Underground coal mine drilling, heat injection and hole sealing integration method

A technology of sealing holes and injecting heat, which is applied in mining fluids, mining equipment, earthwork drilling, etc. It can solve the problems of low concentration of drilling gas drainage, failure to realize recycling, and hidden dangers of coal seam safety, so as to reduce heat loss, Wide applicability and effect of reducing heat injection cost

Active Publication Date: 2015-05-13
CHINA UNIV OF MINING & TECH
View PDF8 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the steel heat injection pipes used in coal seam heat injection to enhance gas drainage are basically unable to be recycled, resulting in high heat injection costs and burying safety hazards for later coal seam recovery
In addition, the serious gas leakage in the cracks of the borehole wall currently leads to the low concentration of borehole gas extraction, and even leads to the spontaneous combustion of coal in the borehole, which needs to be solved urgently

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
  • Underground coal mine drilling, heat injection and hole sealing integration method
  • Underground coal mine drilling, heat injection and hole sealing integration method
  • Underground coal mine drilling, heat injection and hole sealing integration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0021] The integrated method of heat injection and hole sealing for coal mine underground drilling of the present invention has the following steps:

[0022] a. Construct a disc-shaped slot 6 at intervals of 5-10m in the rock formation section in the borehole 8 by using a high-pressure jet;

[0023] b. Connect the 1m-long plastic casing 9 through the screw connection between the ends, and send it to the coal-seeing point of the drill hole 8;

[0024] c. Grouting between the outer wall of the plastic sleeve 9 and the wall of the borehole 8 to fix the plastic sleeve 9;

[0025] d. After the grouting slurry 7 is condensed, send it into the heat injection pipe 5 in the plastic sleeve 9, inject superheated steam into the coal seam 1 through the heat injection pipe 5, and withdraw the heat injection pipe 5 after injecting heat for 2 to 4 hours; The heat pipe 5 ...

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 provides an underground coal mine drilling, heat injection and hole sealing integration method suitable for drilling, high-pressure heat injection and hole sealing. The method is characterized in that multiple disc-shaped slots are cut in a bottom plate rock stratum through high-pressure jet flow; a plastic sleeve is fed into a drilled hole, and grout is injected into the portion between the wall of the drilled hole and the outer wall of the plastic sleeve; after the grout is condensed, a heat injection pipe is fed into the sleeve for heat injection; after heat injection is finished, the heat injection pipe is withdrawn, two polyurethane reaction bags are arranged at the end, close to a coal bed, of the drilled hole, and the portion between the two bags is filled with a heat insulating material; grout is injected into the opening end of the drilled hole, and then hole sealing is finished. The method has the advantages of being capable of insulating heat, resistant to high pressure, high in sealing degree and the like, the problems that hole sealing fails and gas leaks from hole wall cracks due to heat loss and high pressure in the heat injection process can be effectively solved, the heat injection pipe can be recycled, and heat injection cost is low.

Description

technical field [0001] The invention relates to an integrated method of heat injection and hole sealing for underground drilling in coal mines, and is especially suitable for high-pressure heat injection and hole sealing for drilling. Background technique [0002] Aiming at the problems that my country's coal seams generally have the characteristics of microporosity, low permeability, and high adsorption, which result in low coal seam permeability and difficult gas extraction, the patent application CN201410404943.0 (a gas explosion-induced fracturing coal mass strengthening in drilling holes) Drainage method) proposes to premix the gas gushing out of the borehole with air and detonate to form an explosion shock wave to crack the coal body, and at the same time, the thermal effect of the explosion can promote the desorption and flow of gas, so as to achieve the purpose of strengthening coal seam gas drainage . Patent application 200810079794.X (method for extracting coalbed m...

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 Applications(China)
IPC IPC(8): E21B43/24E21F7/00E21B33/10
Inventor 林柏泉刘厅邹全乐孔佳朱传杰郭畅姚浩闫发志
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