Segmented composite coal-drawing method for surface horizontal wells

Abstract

The invention relates to a coal digging method, which belongs to the technical field of coal mining, in particular to a segmented and compound coal dredging method for a surface horizontal well. The present invention deploys an L-shaped horizontal well on the ground to carry out coal digging, pressure relief and outburst elimination, and solves the time and space excavation-pumping contradictions in the coal mine roadway development process; the present invention uses a segmented water / aerodynamic composite coal digging method to improve low air permeability The amount of coal taken out of horizontal wells in permanent coal seams can be increased, the pressure relief space of horizontal wells can be increased, and the time for outburst elimination to reach the standard can be shortened, so as to achieve the purpose of regional stripping and advanced pressure relief and outburst elimination.

Description

technical field [0001] The invention relates to a coal digging method, which belongs to the technical field of coal mining, in particular to a segmented and compound coal dredging method for a surface horizontal well. Background technique [0002] Coal and gas outburst is one of the main disasters that affect the safe production of coal mines. Before developing roadways in broken, soft and strong outburst coal seams, it is first necessary to solve the problem of coal and gas outbursts in roadway excavation. Layer-piercing holes are used to dig out coal to relieve pressure and eliminate outbursts (the total amount of coal pulled out is measured by 3‰ in the affected area). This method has formed a mature supporting process technology and is widely used in coal mining areas across the country. However, there are the following limitations in practical application: (1) The underground space is limited, the construction conditions of rock roadway excavation are poor, the constru...

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Problems solved by technology

However, there are the following limitations in practical application: (1) The underground space is limited, the construction conditions of rock roadway excavation are poor, the construction is difficult, and the construction time is long, resulting in high comprehensive construction costs; (2) The construction technology of underground piercing holes is limited , the construction aperture is small and the scope of influence is small, so it is necessary to arrange a large number of coal digging holes through layers to achieve the effect of roadway strip pressure relief and outburst elimination; (3) For low-permeability coal seams, underground coal digging needs to be planned and deployed a long time in advance and construction, the contradiction between stubbornness and pumping is very prominent, which seriously affects the safe and efficient excavation of mine roadways

[0003] To sum up, there are problems such as large construction workload, high difficulty, high cost, low extraction efficiency, long drainage time, and prominent contradictions in time and space in the extraction of coal holes in the bottom extraction roadway. It is difficult to achieve the goal of rapid and large-scale strip pressure relief and outburst elimination, which seriously affects the safe and efficient excavation of coal mine roadways

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