A Method for Eliminating Excessive Prominence of Gas Explosion in Coal Mine

A coal mine gas and coal seam gas technology, which is applied in the field of eliminating coal mine gas explosions exceeding the standard, to achieve the effects of reducing coal seam gas content, reducing prevention and control costs, and reducing the amount of drainage engineering

A coal mine gas and coal seam gas technology, which is applied in the field of eliminating coal mine gas explosions exceeding the standard, to achieve the effects of reducing coal seam gas content, reducing prevention and control costs, and reducing the amount of drainage engineering

CN106437823BActive Publication Date: 2020-02-14湖州优研知识产权服务有限公司
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Embodiment Construction

[0030] The present invention will be further described below in conjunction with specific embodiments.

[0031] Ground drilling and drainage of coal seam gas for coal mine gas prevention and control can achieve three results in one fell swoop: improving coal mine safety production conditions, providing clean gas energy, and reducing greenhouse gas emissions. However, the current ground drainage in accordance with the "drilling-fracturing-drainage-reduction-gas extraction" technical model has low gas production and cannot effectively reduce the gas content of coal seams. This is because most coal seams in China and the world There are three characteristics: (1) The original permeability is low or very low, usually less than 1 millidarcy; in Henan and other places in China, the original permeability of coal seams is usually only tens of micro-Darcy, and some even as low as a few micro-Darcy . This is 1 to 4 orders of magnitude lower than the permeability of coalbed methane reservo...

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Abstract

Provided is a coal mine gas prevention method for eliminating coal mine gas explosion, burst and exceeding by injecting nitrogen from the ground to discharge and mine coal bed gas. The method comprises the steps that wells are drilled from the ground, the high pressure nitrogen is injected into one or more coal beds from the multiple nitrogen injection wells, desorbing of the coal bed gas is reinforced, the desorbed gas is driven to be transported to the production wells from the nitrogen injection wells, the gas or mixed gas of the gas and the nitrogen is obtained from the multiple production wells, the coal bed gas content is decreased, the risks of coal mine gas explosion, burst and exceeding are eliminated, the utilization rate of the coal mine gas is increased, the gas discharged to the atmosphere during coal mine mining is reduced, and the atmosphere environment is protected. By adoption of the method, the coal bed gas content can be effectively decreased to be lower than the residual gas content set according to the coal mining safety requirements, and the gas produced by the production wells through the method can be fully utilized basically.

Description

Technical field [0001] The present invention relates to a ground nitrogen injection and drainage coal seam gas prevention method to eliminate coal mine gas explosion, outburst, and coal mine gas exceeding the standard. Specifically, the invention relates to a gas injection well (hereinafter referred to as "injector "Gas well") injects high-pressure nitrogen into the coal seam, collects produced gas from production wells (hereinafter referred to as "production wells") drilled through the coal seam, enhances the effect of coal seam gas drainage on the ground, and reduces the coal seam gas content to far below specifications The required level is to eliminate coal mine gas explosion, outburst, and exceed the standard, improve the utilization rate of coal mine gas, and protect the atmospheric environment. Background technique [0002] Gas is a gas that exists in underground coalbed methane, and its main component is a combustible hydrocarbon gas that is deposited on the surface of co...

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Application Information

Patent Timeline
14 Feb 2020
Publication
CN106437823B
IPC
E21F7/00
CPC
E21F7/00
Inventors
陈信平