Coal seam drilling interconnection method, system and gas drainage method based on impact technology

Abstract

The invention relates to a coal seam drilling interconnection method and system based on impact technology, and a gas drainage method, belonging to the technical field of coal mine gas drainage. The interconnection method includes the following steps: constructing gas drainage drilling and impact construction drilling in the trough of the mining face, the impact construction drilling is used to accommodate the guide pipe; setting the guide pipe in the impact construction drilling; passing the guide pipe Percussion drilling is carried out on the coal seam, and the gas drainage drilling and percussion construction drilling are connected through the percussion drilling. The interconnection system includes gas drainage boreholes and percussion construction boreholes set up on the coal seam, and guide pipes are arranged in the percussion construction boreholes; the drainage method, after implementing the above-mentioned interconnection method, the gas drainage boreholes and percussion construction Drainage is carried out after the borehole is plugged. The invention can interconnect and form a good through network in the soft and low-permeability coal seam, improve the gas extraction efficiency of the soft and low-permeability coal seam, greatly reduce the difficulty of gas extraction in the coal seam, and ensure the safety of coal production.

Description

Coal seam drilling interconnection method, system and gas drainage method based on impact technology technical field The invention belongs to the coal mine gas extraction technical field, relate to a kind of coal seam drilling interconnection method based on impact technology Methods, systems and gas extraction methods. Background technique Coal mine gas is a kind of unconventional natural gas associated with coal and mainly stored in coal seams in an adsorbed state. The composition is methane, and a small amount of ethane, propane and butane, in addition to generally containing hydrogen sulfide, carbon dioxide, nitrogen and moisture, As well as trace amounts of inert gases such as helium and argon. Gas is the main threat to mine safety, especially in the southwest of my country In the area, most of the mines are coal and gas outburst mines, and the permeability coefficient of the main coal seam is small, and the coal is soft and soft, which is a soft and low permea...

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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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