A dual-purpose sealing device for gas extraction and coal seam water injection and method of using the same

Abstract

A dual-purpose sealing device for gas drainage and coal seam water injection and its use method, the device is composed of a drainage pipe / water injection pipe, a high elastic rubber pipe, an integrated elastic bladder composed of internal and external sealing elastic bladders and connecting pipes Composed of bags and grouting pipes; the extraction pipe / water injection pipe passes through the rubber pipe and is sealed at both ends; the water inlet pipe and the drain pipe are respectively equipped with a switch and a one-way valve; the rubber pipe is wrapped in an integrated elastic bag; the grouting pipe Pass through the inner and outer sealing elastic capsules sealedly connected with it, and there is a one-way valve in the inner and outer sealing elastic capsules, and a burst valve is arranged between the inner and outer elastic capsules. Its usage methods include water injection, grouting, grouting into the grouting space through the blasting valve, stopping the grouting, refilling the water before the grout solidifies to keep the water pressure constant, taking out the extraction pipe and the rubber pipe for reuse after the completion of gas drainage or water injection . The invention can completely eliminate the gas in the grouting space, reduce the occurrence of borehole fissures by keeping the grouting pressure constant, increase the sealing range of fissures in the surrounding rock of the borehole, and improve the gas extraction volume or 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

Images