A coal seam pulsating water injection drilling hole sealing device and hole sealing method

Abstract

The invention provides a coal seam pulse water injection drilling sealing device and a hole sealing method, which relate to the technical field of drilling water injection. The sealing device includes a grouting pipe, an aqueduct, a one-way valve, a first water injection capsule, a second water injection capsule and a sealing Capsules, water injection drilling holes are sequentially provided with a first water injection capsule, a second water injection capsule and a sealing capsule from outside to inside, the grouting pipe passes through the outlet of the first water injection capsule between the first water injection capsule and the second water injection capsule, and the water injection pipe After passing through the first water injection capsule to reach the second water injection capsule, the one-way valve is set at the outlet of the grouting pipe, and the sealed capsule is evenly equipped with particles whose particle size gradually becomes larger to form a progressive buffer layer; use this device to seal holes When pulsating water injection, the pressure of the water flow progressive buffer layer is gradually relieved, thereby reducing the impact of variable water pressure on the sealing material, ensuring the sealing performance of the drilling, and preventing the sealing material from fatigue damage due to pulsating water injection pressure. Lead to advantages such as borehole sealing failure.

Description

technical field [0001] The invention relates to the technical field of drilling water injection, in particular to a drilling sealing device for pulsating water injection in coal seams and a method for sealing holes using the device. Background technique [0002] In the underground production of coal mines, various processes of mining, excavation, and transportation will generate a large amount of dust. With the rapid development of high-power mining and excavation machinery, the dust concentration of coal mining and excavation working faces has increased significantly. The dust generated will not only pollute the working environment and cause damage to various mechanical equipment, but also cause harm to the health of the staff. In order to reduce the dust production from the source, the coal seam water injection dust reduction technology is often used underground in coal mines. This technology increases the water content of the coal body by drilling-sealing-water injection ...

AI Technical Summary

Problems solved by technology

However, in the process of pulsating water injection, the pulsating water pressure not only has the effect of fatigue damage-cracking on the coal body, but also has the same effect on the sealing material. The traditional cement sealing material is very easy to produce cracks and cause the hole sealing to fail.

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