Method for treating low air permeability coal seam gas discharge

A coal seam gas and gas permeability technology, which is applied in the field of dealing with low gas permeability coal seam gas emissions, can solve problems such as disaster accidents, large engineering quantities, and hidden safety hazards, and achieve the effects of easy operation, low cost and high safety.

Inactive Publication Date: 2015-10-28
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF6 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas pumping and drainage (gas drainage and gas discharge) are one of the main technical measures to prevent and control gas, but for low-permeability coal seams, the effect of gas pumping and drainage is poor, and the purpose of gas control cannot be achieved
Now commonly used gas anti-reflection technologies mainly include: hydraulic slit enhanced drainage technology, deep hole controlled blasting technology, rotary h

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating low air permeability coal seam gas discharge
  • Method for treating low air permeability coal seam gas discharge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The specific embodiment of the gas discharge method in the coal seam of the present invention includes drilling the coal seam in the coal mining face, using a drilling expansion agent to perform coal seam fracturing, increasing the gas permeability of the coal seam, and discharging gas.

[0015] When statically fracturing rock formations with drilling expansion agents, firstly arrange broken holes on the coal seam according to the free surface and hardness of the coal seam;

[0016] Then select the drilling expansion agent and prepare it according to the characteristics of the drilling expansion agent;

[0017] Afterwards, the prepared drilling expansion agent is poured into the drilling hole, and the coal seam is broken after the drilling expansion agent reacts.

[0018] After the coal seam is broken, the gas can be discharged through free diffusion or negative pressure equipment.

[0019] Specifically, when arranging expansion drills, it is best to follow the followi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Drilling apertureaaaaaaaaaa
Hole depthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for treating low air permeability coal seam gas discharge. According to the method, holes are bored in a coal seam of a coal face, and coal seam fracturing is carried out through a borehole expansion agent to increase the coal seam air permeability for gas discharge. The method comprises the following steps: firstly, forming the boreholes in the coal seam according to the degree of freedom and the hardness of the coal seam; secondly, preparing the borehole expansion agent according to different coal seam temperatures and the characteristics of the borehole expansion agent; thirdly, purging residual coal slag and water in the boreholes in the coal seam to be clean through high-pressure air, and pressing the expansion agent into the boreholes through an extrusion pump or a grout pump to break the coal seam after the reaction of the expansion agent; finally, fracturing the coal seam through the explosion agent to increase the coal seam air permeability, thereby reducing the gas concentration.

Description

technical field [0001] The invention relates to a gas discharge technology, in particular to a method for treating gas discharge from low-permeability coal seams. Background technique [0002] Coal and gas outburst is one of the important causes of accidents in coal mine production process. With the extension of coal mining level, the ground stress increases and the gas pressure rises, resulting in gas accumulation in local areas, the danger of coal and gas outburst is becoming more and more serious, and the difficulty of gas prevention and control is also becoming more and more difficult. Gas pumping and drainage (gas drainage and gas discharge) are one of the main technical measures to prevent and control gas, but for low-permeability coal seams, the effect of gas pumping and drainage is poor, and the purpose of gas control cannot be achieved. Now commonly used gas anti-reflection technologies mainly include: hydraulic slit enhanced drainage technology, deep hole controll...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E21F7/00
Inventor 张嘉勇巩学敏常文杰杨忠东周凤增郭达崔啸
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap