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A kind of anti-destructive ground drilling gas drainage method

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

Active Publication Date: 2022-04-15
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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  • A kind of anti-destructive ground drilling gas drainage method

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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

An anti-destructive ground drilling gas drainage method belongs to the technical field of coal mine gas drainage methods, which can solve the problems that the ground vertical drilling is easily damaged due to the movement of the working face, and the construction of L-shaped drilling is difficult and costly. Before coal seam mining, Spud drilling from 3‑5 m outside the edge of the surface mobile basin, drill vertically downward to stop at 30‑50 m above the fractured zone, and then go down into a vertical rigid pipe; inwardly stagger the direction of 40‑60° return airway Deviation; the drilling section from the beginning of deflection to the junction of the upper boundary line of the collapse zone and the mining stress boundary line on the side of the return airway is run into the flexible casing, and the upper boundary line of the collapse zone and the mining stress boundary on the side of the return airway The flexible screen pipe is lowered into the drilling section from the junction of the line to the floor of the mining coal seam, and the surface wellhead is connected with the pumping station. The invention solves to a certain extent the problem of damage to surface drainage drilling caused by advancement of the working face, and greatly improves drilling stability.

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...

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Application Information

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Patent Type & Authority Patents(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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