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

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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Problems solved by technology

[0005] Although the technology of injecting gas into the coal seam to increase the production of coal seam gas has been disclosed for nearly three decades, and although the practice of ground drainage of coal seam gas has existed for several years, so far no one has combined these two technologies for coal mine gas control

This is because (1) although the patent of gas injection to increase the production of coalbed methane has been proposed for more than 20 years, it has not been used by the coalbed methane development industry so far, and it is rarely known; (2) to complete this combination, it is necessary to be familiar with both coalbed methane development and coal mines The current situation, demand and technology of the two fields of gas prevention and control belong to cross-industry innovation; (3) It is necessary to innovate and develop the existing gas injection technology to increase production of coalbed methane, and it is necessary to innovate the existing coalbed gas ground drainage; (4) Innovative technology must improve the safety level of coal mine gas prevention and control to ensure coal mining safety