Coal seam drilling interconnection method and system based on impact process and gas extraction method

Abstract

The invention relates to a coal seam drilling interconnection method and system based on an impact process and a gas extraction method, and belongs to the technical field of coal mine gas extraction. The interconnection method comprises the following steps that gas extraction drill holes and impact construction drill holes are constructed in a gate roadway of a stope face, and the impact construction drill holes are used for containing guide pipes; the guide pipes are arranged in the impact construction drill holes; and impact drilling is carried out on a coal seam through the guide pipes, and the gas extraction drill holes and the impact construction drill holes communicate through impact drill holes. The interconnection system comprises the gas extraction drill holes and the impact construction drill holes which are formed in the coal seam, and the guide pipes are arranged in the impact construction drill holes. According to the extraction method, after the interconnection method is implemented, extraction is carried out after the gas extraction drill holes and the impact construction drill holes are blocked. According to the coal seam drilling interconnection method and system based on the impact process and the gas extraction method, a good through network can be formed in the soft and low-permeability coal seam through interconnection, the gas extraction efficiency of the soft and low-permeability coal seam is improved, the gas extraction difficulty of the coal seam is greatly reduced, and the production safety of coal is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and relates to a coal seam drilling interconnection method and system based on impact technology, and a gas drainage method. Background technique [0002] Coal mine gas is an unconventional natural gas that is associated with coal and is mainly stored in coal seams in an adsorbed state. Its main component is methane, and a small amount of ethane, propane and butane. And water vapor, and trace amounts of inert gases, such as helium and argon. Gas is the main threat to mine safety production, especially in the southwestern region of my country, where most mines are coal and gas outburst mines, and the main mining coal seam has a small air permeability coefficient, and the coal quality is soft, which belongs to soft and low permeability coal seam. Extraction is extremely difficult. In addition, most of the coal mines in Southwest my country have complicated geological conditions,...

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Problems solved by technology

Gas is the main threat to mine safety production, especially in the southwestern region of my country, where most mines are coal and gas outburst mines, and the main mining coal seam has a small air permeability coefficient, and the coal quality is soft, which belongs to soft and low permeability coal seam. Extraction is extremely difficult

In addition, most of the coal mines in Southwest my country have complicated geological conditions, and the roadways of the coal mine mining face are narrow, so it is difficult to use high-power and efficient drilling technology to implement large-scale gas drainage in coal seams

Most mines still adopt the traditional gas drainage drilling technology to extract coal seam gas. However, due to the limitation of coal seam gas geological factors, most mines have low gas extraction efficiency and poor drainage effect, and it is difficult to realize the gas extraction before the working face mining. Gas drainage meets the standard, which not only affects the normal mining connection of the mine, but also reduces the safety benefits of the coal mine

[0003] At present, although there are many hydraulic anti-permeability measures to implement enhanced drainage for such soft and low-permeability coal seams, due to the soft texture of coal seams, the application of hydraulic anti-permeability measures is often not effective.

This is because the soft coal seam is very easy to form "paste" slime when it meets water, which will lead to the blockage of the borehole under the action of the ground stress, and the hole collapse often occurs within a certain period of time after the completion of the ordinary borehole construction. The situation makes the gas drainage borehole ineffective

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