Long and short hole crossed coal seam water injection method

Abstract

The invention discloses a long and short hole crossed coal seam water injection method. The method specifically comprises the following steps of 1, drilling construction; 2, water injection drilling and hole sealing; and 3, coal seam water injection. According to the method, long and short hole crossed coal seam water injection is utilized, a coal body is wetted in advance, the coal dust generation amount is reduced, water is uniformly injected into the coal body, the water content reaches 4% or above, outburst accidents are prevented, the mechanical property of coal is changed, stress distribution is homogenized, the elastic energy release speed is decreased, the power is reduced, and the gas emission speed is reduced; after coal seam water injection is implemented, respirable dust and total dust are greatly reduced, and the maximum dust fall rate reaches 50% to 80%; and after water injection, the initial speed of drilling gas emission is basically eliminated, the measured value is obviously reduced, the inhibition and analysis effect after water injection is reflected, the gas emission amount is reduced by 30% to 70%, and the gas emission speed is reduced by 35% to 40%.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a water injection method with long and short holes intersecting coal seams. Background technique [0002] Coal seam water injection is to inject pressurized water into the coal seam through drilling holes, so that it can penetrate into the coal body, destroy the balance of the original coal-gas two-phase system in the coal body, and form a coal-gas-water three-phase system. It is a technical measure to change the physical and chemical properties, mechanical properties and thermodynamic properties of coal, make the coal seam pre-wet, increase the moisture of the coal body, and reduce the generation of dust during coal mining. The personal safety and mine safety of operators who have been working in this environment for a long time pose a great threat, and coal seam water injection is the most fundamental and effective measure to reduce the generation of dust in coa...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a long and short hole intersecting coal seam water injection method to solve the problem in the prior art that the coal body cannot be fully wet due to the increasing difficulty of coal seam water injection

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