A coal mine circulation pulse gas injection displacement drainage gas system

Abstract

The invention discloses a coal mine underground circulation pulse gas injection displacement extraction gas system, which comprises a high-pressure pulse gas injection system, a punching prevention pressure relief protection system and a gas extraction system. The invention can perform high-pressure pulse gas fracturing on coal seams, and then use high-pressure gas to displace gas, effectively reduce waste generated in the process of coal fracturing and anti-permeability enhancement, and reduce pollution to the working environment. At the same time, through controllable high-pressure The gas is injected in multiple pulse cycles to greatly reduce the possibility of coal outburst or punching in the process of fracturing and displacing gas, which is more suitable for coal seam permeability enhancement and efficient drainage in high gas mines and outburst mines, greatly saving manpower and material resources , shorten the extraction time, and solve the problems of low coal safety and waste of water resources in the fracturing process of the coal seams in outburst mines and high-gas mines in the prior art, and have high economic benefits.

Description

technical field [0001] The invention relates to the field of gas drainage in coal mines, in particular to a coal mine underground circulation pulse gas injection displacement gas drainage system. Background technique [0002] Gas drainage is the most fundamental and effective way to solve mine gas. According to the "Coal Mine Safety Regulations", when the absolute gas emission from the mine or mining area (working face) is greater than the gas emission allowed to be diluted by ventilation, the gas extraction needs to be considered. When ventilation is no longer able to solve the problem of large gas emission, gas management must be changed from the original single ventilation solution to "gas drainage as the mainstay, supplemented by wind exhaust", and use wind exhaust to make up for the flow and drainage of the drainage system. The need for unbalanced concentration. [0003] In order to improve the drainage efficiency, the method of artificially increasing the gas permeab...

AI Technical Summary

Problems solved by technology

The use of conventional hydraulic slotting is affected by many factors. For example, Article 217 of the "Coal Mine Safety Regulations" stipulates that hydraulic punching measures shall not be used for mining faces with protruding coal seams, and conventional hydraulic fracturing measures will Great waste of water resources

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