A Secondary Hole Sealing Method for Dealing with the Fractured Area of ​​Drilling Through Layers

Abstract

The invention discloses a secondary hole sealing method for treating a broken area after extraction of a crossing hole, and belongs to the methods for improving gas extraction concentration in a bedding hole. The secondary hole sealing method is especially suitable for the broken area after the extraction of the crossing hole. The bedding hole is sealed for the first time, and a first-time drilled hole sealing section is formed. Under the action of air pressure of an underground air compression system, a solid particle conveyor conveys solid particles into the bedding hole through a material blowing pipe. The underground air compression system is connected with the material blowing pipe, and air is compressed into the hole for a while. In the process of blowing the solid particles into the hole, the solid particles initially plug the fractures, caused by the crossing hole, of the broken area after the extraction around the bedding hole, and hole air leakage is reduced. The air is compressed by the underground air compression system through the material blowing pipe, the solid particles in the hole are further blown into the fractures of the broken area after the extraction, then the hole air leakage is reduced, the bedding hole high concentration gas extraction period is prolonged by more than one month, the hole use ratio is improved, and coal recovery safety is guaranteed.

Description

technical field [0001] The invention relates to a hole-sealing method, in particular to a secondary hole-sealing method for treating broken areas after drilling through layers. Background technique [0002] The Pingdingshan mining area is one of the 13 large-scale coal bases and 45 key safety monitoring mining areas in the country. . In 2010, the output reached 48.5 million tons (ranking 3rd among similar mining areas in the country), of which the output of outburst coal seams accounted for 70%. The mining depth generally exceeded 600m, and the maximum mining depth reached 1200m. Mining areas are rich in gas associated resources, high in coal seam gas content, high outburst risk, and low coal seam permeability. With the continuous increase of mining depth, mining conditions are becoming more and more complex, and mine gas has become a key issue restricting safe production. The occurrence conditions of coal seams in the Pingdingshan mining area are very complicated, and the...

AI Technical Summary

Problems solved by technology

The biggest problem in coal seam mining is: the distance between coal seam groups is long, the distance between coal seams within a group is short, and the mining conditions for protective seams are not met.

Due to the existence of the broken area after the drilling of the cross-layer drilling, under the action of the negative pressure of the drainage, the air in the roadway passes through the cracks in the broken area after the drilling of the cross-layer drilling and enters the inside of the drilling along the bedding, resulting in serious air leakage in the drilling, and the concentration of gas drainage Fast attenuation shortens the effective period of gas drainage and reduces the utilization rate of drilling holes

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