Directional hydraulic centralized exploding device for improving gas permeability of coal seam

A technology of directional blasting and air permeability, which is applied in the direction of mining fluid, wellbore/well components, earthwork drilling and mining, etc. It can solve problems such as the effect needs to be improved, the effect of increasing the permeability of the top of the coal seam is limited, and the workload of filling yellow mud rolls is large.

Active Publication Date: 2017-12-22
HUNAN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, in actual application, the blasting device that this method adopts also has the following defects: 1. In order to avoid a large amount of explosion fragments from spraying upwards along the blasthole, it needs to be blocked with yellow mud rolls within the range of 10m away from the orifice. The workload of filling the yellow mud rolls into the blast holes is relatively large
2. The blasting device can only be placed at the bottom of the blast hole. For thicker coal seams (for example, 10m thick), the effect of bottom blasting on the top of the coal seam is very limited.
3. The amount of water in the water bag is small, and the "spike effect" formed by the coupling of water and explosive gas is limited, and the effect still needs to be improved

Method used

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  • Directional hydraulic centralized exploding device for improving gas permeability of coal seam
  • Directional hydraulic centralized exploding device for improving gas permeability of coal seam
  • Directional hydraulic centralized exploding device for improving gas permeability of coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] figure 1 , 3 and 5 show the specific structure of the directional hydraulic concentrated blasting device used to improve the gas permeability of the coal seam involved in the present embodiment, which includes a directional blasting tube 1, and the two ends of the directional blasting tube 1 are sealed by a cover plate, and the directional blasting tube 1 A plurality of energy release holes 1a are spaced apart on the outer peripheral surface of the directional blasting tube 1, and the energy releasing holes 1a communicate with the inner cavity of the directional blasting tube 1, and the inner cavity of the directional blasting tube 1 is filled with explosive rolls 2 and detonators 3, and the directional blasting tube 1 A layer of high-pressure plastic film 4 is wrapped on the outer peripheral surface of the wall, the energy release hole 1a is covered by the high-pressure plastic film 4, and the top of the directional blasting tube 1 is connected with a hole for blocking...

Embodiment 2

[0047] See figure 2 , 3 As shown in and 6, the difference between embodiment 2 and embodiment 1 is that the structure of the plugging assembly connected to the bottom end of the directional blasting tube 1 is different from that of embodiment 1. Specifically, in this embodiment, the directional blasting tube 1 The bottom end of the third plugging assembly 7 is installed, the third blocking assembly 7 also includes a hollow tubular body 5a, the top of the tubular body 5a is provided with a top cover 5a1, and the inner cavity of the tubular body 5a is provided with a partition 5a2, the partition The plate 5a2 divides the inner chamber of the tubular body 5a into a connection chamber 5a3 on one side and a pressure chamber 5a4 on the other side. Matching screw connection structure, the bottom end of the directional blasting pipe 1 is screwed into the connection chamber 5a3 and fixedly connected with the tubular body 5a, and the outer peripheral surface of the tubular body 5a is ...

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Abstract

The invention discloses a directional hydraulic centralized exploding device for improving the gas permeability of a coal seam, and relates to the technical field of coal seam permeability improvement. The directional hydraulic centralized exploding device for improving the gas permeability of the coal seam comprises a directional exploding tube, wherein the two ends of the directional exploding tube are sealed by cover plates; a plurality of energy release holes are formed in the outer circumferential surface of the directional exploding tube at intervals; the energy release holes are communicated with the inner cavity of the directional exploding tube; the inner cavity of the directional exploding tube is filled with explosive rolls and detonators; the outer circumferential surface of the directional exploding tube is coated with a high-pressure plastic thin film; the energy release holes are covered by the high-pressure plastic thin film; the top end of the directional exploding tube is connected with a first plugging assembly for plugging a blast hole during explosion so as to prevent explosion fragments from being upwardly ejected along the blast hole. Through coupling of explosion gas and water which is left in the blast hole and the coal seam after a hydraulic fracturing operation, the directional hydraulic centralized exploding device can greatly improve the development degree of a fracture in the coal seam; in addition, the blast hole of the directional hydraulic centralized exploding device is not required to be filled with a yellow clay roll before explosion, so that the directional hydraulic centralized exploding device is very convenient to operate.

Description

technical field [0001] The invention relates to the technical field of coal seam anti-permeability, in particular to a directional water pressure centralized blasting device for improving the air permeability of coal seams. Background technique [0002] More than half of the existing coal mines are high gas and coal and gas outburst mines. Gas generally exists in coal seams in two forms, that is, adsorption state and free state. In the amount of gas stored in coal seams, the amount of adsorbed gas usually accounts for more than 90%, while the amount of free gas is only about 10%. When the coal seam is mined, the gas trapped in the coal seam is continuously released with the disturbance of the coal seam mining, and its hazards are mainly manifested in three aspects: gas suffocation, gas explosion, and coal and gas outburst. According to statistics, more than 40% of coal mine accidents in my country are gas explosion accidents, among which gas explosion accidents account for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/263
CPCE21B43/26E21B43/263
Inventor 李广利
Owner HUNAN INST OF TECH
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