Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Coal Permeability Enhancement Method of Inner Cutting and Explosion Coupling in Borehole

An in-drilling, coupled technology, applied in the direction of mining fluid, earthwork drilling, gas discharge, etc., can solve the problem of limited effective range of influence of a single slotted borehole, and achieve the expansion of the range of effective pressure relief. The method is simple and Effect of reducing gas adsorption potential

Active Publication Date: 2016-08-24
CHINA UNIV OF MINING & TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, hydraulic slotting has been widely used in coal seam enhancement and anti-reflection in coal mines, but the effective influence range of a single slotted drilling is still limited

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
  • A Coal Permeability Enhancement Method of Inner Cutting and Explosion Coupling in Borehole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0020] The drilling internal cutting-explosion coupling type coal body anti-reflection method of the present invention, the specific steps are as follows:

[0021] a. In the coal seam, the holes of drainage drilling and percussion drilling are staggered to ensure that the drainage drilling is within the influence range of percussion drilling;

[0022] b. Use ordinary drill bits to drill into the drainage borehole until it completely penetrates the coal seam, and after sealing the hole, connect it to the gas drainage pipe network for gas drainage;

[0023] c. Use the integrated drilling and cutting drill bit to drill into the percussion drilling hole to 1m above the coal seam roof, back off the drill, and perform hydraulic cutting on the coal seam in the drill hole;

[0024] d. After withdrawing from the drill pipe, the air extraction pipe 10 and the im...

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

No PUM Login to View More

Abstract

Provided is a cutting-exploding coupled coal anti-reflection method in a drilled hole. A large number of effective seam grooves are formed in a coal seam through a hydraulic cutting seam technology, and therefore effective decompression can be performed on coal within a certain range, and methane gas desorption seepage is promoted. Through a sucking pump, methane gas in the drilled hole is pumped into a closed explosive vessel arranged outside the drilled hole. High-pressure and high-temperature mixed methane gas with the concentration being 9.5% to 10.5% can be formed in the explosive vessel. The mixed gas is detonated through an igniting device, high-energy gas is formed, the drilled hole is impacted under guiding of a guiding pipe, and the coal further fractures on the basis of original seam grooves. Initial explosion temperature, initial pressure and igniting energy are reasonably selected according to the coal bed condition, optimal explosive capacity is formed in the explosive vessel, fracture network expansion is fully promoted, methane gas adsorption potential can be remarkably reduced, methane gas desorption is promoted, and the purpose of intensifying methane gas extraction is achieved. The method is simple, safe, reliable, low in cost and easy to operate, and time and labor are saved.

Description

technical field [0001] The invention relates to an internal cutting-explosion coupling type coal permeability increasing method, which is especially suitable for high-efficiency gas extraction of high-gas and low-permeability coal seams in underground coal mines. Background technique [0002] The fundamental means of underground gas control in my country's coal mines is gas drainage measures based on borehole gas drainage. As my country's coal mines enter deep mining, the low permeability of coal seams has gradually become the main controlling factor restricting the efficient extraction of gas. Therefore, enhanced anti-reflection technology has become a key technology to improve the effect of gas drainage and realize the joint mining of deep coal and gas. Explosion shock wave damaged coal body enhanced drainage method is one of the effective measures proved by practice in recent years. It mainly relies on installing explosives inside the coal seam, and uses the shock wave ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
CPCE21B43/26E21F7/00
Inventor 林柏泉洪溢都朱传杰姚昊邹全乐郭畅
Owner CHINA UNIV OF MINING & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com