Method for networked preponderant gas migration channel construction and gas flow guiding extracting

Abstract

The invention discloses a method for networked preponderant gas migration channel construction and gas flow guiding extracting, and the method is especially suitable for active construction of a networked crack channel inside a top plate and gas flow guiding treatment under the condition that the hard top plate directly covers a coal bed. According to the method, a crack generation hole, a crack guiding development hole, a lateral fracturing hole and a crack communicating hole are constructed in the top plate correspondingly in the interior, on the two sides of the front working face of an advance stress variation area, of a roadway. Active construction is conducted inside the hard top plate to form manual guiding cracks. Under the effect of mining-induced stress, the manual guiding cracks and mining-induced cracks are interwoven and pass through mutually to form a networked preponderant gas migration channel. Meanwhile, the manual guiding cracks are drilled to accelerate fracturing of the top plate to form a top plate fracturing separation layer crack area. Gas flows and migrates timely and efficiently along the networked crack channel and is enriched in the top plate fracturing separation layer crack area. Manual guiding crack drilling provides reference for the construction orientation of top plate gas extracting hole drilling, so that gas flow guiding treatment of the mining field is more concentrated and efficient.

Description

technical field [0001] The invention relates to a networked advantageous gas migration channel construction and gas diversion extraction method, and is especially suitable for the active construction of networked crack channels inside the roof and the gas diversion control under the condition of directly covering a hard roof above a coal seam. Background technique [0002] The occurrence conditions of underground coal seams in my country are complex, and the occurrence conditions of the roof and floor of coal seams affect the distribution of stope stress and the evolution of cracks in coal and rock formations, thereby affecting the migration law and flow direction of mining gas. When there is a hard roof directly covered with a thick layer, it is difficult to form crack channels in the roof only by the action of mining stress due to the difficulty in the formation and evolution of hard and dense cracks in the roof. Large-area suspended roofs, the crack channels and abscissio...

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The purpose of the present invention is to overcome the deficiencies in the prior art and provide a simple, active, scientific and efficient solution that can effectively solve the difficulties in cracks in the thick and hard roof and the difficulty of gas accumulation in the goaf along the superiority. Advantages of Networking for Flow Convergence of Migration Channels, Difficult Gas Diversion and Other Problems Construction of Gas Migration Channels and Gas Diversion Drainage

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