Roof cracking method and device for coal mining

A technology for cracking and roofing, applied in the field of roof cracking methods and devices, can solve the problems of the old roof failing to collapse in an orderly manner, the existence of mining process, potential safety hazards, etc., and achieve a significant decrease in the mine pressure, reduce the mine pressure, and increase the production capacity. Effect

Active Publication Date: 2019-03-29
XIAN TONGYUAN PETROTECH
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AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems in the existing coal mining that the old roof cannot collapse in an orderly manner, resulting in high mine pressure and potential safety hazards in the mining process, the present invention provides a roof cracking method and device for coal mining

Method used

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  • Roof cracking method and device for coal mining
  • Roof cracking method and device for coal mining
  • Roof cracking method and device for coal mining

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0066] Reference figure 1 :

[0067] A roof cracking method used in coal mining includes the following steps:

[0068] 1) Select the location of the horizontal well head:

[0069] On the ground, according to the lateral position of the working face and the direction of working face extension, determine the position of the wellhead through the comparison chart of downhole and ground position. At the same time, the layout of the site should be considered. The general construction site area is 2500m 2 ~4000m 2 . After the rig is erected, the GPS measurement system is used for fixed measurement, and a retest is performed before the completion of the drilling.

[0070] 2) Drilling horizontal wells:

[0071] The horizontal well in this example is an "L" type horizontal, which is characterized by short vertical well sections and long horizontal sections. Generally, horizont...

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Abstract

The invention relates to the technical field of coal mining, in particular to a roof cracking method and device for coal mining. The cracking method and device for coal mining aim to solve the problemthat an existing coal mining process has high ore pressure and potential safety hazard as an old roof cannot collapse in order. The technical solution is that the roof cracking method for coal miningis characterized by comprising the following steps of (1) selecting a position of a horizontal well wellhead; (2) drilling a horizontal well; (3) cementing the well; (4) carrying pressure test; (5) carrying mud plugging; (6) performing subsection roof cracking; (7) carrying crack fracturing; and (8) sealing the well with a blind plug. At the same time, the invention provides the roof cracking device for coal mining with adaption of the cracking method.

Description

Technical field [0001] The invention relates to the technical field of coal mining, in particular to a roof cracking method and device used for coal mining. Background technique [0002] The coal roof is generally divided into a basic roof and an old roof, and the old roof is located above the basic roof. With the continuous advancement of the working face, the roof left in the goaf loses support. The stress cracks in the roof gradually expand under the influence of rock pressure, which will cause a large area of ​​caving, and the strong impact generated by the caving is extremely strong. It is easy to cause casualties of underground personnel and equipment damage. At the same time, it is also very likely to destroy the coal mining face in the vicinity and affect production. In order to ensure production safety, deep-hole blasting is generally used to drill multiple sets of holes from the underground to the basic roof working surface to crack the basic roof and collapse in an or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04F42D1/00
CPCF42D1/00F42D3/04
Inventor 张国桉于斌姚志中牛福龙孙宪宏张艳群张宏喜
Owner XIAN TONGYUAN PETROTECH
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