Gas surface drainage method for high-yield and high-efficiency working faces in low-gas mines

Abstract

The invention belongs to the technical field of coal-mine gas treatment, and particularly relates to a high-yield and high-efficiency working face gas ground mining method of a low gas mine. The problems that a coal seam is large in breathability coefficient and low in gas, a large amount of gas gushes out of a mine, a conventional underground gas mining mode has certain limit, the construction difficulty is large, the cycle is long, and the large joint pressure of digging and mining the mine is caused are solved. The method specifically comprises the following steps of 1, laying out a mining well; 2, drilling the ground, wherein (1), in primary drilling, a phi 425 mm rock bit is adopted, (2), in secondary drilling, a phi 311.1 mm drill is adopted to be drilled into a coal seam, (3), after drilling is completed, as coal mining of the working face is carried forward, and during communication between fissure zones formed in coal mining and the ground mining well, a ground mobile pump station is adopted to begin negative pressure drainage, and (4), after coal mining is conducted, a goaf is formed, and drainage continues through drilling. The method gives full play to efficient mining and short construction period of the mining mine, coal-mine gas is treated, and the production efficiency of the coal mine is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas control, and in particular relates to a method for ground gas extraction in a high-yield and high-efficiency working face of a low-gas mine. Background technique [0002] The high-yield and high-efficiency working faces of low-gas mines, due to the high intensity of comprehensive mechanized coal mining, concentrated production, and fast advancing speed, have the characteristics of increased gas emission, large quantities, and unbalanced gas emission at the mining face. , the mining area is long, and the strike length is long, so the area of ​​the gob is large, and it is easy to cause the working face and local gas (especially the upper corner) to exceed the limit. In order to relieve the ventilation pressure, the working face often adopts gas control methods such as high pumping roadways. It also caused difficulties in the connection of the working face and delayed the progress of coal minin...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of large coal seam permeability coefficient, low gas and high gushing mines, the conventional underground gas extraction mode has certain limitations, difficult construction and long cycle, resulting in high connection pressure of mine extraction and mining, and provides a low-pressure Gas surface drainage method for high-yield and high-efficiency working face in gas mine

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