Modular extraction method based on fracturing permeability improvement of comb bottom plate perforation drill hole

Abstract

The invention belongs to the technical field of coal mine safety, and relates to a modular extraction method based on fracturing permeability improvement of a comb bottom plate perforation drill hole.Fracturing drilling is carried out in the middle of a coal roadway corresponding to a bottom plate roadway, after drilling is performed, a fracturing branch hole does not need to penetrate a coal seam, the length of a main fracture hole in the bottom plate roadway is 400-500m, the main fracture hole and the fracturing branch hole are sealed by directional drilling and subjected to hydraulic fracturing, after the hydraulic fracturing is performed, a heading end begins to move forwards, in the rear part of a heading face, a perforation pre-pumping borehole with pre-designed parameters is carried out to perform the perforation strip pre-pumping, at the same time, the comb bottom plate perforation drill hole covering two stoping faces or one stoping face to perform fracturing is carried out in a coal body bottom plate, and pipe connecting and pre-pumping is performed after the fracturing is completed. The modular extraction method based on the fracturing permeability improvement of the comb bottom plate perforation drill hole can greatly reduce heading of the bottom plate roadway, the investment of the rock roadway under the same effect is a quarter of that of an original method, theconnection tension conditions of "pumping, digging and mining" in a mine are relieved, and the mine production efficiency is improved safely and efficiently.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and relates to a modular drainage method based on comb-shaped bottom plate piercing drilling and fracturing for anti-reflection enhancement. Background technique [0002] Article 210 of the "Coal Mine Safety Regulations" stipulates that in the outburst coal seam with one of the following conditions, the strip gas in the roadway construction along the coal seam and pre-pumping coal roadway shall not be used as a regional outburst prevention measure: [0003] 1. The outburst coal seam of a new mine. [0004] 2. In the history, the outburst strength was greater than 500t / time. [0005] 3. The solidity coefficient of the coal seam within the mining area is less than 0.3; or the solidity coefficient of the coal seam is 0.3-0.5, and the buried depth is greater than 500m; or the solidity coefficient of the coal seam is 0.5-0.8, and the buried depth is greater than 600m; The depth is greater t...

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Problems solved by technology

[0008] In view of this, in order to solve the problems of difficult construction and slow progress in the existing bedding drilling technology, and the problem of large technical and economic investment in regional outburst elimination in severely outburst coal mines, the present invention provides a comb-shaped bottom plate drilling A modular drainage method for layer drilling, fracturing and anti-permeability enhancement. The present invention can greatly reduce the excavation of floor rock roadways. Under the premise of the same effect, the investment in rock roadways is a quarter of that of the original method. Hydraulic measures and directional long-hole drilling technology can effectively solve the problem of regional outburst elimination. This large-area anti-reflection and enhanced drainage technology can alleviate the tension in the connection of "pumping, excavation, and mining" in mines, and improve mine safety and efficiency. Productivity

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