Coal bed gas drainage method and device

Abstract

The present invention relates to a gas pumping and exchanging method and devices in a coal mine and coal seam, and belongs to the coal mine security field; the present invention aims to prolong the service life of the drill and improve the drilling depth and the drilling speed, and to enhance the safety during pumping gas and to improve the validation of the coal seam. The present invention is characterized in that the method is performed by following steps: starting a high-voltage water pump, adjusting a valve, drill pushing, hole drilling, adjusting the valve drill rotating, grooving, and shutting down the high-voltage water pump. The devices involved in the method mainly comprises the high-voltage water pump, a mixing chamber, abrasive cans, a high-voltage sealed rotator, a drill, drill pipes and a multifunctional drill; the method uses the multiphase oscillation jet to cut off and break the coal seam and also to drill holes and cut grooves; the power effect leads to the evolution of the coal seam fractured field, thereby improving the validation of the coal seam. And the cinder produced is wee and can flow away with water, thereby avoiding the drill holding and the hole bursting; the method can be used to pump and exchange gas in different quality coal mines and to improve the pumping and exchanging capability of the gas.

Description

Technical field [0001] The invention relates to a method and device for gas drainage in coal seams of coal mines, belonging to the field of coal mine safety, and particularly suitable for gas drainage in coal seams with low air permeability in coal mines. Background technique [0002] China is the largest coal producer in the world and the country with the most serious coal mine disaster accidents. Gas drainage is the fundamental measure to prevent coal mine gas disaster accidents. Yuan Liang's "Method for Gas Drainage from the Roof of Mining Coal Seams" (Patent No.: CN1532374)”, Chai Zhaoxi’s “Independent Gas Drainage Mine with Spoke Coal Hole Arrangement (Patent No.: CN2903390)”, mainly through changing the drilling layout to increase the gas drainage volume, but there is a shallow drilling depth , The drilling density is large, the effective range of gas discharge is small, etc., and drilling in soft coal and outburst coal seams often results in hole collapse, drill pinching, ...

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Problems solved by technology

[0002] my country is the largest coal-producing country in the world, and it is also the country with the most serious coal mine disaster accidents. Gas drainage is the fundamental measure to prevent and control coal mine gas disaster accidents. CN1532374)", Chai Zhaoxi's "Independent Gas Drainage Mine with Spoke-shaped Coal Hole Arrangement (Patent No.: CN2903390)", mainly by changing the drilling layout, to improve the gas extraction, but there is a problem that the drilling depth is shallow , high drilling density, small effective range of gas discharge, etc., and drilling in soft coal and outburst coal seams often results in hole collapse, drill pinching, top drilling, and injection holes, as well as the friction between the drill bit, drill pipe and coal rock. The effect, resulting in the drill bit drill pipe temperature is too high and accelerated the wear rate of the drill bit

Due to the low gas permeability of coal seams, the drainage effect of existing drilling methods is not ideal. Compared with the requirements for gas drainage in coal mine gas disaster control, the effect of coal mine gas drainage in my country needs to be improved

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