Method for extracting protruded coal-bed downward bedding long-borehole step-by-step covering area gas

A technology for gas drainage and outburst coal seam, which is applied in gas discharge, earthwork drilling, mining equipment, etc., and can solve the problems of high cost and long construction period.

Inactive Publication Date: 2007-09-05
淮北矿业股份有限公司祁南煤矿 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to relevant national regulations, gas drainage should be carried out before the mining of outburst coal seams. The commonly used regional gas drainage methods

Method used

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Examples

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Effect test

Embodiment Construction

[0017] The regional gas drainage method of the present invention is to progressively cover the long boreholes in the outburst coal seam to the bedding:

[0018] Set process parameters: drill holes are arranged in parallel along the coal seam inclination, with a distance of 2 to 5m and a diameter of 90mm. The distance is not less than 10m; the length of the borehole sealing is not less than 10m, the diameter of the sealing pipe is 40mm, and the borehole is connected to the drainage pipeline through the confluence pipe. The waist lane is a special roadway for gas control in the working face, which is arranged in the middle of the working face along the direction, and the cross-section is designed to be 5-8m 2 ;Ensure that the negative pressure at the bore hole is not less than 15kPa, and the pre-pumping time is not less than 3 months.

[0019] Drilling construction in the upper half of the area: From the machine roadway construction in the upper section of the working face to t...

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Abstract

This is a gas extraction method for a single burst coal bed of stable coal occurrence, angle less than 10o, and firm index over 0.5. Drill a hole from top working face downward along the coal bed from shallow bed to deep, from low gas concentration zone to high for pre-extraction to lower down the gas concentration.

Description

technical field [0001] The invention relates to a regional gas drainage method for progressively covering long boreholes under an outburst coal seam, especially suitable for regional gas drainage of a single outburst coal seam with stable coal seam occurrence, dip angle less than 10°, and firmness coefficient greater than 0.5 . Background technique [0002] As the mining depth of coal seams increases, the gas pressure and gas content of coal seams increase, and some coal seams transform into outburst coal seams. According to relevant national regulations, gas drainage should be carried out before the mining of outburst coal seams. The commonly used regional gas drainage methods include mining of protective layers and pre-draining of coal seams in floor rock roadways, but these two drainage methods have long construction periods and high costs. . Contents of the invention [0003] In view of the problems existing in ...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B33/00
Inventor 沐俊卫程远平沈永铜王庆永王海锋沈怀津
Owner 淮北矿业股份有限公司祁南煤矿
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