Hydraulic fracturing roof cutting gob-side entry retaining method for thick coal seam

A hydraulic fracturing and thick coal seam technology, applied in the direction of earthwork drilling, discharge machinery, etc., can solve the problems of large consumption of explosives, large construction, dynamic load impact, etc.

Active Publication Date: 2021-06-04
CHINA UNIV OF MINING & TECH
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dense drilling assisted roof cutting requires the construction of a large number of drill holes, and the application in thick coal seams will lead to excessive engineering work and the roof cutting effect cannot be guaranteed

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
  • Hydraulic fracturing roof cutting gob-side entry retaining method for thick coal seam
  • Hydraulic fracturing roof cutting gob-side entry retaining method for thick coal seam
  • Hydraulic fracturing roof cutting gob-side entry retaining method for thick coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] The mining thickness of the thick coal seam working face in the mine is 5.2m, and the average disintegration coefficient of the coal and rock mass is 1.4. The full-height method of one-time mining is adopted, and the recovery rate is 95%. The volume is 0.1m, the width of the roadway is 5.0m, the height is 3.0m, the thickness of the direct roof is 2.3m, and the thickness of the basic roof is 6.8m.

[0031] like Figure 1 to Figure 5 As shown, a thick co...

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

The invention discloses a hydraulic fracturing roof cutting gob-side entry retaining method for a thick coal seam. The method comprises the specific steps of calculating the roof cutting height of the thick coal seam, constructing fracturing drill holes, cutting hole walls through high-pressure jet flow, conducting single-hole multi-time hydraulic fracturing, sequentially fracturing multiple sets of fracturing drill holes, conducting roof cutting entry retaining and taking auxiliary measures. According to the method, the disturbance effect of the hydraulic fracturing technology on a roadway is small, the problems of gas accumulation and harmful gas overrun are relieved, fracturing construction mainly consumes underground industrial water and has little influence on the environment, hydraulic fracturing can be conducted on the multiple sets of fracturing drill holes simultaneously or alternately, the time cost is saved, the excavation and replacement efficiency is improved, and the method can replace the energy gathering blasting technology to achieve safe, efficient and rapid roof cutting entry retaining of thick coal seam mining.

Description

technical field [0001] The invention relates to the technical field of gob-side entry retention with cut roof, in particular to a method for hydraulic fracturing of thick coal seams with cut roof and gob-side entry retention. Background technique [0002] Roof cutting and roadway retention is a technology that preserves the original roadway by pre-treating the roof above the roadway to automatically collapse after mining in the working face. It has been successfully applied and promoted in thin and medium-thick coal seams, but in thick coal seams is still less used. There is no need to leave coal pillars in the roof cutting and retaining roadway, which is beneficial to mine ventilation and elimination of gas accumulation. The main technologies used are dense drilling and concentrated energy blasting roof cutting. Dense drilling assisted roof cutting requires the construction of a large number of drill holes, and the application in thick coal seams will lead to excessive eng...

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): E21C37/12
CPCE21C37/12
Inventor 张飞腾王襄禹柏建彪吴博文王广辉赵嘉鑫孟宁康李冠军
Owner CHINA UNIV OF MINING & TECH
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