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Method for integrated comprehensive management of gas in low-permeability single coal bed

A technology for comprehensive treatment of coal seam gas, which is applied in the field of comprehensive treatment of low-permeability single coal seam gas

Inactive Publication Date: 2011-07-13
平顶山天安煤业股份有限公司十矿
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Problems solved by technology

[0005] In view of the above situation, the purpose of the present invention is to provide an integrated method for comprehensive management of gas in a single coal seam with low permeability, which can effectively solve the problem of comprehensive gas prevention and utilization

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  • Method for integrated comprehensive management of gas in low-permeability single coal bed

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Embodiment Construction

[0012] The specific implementation manners of the present invention will be described in detail below in conjunction with specific conditions and accompanying drawings.

[0013] The present invention is implemented by the following steps in implementation:

[0014] (1) Drilling, the method is to use a drilling rig with a torque of 2000-6200KN to improve the drilling construction capacity, and use a double-line or a triangular drill pipe. The drill pipe is evenly distributed with grooves with a depth of 2mm and a width of 10mm. The drill pipe drilling can effectively solve the phenomenon of drill pipe clamping caused by hole collapse and spray hole during the drilling construction process. The structure of the drill pipe is as follows: figure 1 shown.

[0015] (2) The hydraulic fracturing of the coal body increases the permeability. The method is to seal the hole with a ￠50mm seamless steel pipe, cement mortar, and polyurethane after the hole is drilled. The length of the hole...

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Abstract

The invention relates to a method for integrated comprehensive management of gas in a low-permeability single coal bed, which can effectively solve the problem of comprehensive management and utilization of the gas. A technical scheme of the method comprises the following steps of: firstly, drilling holes, wherein a high-torque drilling machine and a rifle or a trihedral drill stem are used for solving the phenomenon of clamping the drill stem caused by collapsing and jetting of the holes in the hole drilling process; and then, performing hydraulic fracturing permeability improvement on the coal body, drilling holes for pre-split blasting, performing gas drainage, and recycling the drained gas, thereby implementing the integrated management of the gas. With the method provided by the invention, the permeability of the coal body is improved, a pre-draining rate of the gas is improved, and the drained gas is recycled, so that the drilled holes are radically prevented from being blocked in the construction process, the problem of difficulties in draining the gas in the low-permeability coal bed with a drilling tool having insufficient capability in the drilling construction is solved, consequently, outburst risk of the coal and the gas is reduced, outburst accidents of the coal and the gas are reduced and even avoided, and mine production safety and lives of coal mine workers are ensured, so that the method brings great economic and social benefits.

Description

1. Technical field [0001] The invention relates to gas prevention and utilization, in particular to a method for integrated gas comprehensive control in a low-permeability single coal seam. 2. Background technology [0002] Coal and gas outburst is one of the serious natural disasters in the process of coal mining. It is an extremely complicated dynamic force of the coal and rock mass around the mining face being rapidly broken, accompanied by coal and rock being thrown or moved to the roadway, and a large amount of gas gushing out. Phenomenon, it will cause casualties and the destruction of mechanical and electrical equipment in the shaft, damage the mine ventilation system, and easily cause gas explosion and fire accidents in the process of coal and gas outburst. Our country is one of the countries with the worst disasters. Up to now, outbursts have occurred in some mines in 20 provinces and regions in my country. There are more than 250 outburst mines in state-owned coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/00E21B33/13E21B43/17E21B43/263E21B17/22
Inventor 张福旺黄励新朱同功张广彦徐森
Owner 平顶山天安煤业股份有限公司十矿
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