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Method for extracting pressure relief gas by retained roadway drill site drilling

A drilling and drainage technology, applied in the field of coal mine gas drainage, can solve the problems of no working space, prone to collapse holes, and great influence on gas drainage effect.

Inactive Publication Date: 2013-10-23
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method of extracting and releasing pressure gas can reduce the amount of roadway excavation and save a lot of excavation costs, the selection of the location of the drill holes has a great influence on the effect of gas extraction
[0005] There are two outstanding problems in the arrangement of boreholes for gas drainage in the retaining roadway: 1. The gas drainage boreholes are constructed ahead of the working face in the retaining roadway, which is prone to hole collapse
2. The construction of gas drainage drilling at the working face lags behind the roadway, and there is not enough work space

Method used

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  • Method for extracting pressure relief gas by retained roadway drill site drilling
  • Method for extracting pressure relief gas by retained roadway drill site drilling

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Embodiment Construction

[0017] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0018] The operation steps of the method for extracting pressure-relieving gas by the drilling method of retaining roadway drilling field of the present invention:

[0019] a. Multiple drill sites 4 are constructed at intervals on one side of the solid coal 3 in the entryway 2 at 20-50m behind the coal mining face 1, and the drill sites 4 are supported to provide work space for the construction of the drainage borehole 5 The distance between the plurality of drilling sites 4 of the interval construction is 50-100m, the span of the drilling site 4 is 2-3m, the length is 4-5m, and the height is equal to the roadway height;

[0020] b. Multiple gas drainage boreholes 5 are constructed on the roof of the goaf 6 in the drilling site 4. The final hole position of the drainage borehole 5 is 10-40m horizontally away from the entryway 2, and the normal distance from...

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Abstract

The invention discloses a method for extracting pressure relief gas by retained roadway drill site drilling, aiming at solving the problem that gas extraction drilling cannot be constructed since hole collapse occurs easily during gas extraction drilling in construction of an advance coal face of a retained roadway along a goaf of a deep well and the section of a retained roadway of a lag coal face shrinks seriously. The method comprises the following steps: constructing drill sites on one side of solid coal of a lag coal face in a retained roadway to provide an operation space for constructing extraction drilling; constructing extraction drilling in the drill sites towards a fissured zone of the roof of the goaf; and finally sealing extraction drilled holes and performing gas extraction after connecting an extraction pipeline. According to the method, the technical problems that hole collapse occurs easily during gas extraction drilling of the advance coal face and the extraction drilling of the lag working face is difficult to construct are solved, the operation space is provided for the gas extraction drilling construction, and smooth implementation of gas extraction is guaranteed.

Description

technical field [0001] The invention relates to the technical field of gas drainage in coal mines, in particular to a method suitable for drilling pressure-relieving gas in a drilling field for retaining lanes. Background technique [0002] Gas exists mainly in the state of adsorption in the coal body, and the original coal seam has generally low gas permeability, so the effect of direct extraction of gas from the original coal seam is very poor. However, after the coal seam is affected by mining, the coal seam will undergo pressure relief and expansion, and the gas permeability will increase. The gas in the coal seam is converted from the adsorption state to the free state, and the extraction effect is good. [0003] Aiming at the technical problems of high gas, high ground pressure, and low permeability in the mining of coal seam groups, academician Yuan Liang proposed a new idea of ​​coal and gas co-mining technology: the first mining of key pressure relief layers, and ra...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 阚甲广张农王彬其他发明人请求不公开姓名
Owner CHINA UNIV OF MINING & TECH
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