Gas extraction method for protected layer

A technology for protected layer and gas drainage, applied in gas discharge, mining equipment, earth-moving drilling, etc., can solve problems such as hidden safety hazards and low efficiency, save construction costs, simplify drilling construction process, and improve drilling The effect of construction efficiency

Pending Publication Date: 2019-03-08
HUAINAN MINING IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method of gas drainage in the protected layer that solves the shortcomings of the construction method in the above-mentioned background technology, such as potential safety hazards and low efficiency.

Method used

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  • Gas extraction method for protected layer
  • Gas extraction method for protected layer
  • Gas extraction method for protected layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as Figure 2-3 As shown, the present invention discloses a method for gas drainage in the protected layer, which includes the following steps:

[0032] (1) Construct the floor roadway 3 on the bottom plate of the protected layer, and construct the layer-penetrating drilling 31 in the floor roadway 3. The layer-penetrating drilling holes 31 can be multiple groups and multiple, and the layer-penetrating drilling holes 31 pass through the protected layer, and Seal the opening of the layer-penetrating hole 31 and reserve the sealing pipe 5, which connects the layer-penetrating hole 31 and the floor roadway 3, so that the gas in the protected layer can enter the floor roadway along the layer-penetrating hole 31 3. Use polyurethane to fix the sealing pipe 5 at the opening of the layer-penetrating drilling hole. The length of the sealing section is 2-4m, and the sealing pipe 5 is a 2-inch PVC pipe, such as a double-resistant solid pipe. To extract the gas from the protec...

Embodiment 2

[0039] The difference between the second embodiment and the first embodiment is that the distance between the pressure relief boreholes of each group is 30 meters.

Embodiment 3

[0041] The difference between the second embodiment and the first embodiment is that the distance between the pressure relief boreholes of each group is 40 meters.

[0042] The 1122(1) and 1123(1) working faces are located in the Dongyi 11-2(2) mining area of ​​Zhangji Mine (Central District), and the corresponding protected layer working faces belong to Dongyi 13-1(2) ) mining area, and the gas content, gas pressure and coal seam elevation are basically similar.

[0043] (1) Implementation effect:

[0044] The protected layer 1122(3) floor roadway corresponding to the 1122(1) working face adopts the traditional drilling sealing, stubble and extraction mode, and the protected layer 1123(3) floor roadway corresponding to the 1123(1) adopts drilling The new technology of "naked sealing" and "naked pumping" in the roadway is now intercepted and compared with the relevant data during the normal recovery period of the 1122(1) and 1123(1) working faces as follows:

[0045] 1122(3)...

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Abstract

The invention discloses a gas extraction method for a protected layer. The gas extraction method comprises the following steps that a bottom plate roadway is constructed at a protected layer bottom plate, a layer-penetrating drilled hole is constructed in the bottom plate roadway and penetrates through the protected layer, a hole-sealing pipe is put into the hole downwards, and gas in the protected layer is extracted; and a gateway of the bottom plate roadway is sealed by a sealing wall, and the gas entering a protecting layer is extracted through a reserved gas extraction pipeline. The gas extraction method has the beneficial effects that gas extraction of the protected layer and the protecting layer is achieved, the drilled hole is temporarily sealed and extracted through the hole-sealing pipe, the situation that the gas in the hole overflows, and consequently, the roadway gas exceeds the limit can be prevented, the problems of limited hole diameter and water accumulation in the pipeline in traditional hole sealing, connecting, extraction processes are effectively solved, and the hidden danger that the road side are pressed, consequently, the pre-embedded extraction pipeline is disconnected, and the pipeline impacts with ironware in the roadway to generate sparks is avoided; and the construction cost of the drilled hole is saved.

Description

technical field [0001] The invention relates to a coal mine gas extraction method, in particular to a gas extraction method for a protected layer. Background technique [0002] The "Regulations on the Prevention and Control of Coal and Gas Outburst" requires that regional outburst prevention measures must be taken before mining outburst coal seams. Protective layer mining technology is a major regional outburst prevention measure, which involves two coal seams, the protective layer and the protected layer. The coal seam that is first mined to eliminate the outburst danger of the adjacent coal seam (protected seam) is called the protective seam; due to the mining effect of the protective seam and the simultaneous extraction of pressure relief gas, the adjacent outburst dangerous coal seam can be transformed into no outburst danger The coal seam, the adjacent protruding dangerous coal seam is called the protected seam. After the protective layer is mined, the protected layer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
CPCE21F7/00
Inventor 汪有清高波杨泽胜潘滔李卫军裴永生
Owner HUAINAN MINING IND GRP
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