Gas pressure relief method of ground drilling extraction minery and goaf

A technology for ground drilling and gobs, which is applied in the direction of gas discharge, earthwork drilling, and mining fluids, etc. It can solve the problems of difficult coal seam fracturing, large gas flow attenuation coefficient in drilling holes, and soft coal seams, etc., to reduce gas surges The effect of output volume, elimination of outstanding risk, and increase of air permeability coefficient

Inactive Publication Date: 2005-11-09
HUAINAN MINING IND GRP
View PDF0 Cites 61 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The Lianghuai coalfield has experienced multiple tectonic movements, and the original structure of some coal seams has been destroyed, forming scaly and powdery structural coal. The damage types of coal are generally three to four types, resulting in a complex fracture-cleat system in the coal seam reservoir. The coal quality is soft, the permeability of the coal seam is low, and the fracturing effect is poor
[0011] 2. Most of the coal seams in the Lianghuai and Huaihe Rivers have low air permeability coefficients and large gas flow attenuation coefficients in boreholes, making them difficult

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
  • Gas pressure relief method of ground drilling extraction minery and goaf
  • Gas pressure relief method of ground drilling extraction minery and goaf
  • Gas pressure relief method of ground drilling extraction minery and goaf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] see figure 1 Before coal mining starts at the mining face of the coal seam 1 in the lower part of the coal seam group or before the overlying coal seams 2 are not affected by the mining of the working face of the lower mining coal seam 1, advance from the ground 15 to the long-distance, low-permeable, high-gas, Prominent and soft overlying coal seams 2 penetrate the layer ground and drill wells 12; and then mining coal seams 1 at the lower part of the overlying coal seams 2 with interlayer distances of 66.7m-96.8m and relative interlayer distances of 35-51 times. A large amount of coal is mined in the working face of the lower mining coal seam 1, so a large mining layer goaf 3 is formed behind the mining face, and a continuous pressure relief space is formed in the goaf 3, and the rock strata above the pressure relief space and The overlying coal seams 2 begin to deform and displace in the direction of the goaf pressure relief space due to the pressure relief during min...

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
Inner diameteraaaaaaaaaa
Login to view more

Abstract

This invention discloses a method for depressuring gas in ground drilled well and mining area. Before extracting coal a ground drilling well is drilled from ground to long distance, low breathing, high gas, projecting and soft covered seams, then extracting down seam. The gas from the up covered seam is exhausted from pipe.

Description

Technical field: [0001] The invention relates to a method for pressure relief, permeability enhancement and flow enhancement of coal body gas. More specifically, it is a pressure-relieving coalbed methane mining method in mining areas aimed at overlying long-distance, low-permeable, high-gas, protruding, soft and thick coal seams. Background technique: [0002] Mine gas is the main reason for restricting production development, causing gas explosions and coal and gas outbursts. To control gas disasters, eliminate coal and gas outbursts, reduce the amount of gas gushing out of mining faces, improve productivity, and realize green co-mining of coal and gas resources The fundamental way is to extract coal gas. [0003] The Huainan Coalfield in Anhui is buried at a depth of more than 2000m, with a total of 50100Mt of preserved and predicted coal reserves. The coalbed methane resource density of the entire coalfield is 142Mm 2 / km 2 Above, up to 405Mm 3 / Km 2 . According t...

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): E21B43/00
Inventor 袁亮李平刘华民王楚光刘永庆何章盛
Owner HUAINAN MINING IND GRP
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