Acidification outburst elimination effect evaluation method

A coal seam and dissolution technology, applied in the direction of earthwork drilling, wellbore/well components, instruments, etc., can solve problems such as coal material degradation, coal and gas outburst, and achieve the effect of ensuring authenticity and objectivity

Active Publication Date: 2021-04-09
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Different from conventional hydraulic measures, after the coal body is acidified, the strength of gas desorption coal body is increased to a certain extent, but at the same time, the acidification effect makes the coal material relatively deteriorated. Compared with ordinary hydraulic measures, it is more likely to produce coal and gas. Therefore, the judging criteria based solely on residual gas content, pressure, etc. are no longer suitable for acidification anti-outburst measures, and cannot be well applied to coal and gas outburst judgments after acidification measures

Method used

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  • Acidification outburst elimination effect evaluation method
  • Acidification outburst elimination effect evaluation method
  • Acidification outburst elimination effect evaluation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] see figure 1 , the present embodiment provides a method for judging the effect of acidification and detoxification, comprising the following steps:

[0032] 1) Measure and sample the in-situ stress value of coal seam 1 in the area to be gas controlled by using the hollow inclusion borehole stress relief method. The elastic modulus test is carried out to determine the elastic modulus and Poisson's ratio parameters of the coal sample.

[0033] 2) Use X-ray diffraction and fluorescence spectroscopy to find out the types of erodible minerals that can react with acid in coal samples, and use the calibration method to determine the content of various erodible minerals. Wherein, the erodible minerals include carbonate rocks, silicate rocks and sulfides.

[0034] 3) Implement acidification and anti-permeability measures, and use the deep base point method to measure the expansion deformation δ of coal seam 1.

[0035] 3.1) Acidizing borehole 2 and coal expansion and deformat...

Embodiment 2

[0046] The main steps of this embodiment are the same as those in Embodiment 1. see figure 2 , Outburst elimination in this embodiment is the acidification of the upper coal seam. Acidizing borehole 2 is a layer-crossing borehole constructed in the drainage drill field.

Embodiment 3

[0048] The main steps of this embodiment are the same as those in Embodiment 1. see image 3 , The work of eliminating outbursts in this embodiment is acidification and outburst elimination in this coal seam. Acidizing drilling 2 is to drill down along the coal seam inclination on the side of the roadway along the return air channel before mining at the working face, and to drill down along the inclination of the coal seam on the side of the roadway along the transport channel.

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Abstract

The invention provides an acidification outburst elimination effect evaluation method. The acidification outburst elimination effect evaluation method comprises the steps that a crustal stress value is measured; soluble minerals in a coal sample are found out; an acidification anti-reflection measure is implemented; the expansion deformation of a coal seam is measured; the average thickness of the soluble minerals of the coal body under the acidification effect is calculated; the acidification anti-reflection measure is judged and the like. The acidification outburst elimination effect evaluation method can be used for accurately estimating whether the coal body subjected to acidification is subjected to outburst elimination or not and determining the acidification pressure relief outburst elimination range. A basis is provided for accurate determination of an acidification outburst prevention range, authenticity and objectivity of outburst elimination of an outburst coal seam by acidification are basically guaranteed, a relatively real outburst-risk-free range can be obtained, and a powerful guarantee is provided for safe mining of a coal mine.

Description

technical field [0001] The invention relates to the field of mine engineering, in particular to a method for eliminating the danger of coal and gas outburst through acidification. Background technique [0002] In the process of coal and gas outburst control, how to reduce the ground stress, increase the permeability, and improve the effect of gas drainage is the key to the prevention and control of coal and gas outburst. The Carboniferous-Permian coal seam is currently the main mining coal seam in my country. About 70% of coal and gas outbursts occurred in the Carboniferous-Permian Period, and calcite generally developed in the Carboniferous-Permian Period. The soluble minerals dissolved in the acid form a new fracture space, the coal body expands and deforms, the ground stress decreases, the permeability increases, and the gas desorption and migration can effectively reduce or eliminate the outburst risk of coal. [0003] The hypothesis of the comprehensive action of coal a...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21F7/00E21B49/00G01N23/207G01N23/223G01N23/2206
CPCE21B43/26E21F7/00E21B49/00G01N23/2076G01N23/223G01N23/2206
Inventor 梁运培张碧川冉启灿陈建杰邹全乐黄旭超王庆慧
Owner CHONGQING UNIV
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