Hole packer for mine gas extraction

Abstract

The invention provides a hole packer for mine gas extraction, and belongs to the technical field of mine hole packers.The hole packer comprises an inner-side bag type plug and an outer-side bag type plug, grouting liquid pipes are arranged in the inner-side bag type plug and the outer-side bag type plug in a communicating mode, and the grouting liquid pipes are used for conveying grouting liquid; a middle mucus plugging section is formed between the inner side bag type plug and the outer side bag type plug, a mucus injection pipe is installed on the outer side bag type plug and used for conveying mucus, the inner end of the mucus injection pipe extends into the middle mucus plugging section, and the outer end of the mucus injection pipe extends out of the outer side bag type plug. The inner side and the outer side of the hole packer are plugged through the bags capable of being filled with solidified slurry, the middle mucus plugging section is formed between the bags at the two ends, and non-solidified mucus is injected into the middle mucus plugging section, so that the sealing effect of the hole packer on a drill hole is guaranteed, the gas extraction concentration and efficiency are improved, and safe production of a coal mine is guaranteed.

Description

technical field [0001] The invention relates to the technical field of mine hole sealers, in particular to a hole sealer for mine gas pumping. Background technique [0002] At present, the grouting type hole sealer is usually used to seal the borehole during the mine gas drainage. First class composition. When in use, the grouting pipe of the hole sealer is connected with the grouting pump, and the grouting liquid stirred in the mixing bucket enters the grouting pipe and the bladder through the grouting pump, and the bladder expands rapidly, and the outer diameter of the bladder is tightly sealed. It is fixed on the coal seam hole wall, and the holes at both ends of the hole sealer are closed; when the pressure reaches, the blasting valve explodes, and the grouting fluid fills the middle part of the two bladders, thereby realizing multi-layer sealing, and connecting them through the gas drainage pipe The gas drainage pipeline is used for gas drainage. The grouting fluid i...

AI Technical Summary

Problems solved by technology

[0003] However, since the cross-sectional shape of the borehole is divided into a broken zone, a plastic zone, and an elastic curve sequentially from the hole wall to the inside of the coal seam, and there are irregular cracks in the broken zone and the plastic zone, the grouting fluid of the existing grouting type hole sealer It cannot penetrate into these fractures well, and the distribution and development of fractures in the coal (rock) mass around the drill hole change with time, but the grouting fluid will solidify after a period of time and cannot penetrate into the newly generated fractures. The existing grouting type hole sealer has a poor sealing effect on the middle section, which will cause problems such as poor sealing, gas leakage, and short circuit in the gas extraction process, so that the concentration of the gas extraction is not high. The expected gas drainage effect cannot be achieved, thus affecting the safe production of coal mines

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