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

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

Active Publication Date: 2021-09-24
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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  • A similar simulation method and device for coal seam water injection sealing hole test
  • A similar simulation method and device for coal seam water injection sealing hole test
  • A similar simulation method and device for coal seam water injection sealing hole test

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A similar simulation method for a coal seam water injection sealing hole test, comprising the following steps:

[0058] 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.

[0059]

[0060] Among them, P 0 , P are the similar model and the actual water injection pressure on site, unit MPa;

[0061] σ 0 , σ are similar model and field actual confining pressure stress, unit MPa;

[0062] D. 0 , D are the similar model and the actual drilling diameter on site, unit mm;

[0063] L 0 , L are the length of the similar model and the actual sealing hole on site, unit mm;

[0064] 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 affectin...

Embodiment 2

[0116] see Figure 2 to Figure 7 , a similar simulation device for coal seam water injection sealing hole test, comprising a coal molding pressing device and a water injection system, the molding coal pressing device includes a mold box 11, a peripheral support box 3, a transfer beam 13 and embedded in a coal molding sample 1 The water injection pipe, the water injection pipe is used to form the water injection hole 10 of the briquette sample 1;

[0117] Both ends of the mold box 11 are provided with avoidance holes for water injection pipes, and the escape holes are waist-shaped holes; the top 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 communicates with the surrounding pressure through the transfer beam 13 The pressurizing device 2 is connected; the peripheral support box 3 has a cavity matching the circumference of the mold box 11, and the mold box 11 is located in the cavity of the peripheral suppo...

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Abstract

The invention relates to a similar simulation method and device for a coal seam water injection sealing hole test, which belongs to the technical field of coal seam water injection. The similar simulation method for the coal seam water injection sealing hole test includes the following steps: S1 Determine the experimental parameters: build a water injection sealing hole force model, and obtain Simulate the similarity ratio; determine the experimental parameters and coal sample size specifications according to the on-site coal seam thickness and the parameters that affect the similarity ratio; S2 make small coal samples and large coal samples; S3 conduct similar sealing tests to obtain the actual water injection pressure ; S4 According to the simulated similarity ratio and the actual water injection pressure, invert the actual sealing pressure bearing capacity on site. The present invention inverts the actual sealing pressure bearing capacity on site through similar hole sealing experiments, and solves the problem that the sealing cannot be accurately corrected according to the on-site water injection pressure.

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 sealing hole 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 endangers 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 coal mine mining intensity, the intensity of dust production in the working face is increasing. According to the field measurement 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 control measures, and one of the key factors affecting the effect of coal seam water injection is the quality of sealing holes. [0005] The commonly used sealin...

Claims

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Application Information

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Patent Type & Authority Patents(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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