to obtain a simulation similarity ratio, and determining the experimental parameters and coal sample size specifications according to the field coal seam thickness and parameters influencing the similarity ratio; S2, manufacturing briquette coal small samples and briquette coal large samples; S3, performing an analog hole sealing test to obtain actual water injection pressure; S4, andinverting actual hole sealing pressure bearing capacity on the site according to the simulation similarity ratio and the actual water injection pressure. The analog simulation method and the analog simulation device invert the actual hole sealing pressure bearing capacity on the site through conducting the analog hole sealing test, and solve the problem that a seal cannot be precisely corrected according to the water injection pressure on the site.

Description

technical field [0001] The invention belongs to the technical field of coal seam water injection, and relates to a similar simulation method and device for a coal seam water injection hole sealing test. Background technique [0002] Dust hazard has always been the focus of prevention and control in the process of coal mining, which not only seriously harms the physical and mental health of coal miners, but also has a great impact on the safety of coal mine production. [0003] With the continuous improvement of the mining intensity of coal mines, the dust production intensity of the working face continues to increase. According to the field measured data, the dust concentration of the fully mechanized mining face can reach up to 3000mg / m3. [0004] Coal seam water injection is one of the most effective comprehensive dust prevention measures, and one of the key factors affecting the effect of coal seam water injection is the quality of hole sealing. [0005] The commonly use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
CPCG01N33/222
Inventor 陈芳李德文张设计胥奎马威袁地镜吴国友黎志杨俊磊杨桐庄学安冉川莫金明邹常富
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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