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Supercritical CO2 point type jet impingement gas explosion-induced coal and rock mass cracking method

A technology of jet impingement, coal and rock mass, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. Blasting range and rock breaking effect, expanding effective fracturing range, low cost effect

Active Publication Date: 2018-12-14
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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  • Supercritical CO2 point type jet impingement gas explosion-induced coal and rock mass cracking method
  • Supercritical CO2 point type jet impingement gas explosion-induced coal and rock mass cracking method
  • Supercritical CO2 point type jet impingement gas explosion-induced coal and rock mass cracking method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A supercritical CO 2 The method for cracking coal and rock mass by point jet impact gas explosion, this embodiment is a method for increasing penetration of coal mass, and its specific implementation method is as follows figure 1 , figure 2 Shown:

[0053] Step 1. From the air inlet lane (4) and the air return lane (3) to the coal seam (2), construct half-length and staggered bedding drilled holes in the working face (5) as blast holes (6), observe hole / drainage hole / control hole (7), the distance from the blast hole (6) to the working face (5) is greater than the minimum resistance line of coal blasting;

[0054] Step 2. Using liquid CO 2 One end of the cracker (8) is provided with a discharge valve (9), and the other end is provided with a filling valve (10). The pipe body between the discharge valve (9) and the filling valve (10) is an energy storage pipe (11 ), the liquid CO 2 Cracker (8) is provided with the detonation circuit wire (15) that connects detonato...

Embodiment 2

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

[0064] Step 1. On the steps of the open-pit coal seam (2), make vertical drill holes row by row as blast holes (6), and the row spacing is set according to the step width, length and physical and mechanical properties of the open-pit coal seam (2), and the coal seam (2) The shortest distance (L) from the outermost blast hole (6) of the step to the surrounding air surface (17) is smaller than the minimum resistance line of coal blasting;

[0065] Step 2. Adopt chain (18) and liquid CO 2 The cracker (8) is bound 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 anchorage (19) to prevent liquid CO 2 The cracker (8)...

Embodiment 3

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

[0071] Using supercritical CO 2 The method of blasting residual top coal by point jet impingement gas explosion is basically the same as that of Example 2, except for Step 1 and Step 5.

[0072] Wherein, step 1 is: in the residual top-coal (22) implements row by row of inclined drill holes successively as blast holes (6), and its hole depth and inter-row spacing are respectively according to residual top-coal (22) thickness, suspended roof length and The physical and mechanical properties of the coal body are set, and the shortest distance from the outermost blast hole (6) to the surrounding air surface (17) is smaller than the minimum resistance line of the coal body blasting;

[0073]Step 5 is: after the quick-se...

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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 increasing permeability of low-permeability gas coal seams in coal mines and the field of blasting engineering, in particular to a supercritical CO 2 A method for fracturing coal and rock mass by point jet impingement gas explosion. Background technique [0002] Supercritical CO 2 The gas explosion fracturing technology originated from the Cardox technology invented by American engineers in 1914. It uses liquid CO 2 The high-pressure gas produced by heating and expansion is a non-explosive physical blasting technology that breaks coal seams and rock formations. Compared with hydraulic fracturing and chemical blasting, supercritical CO 2 The maximum peak pressure generated by the gas explosion is between the maximum peak pressure generated by the hydraulic fracturing and the chemical explosive explosion, which can avoid the consumption of most of the limited explosive energy caused by the crushed area o...

Claims

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Application Information

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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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