Gas-containing coal permeation-increasing method adopting joint action of carbon dioxide detonation and acidification

Abstract

The invention discloses a gas-containing coal permeation-increasing method adopting joint action of carbon dioxide detonation and acidification. According to working face parameters, the coal seam thickness, the gas content and the like, the drilling hole arranging mode of a permeation-increasing unit is comprehensively confirmed, and a plurality of permeation-increasing units are arranged on a working face; and drilling holes in the permeation-increasing unit are adopted with the following measures that firstly, carbon dioxide detonation is conducted through a detonation hole, then acid liquid is injected through an acidification hole, the setting time is maintained, and finally, the detonation hole and the acidification hole are connected into an extraction system to conduct gas extraction. According to the permeation-increasing method of the coals containing the gas through the joint action of detonation and acidification of the carbon dioxide, while coal seam breathability is increased, the content of the carbon dioxide is greatly improved through early carbon dioxide detonation and later-period acidification, and additionally, the adsorption capacity of the coals on the carbon dioxide is further larger than that of methane, so that the replacement and displacement effects on the methane are achieved. According to the gas-containing coal permeation-increasing method adopting the joint action of carbon dioxide detonation and acidification, through sufficient combination of the advantages of carbon dioxide detonation and acidification, coal seam breathability is greatly improved, and the gas extraction rate is improved.

Description

technical field [0001] The invention relates to a gas-containing coal body anti-permeability method, in particular to a gas-containing coal body anti-permeability method through the combined action of carbon dioxide blasting and acidification, and belongs to the technical field of anti-gas outburst safety management in coal mines. Background technique [0002] my country is the world's largest coal producer and consumer, and coal plays an important role in my country's energy structure. In recent years, my country's coal mines have invested heavily in safety, and have achieved good results. However, coal mine accidents do happen from time to time. Statistics show that mine gas accidents and roof accidents account for more than 80% of the total accidents, among which mine gas accidents become the first killer of coal mines because of their high degree of harm, high casualty rate, and large economic losses. It can be seen that mine gas control has become the fundamental poin...

AI Technical Summary

Problems solved by technology

The above-mentioned technical means can achieve certain positive effects in the aspect of gas-containing coal permeability enhancement, but there are also certain limitations.

Deep-hole controlled pre-splitting blasting often has the phenomenon of blast rejection and extinguishment, and once the processing procedures are cumbersome, it is easy to leave safety hazards for coal seam mining, and the effect of anti-permeability varies; hydraulic fracturing and hydraulic slotting are currently used Wider, but hydraulic fracturing has little effect in tectonic coal zones, coupled with the differences in coal seams in some areas and the inhibition of water on gas desorption, resulting in unsatisfactory anti-permeability effects

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