In-advance outburst elimination method for ground of full working face of coal mine hard roof

Abstract

The invention relates to an in-advance outburst elimination method for the ground of a full working face of a coal mine hard roof. The in-advance outburst elimination method comprises the following steps that well drilling parameters and fracturing construction parameters are designed according to information and data collected in early-stage site construction; a directional drilling rig is arranged on the ground corresponding to a certain working face of a coal mine and used for drilling a horizontal well towards the preset position of the hard roof, and a horizontal section of the horizontalwell is subjected to barefoot well completion; equipment required by segmented fracturing construction of the horizontal well is arranged in a well-drilling well field; and the barefoot horizontal section of the horizontal well is subjected to segmented fracturing construction, so that cracks are fully distributed on the hard roof of the whole working face, and accordingly, the purpose of in-advance outburst elimination of the ground of the full working face of the coal mine hard roof is achieved. According to the in-advance outburst elimination method, the multiple cracks can be manufacturedin the same horizontal plane of the hard roof overall, the structure of the whole working face roof is destroyed, in-advance outburst elimination is achieved, and the overall effect is significant.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and in particular relates to a ground outburst elimination method in advance on the whole working face of a hard roof in a coal mine. Background technique [0002] In coal mining, if there is a hard roof, it will cause serious deformation of the rock mass, severe occurrence of advanced mine pressure, and rock burst and other disasters. The hard roof collapses suddenly when the overhang area is large after the coal seam is mined. Before the 1980s, some coal mines in my country usually used the knife pillar mining method to manage the hard roof. After a certain distance was mined, a certain area of ​​coal pillars were left in the goaf to support the roof. Using this method can basically ensure that the roof does not collapse during the mining of the working face. However, with the continuous expansion of the mining area, the stress of the remaining coal pillars will gradually increase, an...

AI Technical Summary

Problems solved by technology

[0005] The blasting roof control technology has the following defects: a large amount of pyrotechnics is used, and there are potential safety hazards in the transportation process; a large amount of toxic and harmful gases are generated after use, which seriously threatens the life safety of the workers and increases the probability of workers suffering from occupational diseases; The vibration generated by the roof will damage the support of the working face and the ground

[0006] Although the directional hydraulic fracturing technology in the roadway can eliminate the outburst in advance, it still has the following defects: the footage length is invalid at the predetermined position of the hard roof, and it is necessary to drill inclined wells in the roadway; it is necessary to densely arrange wells on both sides of the roadway working face. High cost; during fracturing construction, a directional grooving process needs to be added before each fracturing, resulting in a prolonged construction period; single well footage is short, which cannot solve the deep problem of the working face, nor can it solve the outburst problem of the entire working face

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