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Drainage method of gas in coal bed

A technology for coal seam gas and coal seam, which is applied in the field of coal mine and gas seam mining, can solve the problems of long time required for gas drainage, slow gas drainage, and inflexible direction, and saves labor and consumption. Efficient drainage and improved safety effect

Inactive Publication Date: 2011-06-08
CHINA UNITED COALBED METHANE NAT ENGRES CENT +1
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Problems solved by technology

At present, a common method of coal seam gas drainage is to drill horizontal holes on the roof of the coal seam under the mine. The speed is very slow and the efficiency is extremely low; another method is to open an auxiliary roadway on the coal seam floor first, and then mine the upper high-gas coal seam. Higher, and the time required for gas extraction is also longer

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  • Drainage method of gas in coal bed

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Embodiment Construction

[0017] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] Embodiment 1 of the present invention provides a coal seam gas drainage method, see figure 1 , the method includes:

[0019] 11: Drilling at least one horizontal well from the ground toward the coal seam roof, each of said horizontal wells having a drainage section within said coal seam roof;

[0020] 12: Perform fracturing treatment on the drained part of each horizontal well to form fractures, which penetrate the roof of the coal seam and extend into the coal seam;

[0021]...

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Abstract

The invention discloses a drainage method of gas in a coal bed, and relates to the technical field of exploitation of coal mines and coal gas beds. By the drainage method, the gas can be rapidly and efficiently drained, the effect of coal-bed gas pressure can be lowered, and the safety of the coal mine operation is greatly improved. The technical scheme provided by the embodiment of the invention has lower cost, and manual work and energy consumption are saved. The drainage method provided by the invention comprises the following steps: drilling at least one horizontal well from the ground surface to the roof of the coal bed, wherein, each horizontal well has a drainage part positioned on the roof of the coal bed; carrying out fracture treatment on the drainage part of each horizontal well to form a crack which penetrates through the roof of the coal bed downwards and extends into the coal bed; and draining the gas in the coal bed by utilizing the crack.

Description

technical field [0001] The invention relates to the technical field of mining of coal mines and coal gas beds, in particular to a method for draining coal bed gas. Background technique [0002] Gas refers to a kind of unconventional natural gas (its main component is methane) stored in coal seams. It is a harmful gas that is emitted automatically during coal mining. Explosive features. When the gas concentration in the air reaches between 5% and 16%, it will explode in case of an open flame. Among the accidents in my country's coal mines, gas accidents can be said to account for more than 70% of all accidents. Gas is one of the major hidden dangers of coal mine safety. [0003] Therefore, when mining high-gas coal seams or coal mines, it is necessary to drain the gas first. At present, a common method of coal seam gas drainage is to drill horizontal holes on the roof of the coal seam under the mine. The speed is very slow and the efficiency is extremely low; another met...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 鲜保安曹代功王德桂毛志新邓均耀彭宏钊毕延森纪元吴沛洋
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
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