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A Method for Cracking Coal and Rock Mass by Impacting Gas Explosion with Supercritical CO2 Point Jet

A technology of jet impact, coal and rock mass, applied in the direction of mining fluid, earthwork drilling, wellbore/well parts, etc., can solve problems such as unfavorable, poor fracturing effect, unsatisfactory blasting and rock breaking effect, etc., and achieve cost Low, improve the blasting range and rock breaking effect, and expand the effect of effective cracking range

Active Publication Date: 2020-06-09
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The larger the gap between the cracker and the blast hole, the more unfavorable it is for the limited blast energy released by the cracker to be used for cracking coal and rock mass, and ultimately the cracking effect is not good or the blasting rock breaking effect is not ideal

Method used

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  • A Method for Cracking Coal and Rock Mass by Impacting Gas Explosion with Supercritical CO2 Point Jet
  • A Method for Cracking Coal and Rock Mass by Impacting Gas Explosion with Supercritical CO2 Point Jet
  • A Method for Cracking Coal and Rock Mass by Impacting Gas Explosion with Supercritical CO2 Point Jet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] a supercritical CO 2 The method for cracking coal and rock mass caused by point-type jet impacting gas explosion, this embodiment is a method for increasing the permeability of coal mass, and its specific implementation is as follows: figure 1 , figure 2 shown:

[0053] Step 1. From the air inlet road (4) and the return air road (3) to the coal seam (2), make the working face (5) half-length and staggered drill holes as blasting holes (6), observation For the hole / drainage hole / control hole (7), the distance from the blasting hole (6) to the working face (5) is greater than the minimum resistance line of coal blasting;

[0054] Step 2. Liquid CO employed 2 One end of the cracker (8) is provided with an energy discharge valve (9), the other end is provided with a charging valve (10), and the pipe body between the energy discharge valve (9) and the charging valve (10) is an energy storage pipe (11). ), the liquid CO 2 The cracker (8) is provided with a detonation ci...

Embodiment 2

[0063] a supercritical CO 2 The method for cracking coal and rock mass caused by point jet impact gas explosion, this embodiment is a method for blasting open-pit coal seam, and its specific implementation is as follows: image 3 , Figure 4 , Figure 5 (b) shows:

[0064] Step 1. On the steps of the open-pit coal seam (2), drill vertical holes row by row as blasting holes (6). (2) The shortest distance (L) from the outermost blasting hole (6) of the step to its surrounding empty surface (17) is less than the minimum resistance line of coal blasting;

[0065] Step 2. Using chains (18) and liquid CO 2 The fracturing device (8) is bundled with the filling valve (10), and the chain (18) is anchored in the stable coal and rock body outside the blasting affected area through the anchor (19) to prevent liquid CO 2 The cracker (8) is thrown away, and then the liquid CO 2 The cracker (8) is pushed to the bottom of the blasting hole (6), and the end of the energy release valve (9...

Embodiment 3

[0070] a supercritical CO 2 The method for cracking coal rock mass caused by point jet impact gas explosion, this embodiment is a method for blasting residual top coal, and its specific implementation is as follows: Image 6 , Figure 7 , Figure 8 shown:

[0071] Utilize supercritical CO 2 The method of blasting residual top coal by point jet impingement gas blasting and fracturing coal mass is basically the same as that in Example 2, and the difference lies in Step 1 and Step 5.

[0072] Wherein, step 1 is as follows: in the residual top coal (22), inclining boreholes are sequentially performed row by row as blasting holes (6), and the hole depth and row spacing are respectively based on the thickness of the residual top coal (22), the length of the overhang and the The physical and mechanical properties of the coal body are set, and the shortest distance from the outermost blasting hole (6) to its surrounding empty surface (17) is less than the minimum resistance line o...

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Abstract

The invention relates to a supercritical CO2 point type jet impingement gas explosion-induced coal and rock mass cracking method and belongs to the coal mine underground low-permeability gas seam permeability increase technological field and blasting engineering field. According to the method, boreholes are formed in coal and rock mass so as to be adopted as a blasting hole and an auxiliary hole;a liquid CO2 cracker is pushed to the bottom of the blasting hole, and a detonating circuit is detected, so that the connection of the detonating circuit can be ensured; a foam hole sealing agent / quick setting expansion agent is injected into the blasting hole, so that the blasting hole can be divided into different segments, the intervals of the segments are grouted, and the grouting quantities of the intervals are estimated according to the volume of each interval; and the liquid CO2 cracker is detonated, and after blasting is finished, a cracking effect is detected, and the cracker is collected. According to the method, the finite explosive energy of supercritical CO2 gas explosion is utilized to the greatest extent so as to be concentrated at one point or surface to be used for cracking the coal and rock mass; and therefore, an effective cracking range can be expanded, or the cracking rate of the coal and rock mass can be improved. The method has the advantages of more obvious effect, easiness in operation and low cost.

Description

technical field [0001] The invention relates to the technical field of permeation enhancement of low-permeability gas coal seams in coal mines and the field of blasting engineering, in particular to a supercritical CO 2 The method of point jet impingement gas explosion to fracturing coal rock mass. Background technique [0002] supercritical CO 2 The gas explosion cracking technology originated from the Cardox technology invented by American engineers in 1914. It uses liquid CO 2 The high-pressure gas generated by heating and expansion is used for non-explosive physical blasting technology to rupture coal seams and rock layers. Compared with hydraulic fracturing and chemical explosive blasting, supercritical CO 2 The maximum peak pressure generated by gas explosion is between the maximum peak pressure generated by hydraulic fracturing and chemical explosive explosion, which can avoid the consumption of most of the limited blasting energy due to the excessive pressure caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/263E21B43/26
CPCE21B43/006E21B43/261E21B43/263
Inventor 赵宝友郑天照张立新李佳伟
Owner LIAONING TECHNICAL UNIVERSITY
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