A method of controlling gas in high-gas coal mining face by using well instead of roadway

Abstract

The invention discloses a method for controlling gas in a high-gas coal mining face by substituting a well for a roadway. The following steps are adopted: Step 1. Optimizing the layout of the space of the vertical well, the L-shaped ground well and the high-level drilling in the mining area location; Step 2, respectively calculate the instantaneous gas extraction volume of vertical wells in the mining area, L-shaped surface wells in the mining area, and high-level drilling holes, and obtain the instantaneous desorbable gas volume q after extraction; Step 3: Calculate the amount of coal mining work Instantaneous desorbable gas quantity q´; Step 4: Evaluate whether the measures of "replacing roadways with wells" have reached the limit and remedial measures to control high-gas coal mining face gas purpose. By adopting the method of the invention, the gas overrun problem of the coal mining face, the upper corner, and the air return roadway can be solved, and the method of "replacing the roadway with a well" is adopted for drainage to meet the requirements of controlling the gas in the coal mining face, and at the same time, the construction cost is greatly reduced .

Description

technical field [0001] The invention relates to the technical field of coal mine gas control, in particular to a method for controlling gas in a high-gas coal mining face by substituting a well for a roadway. Background technique [0002] Due to the high-intensity coal mining conditions in high-gas mines, the coal mining face and adjacent coal (rock) layers will release a large amount of gas due to the pressure relief effect of coal mining, making the coal mining face and the upper corner prone to gas If the concentration exceeds the limit, the sparks or heat sources that may be generated by coal mining machinery may cause gas explosions, which seriously affects the safety of coal mining face production. Moreover, there are potential safety hazards in the goaf after coal desorption and gas accumulation after coal mining. Contents of the invention [0003] In view of this, the object of the present invention is to provide a method for controlling gas in high-gas coal minin...

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Problems solved by technology

[0002] Due to the high-intensity coal mining conditions in high-gas mines, the coal mining face and adjacent coal (rock) layers will release a large amount of gas due to the pressure relief effect of coal mining, making the coal mining face and the upper corner prone to gas When the concentration exceeds the limit, the sparks or heat sources that may be generated by coal mining machinery may cause gas explosion, which seriously affects the safe production of coal mining face

In addition, there are potential safety hazards in goafs where residual coal desorption gas accumulates after coal mining

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