Quick pressure-relief gas discharge method for exposing super-thick and soft outburst coal seam in vertical wellbore

A technology for outburst coal seam and wellbore, which is applied in the field of rapid pressure relief and gas discharge, can solve the problems of downhole being easily affected by water seal, small control range of single hole, well wall cracking, etc., so as to achieve rapid pressure relief gas discharge, The effect of increasing single-hole discharge and accelerating gas discharge

Inactive Publication Date: 2017-01-11
CHINA UNIV OF MINING & TECH
View PDF5 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, for the soft coal seam, the air permeability is poor, and the downward drilling is easily affected by the water seal, which makes it difficult to discharge gas and the control range of a single hole is small
Based on the above factors, using the traditional gas discharge method, th

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
  • Quick pressure-relief gas discharge method for exposing super-thick and soft outburst coal seam in vertical wellbore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The present invention will be further explained below in conjunction with the accompanying drawings.

[0029] A method for quickly releasing pressure and releasing gas through nine strokes and nine injections for piercing through an extra-thick soft outburst coal seam by shaft shaft of the present invention comprises the following steps:

[0030] The first step is to excavate the wellbore to a position 7m away from the coal seam, and design multiple circles of discharge drilling holes from the outside to the inside along the contour line of the working face of the shaft excavation, and the distance between the bottom of the discharge drilling holes is 3m;

[0031] The second step, as shown in the figure, divides the designed discharge borehole into multiple nine-punch and nine-injection units according to the spacing of 6m×6m. Each nine-punch and nine-injection unit contains 9 boreholes, and calculates the single hole Minimum amount of coal flushing;

[0032] The third...

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 quick pressure-relief gas discharge method for exposing a super-thick and soft outburst coal seam in a vertical wellbore. The method comprises the following steps: designing discharge drilling holes in several circles along the contour of the wellbore heading face; dividing the drilling holes into a plurality of nine-hole thrusting units, and nine-hole injection units; drilling for each nine-hole thrusting unit and each nine-hole injection unit; conducting pressure test for drilling; thrusting coal of the 9 holes of the nine-hole thrusting units and the nine-hole thrusting units sequentially; constructing a gas inspection hole in the area of the nine-hole thrusting and nine-hole injection units in the thrusting, and measuring gas content; cementing the 9 drill holes of the nine-hole thrusting units and the nine-hole injection units after measuring the gas content; thrusting and cementing all the nine-hole thrusting units and the nine-hole injection units sequentially. The quick pressure-relief gas discharge method avoids the problem of cracking of the borehole wall after the change of the punching stress, and strengthens the coal, and increases the single hole discharge under the premise of ensuring the safety, and realizes the quick pressure-relief gas discharge of the super-thick and soft outburst coal seam.

Description

technical field [0001] The invention relates to a rapid pressure relief and gas discharge method for piercing through an ultra-thick, soft, and outburst coal seam by an underground shaft shaft, and is suitable for gas elimination and outburst discharge of the ultra-thick, soft, and outburst coal seam with a narrow working surface of the shaft shaft. Background technique [0002] The current "Regulations on the Prevention and Control of Coal and Gas Outbursts" stipulates in Article 49 (4) that the outburst prevention measures for the coal seam gas area in the coal seam area should be in the area where the coal seam is exposed. The minimum normal distance between the coal working face and the coal seam shall be implemented before 7m (the distance should be appropriately increased in the structural failure zone). The minimum control range of drilling is: 12m outside the roadway contour line at the coal mining site of Shimen, vertical shaft and inclined shaft (6m at the bottom o...

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): E21F7/00E21B7/18E21B33/13
CPCE21B7/18E21B33/13E21F7/00
Inventor 李晓伟唐俊陈裕佳蒋承林王超杰潘兴峰孔卓一陈子贤周震廖晓雪高广强
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