Drilling gas extraction method capable of preventing damage to ground

A surface drilling and gas drainage technology, which is applied in the direction of gas discharge, earthwork drilling, drilling equipment, etc., can solve the problems of high cost, difficulty in L-shaped drilling construction, damage, etc., achieve high safety and improve gas drainage The effect, the effect of high economic value

Active Publication Date: 2020-12-01
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] The invention aims at the problems that the vertical drilling on the ground is easy to be damaged due to the shifting of the working face, and the construction of the L-shaped drilling is difficult and costly, and provides an anti-destructive ground drilling gas drainage method

Method used

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  • Drilling gas extraction method capable of preventing damage to ground

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Embodiment Construction

[0016] Before the coal seam is mined, start drilling at a distance of 3-5m from the edge of the surface mobile basin 2 near the return airway side 6 above the mined coal seam 8, and use a 241.3mm drill bit to drill vertically down to 30-50 m above the mined coal seam fissure zone 4 Stop at 50 m, then go down into the vertical rigid pipe 3; then make an inclination in the direction of 40-60° in the return airway, from the upper boundary line 9 of the mining coal seam collapse zone and the mining stress boundary on the side of the return airway 6 The junction of line 1 enters the mining coal seam fissure zone 4, and passes through the mining coal seam fissure zone 4 to enter the mining coal seam caving zone 7, so that the bottom of the drilling well is located in the range of 10-40 m from the inner return airway and enters the floor of the mining coal seam 8; The drilling section inclined to the junction of the upper boundary line 9 of the mining coal seam caving zone and the min...

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Abstract

The invention discloses a drilling gas extraction method capable of preventing damage to the ground, and belongs to the technical field of coal mine gas extraction methods. The problems that ground vertical drilling is prone to damage due to displacement of a working face, the L-shaped drilling construction difficulty is large, and cost is high can be solved, before coal seam mining, drilling is conducted from the position 3 to 5 m away from the edge of the ground surface, of a basin, vertical downward drilling is conducted to the position 30 to 50 m away from the upper part of a fissure zone,and a vertical rigid pipe is lowered into the position; deflecting is inwards conducted in the direction away from an air return roadway by 40-60 degrees; and deflecting is started to a drilling section at the junction of the upper boundary line of a caving zone and the mining-induced stress boundary line of the air return roadway side, a flexible sleeve is lowered into the drilling section, a flexible screen pipe is lowered into a drilling section from the junction of the upper boundary line of the caving zone and the mining-induced stress boundary line of the air return roadway side to a bottom plate of the mining coal seam, and a ground wellhead is connected with a drainage pump station. The problem of damage of working face advancing to ground extraction drilling is solved to a certain extent, and the drilling stability is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of gas extraction methods in coal mines, and in particular relates to an anti-destructive ground drilling gas extraction method, which is used for gas pre-extraction in mining coal seams and gas extraction in mining areas and goaf areas. Background technique [0002] The mining depth of my country's coal mines has increased year by year, and the requirements and difficulties of gas control have also increased. In the research practice of gas control, surface gas drainage drilling is one of the effective methods in the field of coal mine gas control engineering. Utilizing the drainage function of drilling , to extract more gas and effectively reduce the pressure of gas exceeding the limit in the underground working face. The ground gas drainage drilling mainly adopted in my country at the present stage includes surface vertical drilling and L-shaped gas drainage drilling. Among them, the ground vertical drill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B7/04E21B17/20E21B43/08
CPCE21F7/00E21B7/04E21B17/20E21B43/086
Inventor 胡胜勇武登宇李超冯国瑞胡岚清郭化博
Owner TAIYUAN UNIV OF TECH
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