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Super-high seam coal face hydraulic fracturing coal mining method

A coal mining face and hydraulic fracturing technology, which is applied in the field of hydraulic fracturing coal seams, can solve the problems of hard-to-break coal and low recovery rate, so as to improve recovery rate, avoid blind spots, and reduce the degree of top-coal caving Effect

Inactive Publication Date: 2020-01-21
伊犁永宁煤业化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a hydraulic fracturing coal mining method for coal mining working faces in extra-thick coal seams, which solves the technical problems in the prior art that the coal body at the top of the coal mining face is difficult to break and the recovery rate is low

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  • Super-high seam coal face hydraulic fracturing coal mining method
  • Super-high seam coal face hydraulic fracturing coal mining method
  • Super-high seam coal face hydraulic fracturing coal mining method

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Embodiment 1

[0036] Embodiment 1: A kind of hydraulic fracturing coal mining method in coal mining face of extra-thick coal seam, please refer to Figure 1 to Figure 5 .

[0037] like figure 1 As shown, the hydraulic fracturing coal mining method of the ultra-thick coal seam coal mining face provided by the embodiment of the present invention includes the following steps:

[0038] S100. Arranging and drilling hydraulic fracturing holes: along the length direction of the coal mining face, drill a row of hydraulic fracturing holes in the upper coal body in the coal mining face. The hydraulic fracturing holes include shallow holes and deep holes arranged alternately. hole.

[0039] Combine below Figure 2 to Figure 5 The specific operation manner of step S100 is described.

[0040] figure 2 It shows a schematic diagram of the planar structure of a mining coal mine. Coal mining means that before coal mining, two roadways are opened from the ground to the depth of the coal mine. These two...

example

[0056] A coal mine being mined by an industrial coal mine works through comprehensive mechanization. The length of the coal mining face along the roadway (transportation chute, return air chute) is 1295m, the inclination angle of the coal mining face is 17°, and the length The coal seam has an average thickness of 130m, and the average thickness of the coal seam is 17m. The coal mining process is comprehensive mechanized top coal caving, the mining height is 3.0m, and the coal caving height is 14.03m. The relative gushing volume is 4t / m3. Here, the mining height of 3.0m refers to the height range that can be mined by the cutting head of the roadheader, and the coal setting height of 14.03m refers to the height range mined by breaking and caving the coal body at the top of the coal mining face.

[0057] At the beginning of coal mining, the coal mine used explosives to carry out advanced pre-splitting blasting of the top coal, but due to the thick coal seam and the long coal min...

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Abstract

The invention discloses a super-high seam coal face hydraulic fracturing coal mining method. The super-high seam coal face hydraulic fracturing coal mining method includes the following steps of drilling a row of hydraulic fracturing holes in a coal body above a coal face in the length direction of the coal face, wherein the hydraulic fracturing holes include shallow holes and deep holes in a staggered mode; installing a water injecting and hole sealing device at the bottom of each hydraulic fracturing hole, and performing high-pressure water injecting on each hydraulic fracturing hole so thatthe coal body above the coal face can be crushed and caved. The hydraulic fracturing holes in the super-high seam coal face hydraulic fracturing coal mining method are distributed in the high-low staggered mode, hydraulic fracturing can be carried out on different depth layers, top coal fracturing is sufficient, hydraulic fracturing blind areas are avoided, and the top coal caving lumpiness is reduced; construction is simple and convenient when holes are vertically formed in the coal face, the water injecting and hole sealing devices in the drilled holes are not prone to blockage, and recovery is easy under the effect of gravity.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing coal seams, in particular to a hydraulic fracturing coal mining method for coal mining working faces in extra-thick coal seams. Background technique [0002] At present, most of the dominant coal mining methods in my country's extra-thick coal seams are fully mechanized mining, that is, the coal body at the bottom adopts comprehensive mechanized mining, that is, coal digging, coal loading, coal transportation, and support are all mechanized. After mining, the coal body at the top collapses and is directly lowered and transported out. [0003] However, fully mechanized caving mining has high requirements on mine pressure. After the coal at the bottom is mined, if the mine pressure on the overlying strata on the coal mining face appears to ease, the mine pressure will not be able to achieve timely and sufficient crushing of the top coal. , resulting in the coal body above the coal minin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21C45/00
CPCE21C41/18E21C45/00
Inventor 郭重托赵文超苏新会王雪宁曹顺忠董强杜信贤丁吉祥孙建贞陈国彪赵卫会
Owner 伊犁永宁煤业化工有限公司
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