The Method of Improving the Air Permeability of Coal Seam by Concentrated Blasting with Directional Hydraulic Pressure

A technology of directional blasting and air permeability, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., and can solve problems such as the effect to be improved, limited permeability enhancement at the top of the coal seam, and blowout

Active Publication Date: 2020-06-26
HUNAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual application, this method also has the following defects: 1. In order to avoid a large amount of explosion fragments spraying upwards along the blast hole, it is necessary to use yellow mud rolls to block the blast hole within 10m of the hole, and fill the blast hole with yellow mud. Mud rolls are more work
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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  • The Method of Improving the Air Permeability of Coal Seam by Concentrated Blasting with Directional Hydraulic Pressure
  • The Method of Improving the Air Permeability of Coal Seam by Concentrated Blasting with Directional Hydraulic Pressure
  • The Method of Improving the Air Permeability of Coal Seam by Concentrated Blasting with Directional Hydraulic Pressure

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Effect test

Embodiment 1

[0050] figure 1 , 3 and 5 show the specific structure of the directional hydraulic concentrated blasting device involved in the present embodiment, which includes a directional blasting tube 1, the two ends of the directional blasting tube 1 are sealed by a cover plate, and the outer peripheral surface of the directional blasting tube 1 is spaced apart. A plurality of energy release holes 1a, the energy release 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 outer peripheral surface of the directional blasting tube 1 is wrapped with a layer The high-pressure plastic film 4, the energy release hole 1a is covered by the high-pressure plastic film 4, and the top of the directional blasting pipe 1 is connected with a first block for blocking the blast hole during explosion to prevent blast fragments from ejecting upward along the blast h...

Embodiment 2

[0056] See figure 2 , 3As 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 a...

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Abstract

The invention provides a method for improving the coal seam permeability by adopting directional hydraulic concentrated blasting and relates to the technical field of coal seam antireflection. The method comprises the following steps: step 1, drilling a blast hole in a coal seam, then performing hydraulic pre-splitting antireflection on the coal seam by utilizing the drilled blast hole, prohibiting the extraction of water remaining in the blast hole after hydraulic pre-splitting antireflection and ensuring that the water surface in the blast hole is at least higher than 2 m of the upper part of the coal seam; step 2, putting a directional hydraulic concentrated blasting device in the blast hole and sinking into the water surface; and step 3, detonating the directional hydraulic concentrated blasting device to detonate under the water and finish the antireflection operation. The method provided by the invention has the benefits that firstly, the hydraulic pre-splitting antireflection is performed on the coal seam, and then the directional hydraulic concentrated blasting device with a specific structure is detonated in the water remaining in the blast hole; through the coupling of detonation gas with the water remaining in the blast hole and the coal beam after hydraulic fracturing operation, the fracture development degree in the coal seam can be greatly improved; and through the method, before blasting, a yellow mud roll is not required to be poured in the blast hole, so that the operation is very convenient.

Description

technical field [0001] The invention relates to the technical field of coal seam anti-permeability, in particular to a method for improving the air permeability of coal seams by adopting directional water pressure concentrated blasting. 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 accident...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/263
CPCE21B43/263
Inventor 李广利刘爱群廖可兵董子文皮子坤张建滕广平耿伟乐
Owner HUNAN INST OF TECH
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