Method for pumping gas of protected layer by layer penetration and hole drilling on high-position drilling fields of protecting layer machinery tunnel

Abstract

Provided is a method for pumping gas of a protected layer by layer penetration and hole drilling on high-position drilling fields of a protecting layer machinery tunnel. The high-position drilling fields are arranged in the protecting layer machinery tunnel at intervals, a plurality of layer-penetration drilled holes which are in three rows and penetrate through the protected layer are arranged towards the protected layer in each high-position drilling field, and after hole drilling in each high-position drilling field is finished, the holes are sealed, and a gas pumping pipe is connected to pump the gas. The method is suitable for gas exploiting in a protected layer exploiting technology, the gas of a protected layer can be pre-pumped prior to exploiting of a protecting layer, and the pressure-releasing gas of the protected layer is pumped after the protecting layer is exploited. The method is simple, can reduce construction cost, shortens exploiting cycle, eliminates potential safety hazards, and facilitates safety management.

Description

technical field [0001] The invention relates to a gas drainage technology, in particular to a method for drilling gas in a protected layer through layer drilling in a high-level drilling field of a protective layer machine roadway. Background technique [0002] "Regulations on the Prevention and Control of Coal and Gas Outburst" stipulates that regional outburst prevention measures must be taken in outburst coal seams, and the protection layer mining technology is a major regional outburst prevention measure, which involves two coal seams, the protective layer and the protected layer. The coal seam that is first mined to eliminate the outburst danger of the adjacent coal seam (protected seam) is called the protective seam; due to the mining function of the protective seam and the simultaneous extraction of pressure relief gas, the adjacent outburst dangerous coal seam can be transformed into no outburst danger The coal seam, the protruding dangerous coal seam is called the p...

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Problems solved by technology

However, this method requires a large amount of engineering, high investment costs, and a long construction period, which not only increases the cost but also affects the mining cycle; the gas entering the roadway along the cracks may cause the gas concentration in the floor rock roadway to exceed the limit, resulting in difficulties in the daily management of the floor roadway ,There are security risks

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