Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device

Abstract

The invention relates to a liquid carbon dioxide bomb and a propping agent blasting anti-reflection method and a device. The device comprises a liquid storage tube provided with a priming device and liquid carbon dioxide. A releasing tube with propping agent inside is arranged in the front part of the liquid storage tube. A plurality of spray-holes are disposed on the tube wall of the releasing tube. The propping agent is wrapped in a thin strip-shape with plastic film and put into the releasing tube. High-pressure gases produced by vaporized liquid CO2 after liquid CO2 bomb detonates in coal seam form a large number of fractures in drill holes. The high-pressure gas destroys the plastic film wrapping the propping agent during an explosion process. The propping agent with the high-pressure gases enters into coal seam fractures and fractures formed by propping, prolongs existing time of the fractures. The fractures have big presplit radius in coal seam, which can effectively reduce drilling hole amounts in a current extraction and exploitation system in underground coal mines, improve extraction efficiency, reduce pre-extraction time of gas and extraction cost of gas in coal mine, improve a production efficiency of coal, and enhance security of coal production.

Description

technical field [0001] The invention relates to the technique of increasing the air permeability of coal seams, in particular to a method and device for blasting anti-permeability of liquid carbon dioxide cannon plus proppant which are suitable for low air permeability coal seams. Background technique [0002] According to the "Regulations on the Prevention and Control of Coal and Gas Outburst" and the "Interim Measures for Gas Drainage Standards", for high-gas coal seams and outburst coal seams, gas drainage must be carried out before mining. However, most of the high-gas outburst coal seams in my country have very low air permeability, which is not conducive to gas drainage. Before coal seam drainage, it is necessary to increase the permeability of the coal seam to improve the air permeability of the coal seam. The current anti-reflection technologies mainly include anti-reflection technologies such as hydraulic fracturing, hydraulic punching, deep hole blasting and liquid...

AI Technical Summary

Problems solved by technology

However, most of the high-gas outburst coal seams in my country have very low air permeability, which is not conducive to gas drainage. Before coal seam drainage, it is necessary to increase the permeability of the coal seam to improve the air permeability of the coal seam.

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