Gas extraction method based on high-pressure hydraulic cave construction on bedding hole of driving working face

Abstract

The invention discloses a gas extraction method based on high-pressure hydraulic cave construction on a bedding hole of a driving working face. The gas extraction method based on high-pressure hydraulic cave construction on the bedding hole of the driving working face comprises the steps that drilling construction is conducted on the driving working face of a soft high-outburst coal seam, a cave is constructed in the coal seam through a hydraulic jet punching method, a crack extension area is formed around the cave, the permeability of the coal seam is improved, the gas extraction rate is increased, and the drilling construction is horizontal drilling. According to the gas extraction method, a traditional common gas extraction method is abandoned, the traditional cognition limitation of technicians in the field about gas extraction methods is broken, the traditional gas extraction method according to which upward through-stratum drilling extraction or downward through-stratum drilling extraction of a coal seam and horizontal drilling extraction of a driving working face of the coal seam need to be conducted at the same time is converted into the method according to which horizontal drilling extraction only needs to be conducted on the driving working face of the coal seam, and the indispensable upward or downward through-stratum drilling construction which needs to be conducted in traditional cognition is omitted; in addition, potential safety hazards are avoided, the economic cost is greatly reduced, and the gas extraction efficiency is improved.

Description

Technical field [0001] The invention relates to the field of coal mining, in particular to a method for gas drainage with high-pressure water conservancy cave-making along bedding holes in a driving face. Background technique [0002] The coal-bearing strata in my country are mostly Jurassic and Carboniferous Permian. Most of the coal seams are soft coal seams with low permeability. Many mining areas have multiple periods of uplift, depression, folds and faults. The geological conditions are extremely complex under the action of stress. In some hard coal mining areas, there are local structural failures to form structural coal development, which is characterized by soft coal, poor coal seam permeability, and difficulty in gas drainage from the original coal body. Coal-bearing strata in my country mostly exist under the condition of coal seams, which extend to the deep part year by year with the increase of mining intensity. After entering the deep mining, the upper and lower coal ...

AI Technical Summary

Problems solved by technology

On April 7, 2015, the State Intellectual Property Office published an invention patent titled "Gas Drainage Method for High-Pressure Hydraulic Cavity Formation in Rock Roadways", the patent number is 201510162130.X, and the patent proposes the use of integrated drilling and stamping equipment In the rock roadway of soft and high outburst coal seams, upward or downward drilling is carried out, and at the same time, horizontal drilling is still required for coal seam drainage and mining. This traditional method has no substantial effect on the mining efficiency of the coal seam. improvement

Therefore, on the whole, although this traditional method improves the permeability of the coal seam and increases the amount of gas drainage, it pays a huge economic cost and is not suitable for the high-speed mining of modern coal seams.

Images