Method for gas drainage from high-position roadway coal seam containing shielded soft rock

A coal seam gas and high-level technology, which is applied in the field of coal mining, can solve the problem of unsatisfactory gas drainage effect with shielded soft rock, and achieve good drainage effect and easy drainage

Inactive Publication Date: 2012-08-15
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of this invention is to propose a construction method with an ideal drainage effect in view of the current situation that the gas drainage effect of shielding soft rock is not ideal

Method used

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  • Method for gas drainage from high-position roadway coal seam containing shielded soft rock
  • Method for gas drainage from high-position roadway coal seam containing shielded soft rock
  • Method for gas drainage from high-position roadway coal seam containing shielded soft rock

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Embodiment Construction

[0021] A coal seam gas drainage method with shielding soft rock, the steps are as follows:

[0022] The first step: construction of high lane

[0023] Before the coal seam is mined, the roadway is developed in the hard rock layer of the coal seam roof. Because it is designed on the top of the coal seam, it is called the high-level roadway. The developed roadway must ensure the stability of the surrounding rock and strengthen the temporary support. The layout of the high-level roadway is as follows figure 1 shown;

[0024] Step 2: Conventional Drilling and Drainage

[0025] During the mining of the working face, first of all, conventional drilling is drilled into the coal seam in the service roadway of the working face for preliminary gas drainage. The drilling layout is as follows: figure 1 shown;

[0026] Step 3: While initially draining the gas, drill holes into the coal seam in the high-level roadway on the roof. When drilling, a self-drilling drill pipe with a hollow st...

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Abstract

The invention discloses a method for gas drainage from a high-position roadway coal seam containing shielded soft rock. According to the method, before the coal seam is mined, a roadway is developed in a hard rock formation of the coal seam roof and is called a high-position roadway for short as being designed at the coal seam roof part. The well-developed roadway can be used for ensuring the stability of surrounding rock and enhancing the temporary support; then during the working surface mining, holes are drilled in the coal seam in the roadway of a working surface, and preliminary gas drainage is carried out; and finally, at the same time of the preliminary gas drainage, holes are drilled in the coal seam in the high-position roadway, self-drilling drill rods with a hollow structure are adopted in the drilling, small holes are processed in the sections where the self-drilling drill rods enter the coal seam, the self-drilling drill rods are kept in the drilling holes of the coal seam after drilling in the coal seam, and the gas drainage can be continuously carried out through the self-drilling drill rods. According to the method, the drainage is carried out in the high-position roadway, the characteristic of upward flow of gas is fit, and thus the drainage is convenient to realize. The hollow drill rods with holes are used for the drainage, the drilling holes can be prevented from being sealed by the shielded soft rock and further a good drainage effect is realized.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] Co-mining of coal and gas is one of the new topics in coal mining. [0003] At present, gas drainage is mainly carried out by drilling ordinary boreholes in the service roadway of the coal seam. In gas drainage, as the mining depth increases, the effect of gas drainage is closely related to rock structure and lithology. At present, the coal seam gas drainage effect on the soft rock roof is not good, mainly because the cracks in the soft rock layer are easy to close and have a shielding effect, and no effective gas drainage method has been found for the coal seam containing soft rock. [0004] Therefore, it is necessary to invent an effective drainage method for gas drainage under the conditions of multi-structure, large buried depth and soft rock formation. Contents of the invention [0005] The purpose of the invention is to propose a construction method wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
Inventor 潘立友
Owner SHANDONG UNIV OF SCI & TECH
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