Satellite hole plugging and reinjection multifunctional gas extraction hole sealing device

Abstract

The invention discloses a satellite hole plugging and reinjection multifunctional gas extraction hole sealing device. The hole sealing device comprises an extraction pipe arranged in the front-back direction in the length direction, the front end of the extraction pipe is coaxially connected with a special-shaped grouting flow guide connector, the special-shaped grouting flow guide connector is coaxially connected with an extraction reducer union, a plurality of cylindrical bags are arranged on the extraction pipe at intervals, the extraction pipe is provided with an inner slurry outlet located in each bag and an outer slurry outlet located between every two adjacent bags, hoops for fixedly connecting the bags and the extraction pipe in a sealed mode are arranged at the positions, at a front end opening and a rear end opening of each bag, of the extraction pipe, and the rear end of the extraction pipe is provided with a slag separating, air guiding and slurry blocking end. The device is used for hole sealing in the early stage, grouting and leaking stoppage in the middle stage for drilling deformation and drilling gas leakage caused by roadway stress concentration, and water injection in the later stage after coal seam drilling construction is completed, the dust falling effect is achieved on coal mining infiltration and stabilization of a coal body, one set of device has multiple purposes, and normal drilling gas extraction in the whole extraction period is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and in particular relates to a multifunctional gas drainage and sealing device for satellite hole sealing and reinjection, which is used for grouting sealing and grouting plugging after the coal seam is drilled in underground coal mines. , water injection dust. Background technique [0002] Underground coal seam gas drainage in coal mines is the main means to solve the safety problem of coal mine gas. In the coal seam gas drainage drilling and sealing, the current sealing device has low compressive strength. The transfer of the stress concentration area to the deep part of the roadway will cause the deformation of the borehole. In the light case, it will cause air leakage in the drainage borehole. Some mines adopt closed drainage boreholes to deal with borehole air leakage, and some mines directly use drilling rigs to break the original sealing device and the sealing section a...

AI Technical Summary

Problems solved by technology

[0002] Underground coal seam gas drainage in coal mines is the main means to solve the safety problem of coal mine gas. In the coal seam gas drainage drilling and sealing, the current sealing device has low compressive strength. The transfer of the stress concentration area to the deep part of the roadway will cause the deformation of the borehole. The light one will cause the drainage borehole to leak, and the serious one will directly flatten the drainage pipe, resulting in only concentration but no flow

Some mines adopt closed drainage boreholes to deal with borehole air leakage, and some mines directly use drilling rigs to break the original sealing device and the sealing section along the drilling position to seal the holes again. Such a cycle will not only directly affect the Improve the gas drainage efficiency and concentration in the later stage, and increase a lot of labor workload and capital cost

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