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

A hard roof and working face technology, applied in ground mining, earth drilling, underground mining, etc., can solve the problems of large pyrotechnics, high drilling costs, and inability to solve the problem of outburst elimination in the working face

Inactive Publication Date: 2018-11-06
王一帆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment 1

[0107] According to an embodiment of the method for eliminating the ground outburst in advance of the whole working face of the coal mine hard roof of the present invention, it comprises the following steps in sequence:

[0108] Step 1: Design drilling parameters and fracturing parameters according to the data and data collected in the previous field construction;

[0109] Step 2: Arrange a directional drilling rig on the ground corresponding to a certain working face of the coal mine, and use the directional drilling rig to drill a horizontal well to the preset position on the hard roof, and complete the horizontal section of the horizontal well with open holes;

[0110] Step 3: Arrange the equipment required for staged fracturing of horizontal wells at the drilling site;

[0111] Step 4: Carry out staged fracturing construction on the open-hole horizontal section of the horizontal well, so that the hard roof of the entire working face is covered with cracks, so as to achieve...

Embodiment 2

[0171] According to another embodiment of the ground outburst elimination method of the coal mine hard roof full working face in advance of the present invention, its process steps, design formulas, principles of drilling and construction parameters, construction equipment used, beneficial effects, etc. are all the same as those of the first embodiment ,the difference is:

[0172] The staged fracturing method for the horizontal section of the open hole is double-sealed and single-chassis staged fracturing. Split segment. Fracturing string: tubing + safety joint + centralizer + hydraulic packer + pressure opening sleeve + hydraulic packer + centralizer + guide shoe, fracturing the deepest part of the horizontal section first, and dragging after the first stage of fracturing Move the tubing string until the pressure-opening sliding sleeve is aligned with the second fracturing stage, fracturing the second stage, and complete the N-stage fracturing in this cycle.

[0173] The me...

Embodiment 3

[0183] According to another embodiment of the ground outburst elimination method of the coal mine hard roof full working face in advance of the present invention, its process steps, design formulas, principles of drilling and construction parameters, construction equipment used, beneficial effects, etc. are all the same as those of the first embodiment ,the difference is:

[0184] The staged fracturing method of the horizontal section of the open hole is a ball-sliding sleeve staged fracturing method. The main features of this fracturing method are "ball-sliding sleeves" and "immobile strings", that is, completion strings and fracturing strings are used. The split pipe strings are combined into one string and run together, and tools such as hanging packers, expandable open-hole packers, ball-pitching sleeves, differential pressure sleeves, and setting ball seats are used to run into the well. Fracturing string: hanging packer + open hole packer N + ball sliding sleeve N + divi...

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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...

Claims

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Application Information

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IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 王一帆马俯波王衍
Owner 王一帆
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