Method for integrated comprehensive management of gas in low-permeability single coal bed

Abstract

The invention relates to a method for integrated comprehensive management of gas in a low-permeability single coal bed, which can effectively solve the problem of comprehensive management and utilization of the gas. A technical scheme of the method comprises the following steps of: firstly, drilling holes, wherein a high-torque drilling machine and a rifle or a trihedral drill stem are used for solving the phenomenon of clamping the drill stem caused by collapsing and jetting of the holes in the hole drilling process; and then, performing hydraulic fracturing permeability improvement on the coal body, drilling holes for pre-split blasting, performing gas drainage, and recycling the drained gas, thereby implementing the integrated management of the gas. With the method provided by the invention, the permeability of the coal body is improved, a pre-draining rate of the gas is improved, and the drained gas is recycled, so that the drilled holes are radically prevented from being blocked in the construction process, the problem of difficulties in draining the gas in the low-permeability coal bed with a drilling tool having insufficient capability in the drilling construction is solved, consequently, outburst risk of the coal and the gas is reduced, outburst accidents of the coal and the gas are reduced and even avoided, and mine production safety and lives of coal mine workers are ensured, so that the method brings great economic and social benefits.

Description

1. Technical field [0001] The invention relates to gas prevention and utilization, in particular to a method for integrated gas comprehensive control in a low-permeability single coal seam. 2. Background technology [0002] Coal and gas outburst is one of the serious natural disasters in the process of coal mining. It is an extremely complicated dynamic force of the coal and rock mass around the mining face being rapidly broken, accompanied by coal and rock being thrown or moved to the roadway, and a large amount of gas gushing out. Phenomenon, it will cause casualties and the destruction of mechanical and electrical equipment in the shaft, damage the mine ventilation system, and easily cause gas explosion and fire accidents in the process of coal and gas outburst. Our country is one of the countries with the worst disasters. Up to now, outbursts have occurred in some mines in 20 provinces and regions in my country. There are more than 250 outburst mines in state-owned coal...

AI Technical Summary

Problems solved by technology

[0005] In view of the above situation, the purpose of the present invention is to provide an integrated method for comprehensive management of gas in a single coal seam with low permeability, which can effectively solve the problem of comprehensive gas prevention and utilization

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