Hole-flushing method for gas extraction drilled hole under coal mine

Abstract

The invention discloses a hole-flushing method for a gas extraction drilled hole under a coal mine. A hole-flushing device composed of a water tank, a high-pressure pump, a high-pressure hard pipe, a high-pressure hose, a self-propelled drill bit, a base, a winch and a pushing mechanism is adopted for crashing and flushing blocked and collapsed parts of the gas extraction drilled hole which blockage and collapse occur on under the coal mine through the rock-breaking capacity of self-propelled water jet, and the drilled hole is dredged and reamed; traction force provided by the self-propelled drill bit is utilized for moving the high-pressure hose forwards in a straightening mode; the characteristics that the resin pipe has certain rigidity and can transmit pushing force are utilized for moving the self-propelled drill bit forwards within a larger range. The hole-flushing method mainly has the effects of dredging and reaming the blocked and collapsed drilled hole under the coal mine so as to improve gas extraction efficiency. Compared with the prior art, the hole-flushing method has the advantages of being convenient to operate, capable of improving hole-flushing efficiency and the like and is mainly suitable for dredging the blocked extraction drilled hole in the process of gas extraction on a soft coal bed.

Description

technical field [0001] The invention belongs to the field of coal mine production, and relates to a hole washing method for underground gas drainage boreholes in coal mines, which is suitable for dredging blocked drainage boreholes during gas drainage in low-permeable coal seams. Background technique [0002] There are a large number of high-gas mines in my country and they are widely distributed, and most of the high-gas mines are coal and gas outburst mines. At the same time, the depth of mine mining is increasing year by year, the gas content of coal seams is further increasing, and the number of outburst coal seams is increasing. Drilling pre-extraction of gas is one of the most common methods to control coal mine gas disasters, but outburst coal seams are generally soft, especially in Southwest China, where 93.14% of the mineable coal seams are soft coal seams that have the risk of coal and gas outburst. Due to the low strength of coal and rock mass, after the gas drai...

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Problems solved by technology

[0004] The present invention aims at the problems that gas drainage drilling holes in soft coal seams are prone to collapse and blockage, which affects gas drainage efficiency and threatens coal mine safety production. Water jet and active propulsion to the power pipeline, a method for dredging and unclogging coal mine gas collapse and blocked drilling

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