Dual-purpose hole sealing device for gas extraction and coal seam water injection and using method thereof

Abstract

The invention discloses a dual-purpose hole sealing device for gas extraction and coal seam water injection and a using method thereof. The dual-purpose hole sealing device consists of an extraction tube / water injection tube, a high-elasticity rubber tube, an integrated type elastic bag which is formed by inside and outside sealing elastic bags and a connecting tube thereof, and a grouting tube, wherein the extraction tube / water injection tube passes through the rubber tube, and is in sealing connection to two ends of the rubber tube; the water inlet tube and a water drainage tube are separately equipped with a switch and a one-way valve; the integrated type elastic bag covers the rubber tube; the grouting tube passes through the inside and outside sealing elastic bags which are in sealingconnection to the grouting tube, one-way valves are arranged in the inside and outside sealing elastic bags, and explosion valves are arranged between the inside and outside sealing elastic bags. Theusing method for the dual-purpose hole sealing device comprises the following steps: injecting water, grouting, grouting towards a grouting space through the explosion valves, stopping grouting, re-injecting water before slurry is solidified to keep water pressure constant, and taking out the extraction tube and the rubber tube to repeatedly use after gas extraction or water injection is accomplished. The dual-purpose hole sealing device can completely remove gas in the grouting space, eliminates appearance of drilling cracks and increases a crack sealing range in drilling surrounding rock bykeeping grouting pressure constant, and increases gas extraction amount or improves water injection effect.

Description

technical field [0001] The invention relates to a hole sealing technology for underground gas drainage and coal seam water injection in coal mines, in particular to a dual-purpose sealing device for gas drainage and coal seam water injection and a use method thereof. Background technique [0002] Gas drainage is the main measure to prevent and control coal and gas outbursts, gas explosions and other gas disasters, and its drainage efficiency and prevention effect are affected by the quality of sealing holes. Coal seam water injection can not only prevent mine disasters such as rock burst, coal and gas outburst, but also reduce the amount of dust in the air flow of underground roadways and improve the mine operating environment. The prevention effect is also affected by the quality of hole sealing. Therefore, hole sealing is a key technology affecting coal seam gas drainage and water injection. [0003] For gas drainage or water injection drilling, there are mainly two types...

AI Technical Summary

Problems solved by technology

Although this hole sealer can discharge the air and water in the grouting section through the filter cloth and the discharge hole from the extraction pipe, there are still the following defects in actual use: ①Under the action of the grouting pressure, too much water in the grout will flow from The discharge of the extraction pipe reduces the fluidity of the slurry, reduces the amount and range of penetration into the cracks in the surrounding rock of the borehole, and reduces the plugging effect on the second type of air leakage or water leakage channel; ②Increase of grouting pressure , so that the drill hole is enlarged, so that there is a gap between the front pocket and the drill hole wall, which reduces the sealing effect of the first air leakage or water leakage channel; ③The parts of the hole sealer cannot be reused, and the sealing cost is relatively high

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