Wangeviry stope face roof hydraulic fracturing weakening method and device

A mining face and hydraulic fracturing technology, which is applied in surface mining, earthwork drilling, underground mining, etc., can solve problems such as low safety, threat to worker safety, and underground air pollution, and achieve the effect of improving safety

Inactive Publication Date: 2017-09-12
TIANDI SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blasting method uses a large amount of pyrotechnics, which has low safety. The toxic gas such as CO produced by the blasting pollutes the underground air and threatens the safety of workers.

Method used

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  • Wangeviry stope face roof hydraulic fracturing weakening method and device
  • Wangeviry stope face roof hydraulic fracturing weakening method and device
  • Wangeviry stope face roof hydraulic fracturing weakening method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0035] combine Figure 1 to Figure 3 As shown, in the method for weakening the roof hydraulic fracturing of the Wangerville working face provided by the embodiment of the present invention, the two ends of the mining working face are respectively provided with a joint roadway 3 and / or a transport roadway 8, and a coal pillar 5 is arranged Between two adjacent lanes 3 or between the transport lane 8 and the lane 3 adjacent to the transport lane 8, section branches are arranged between adjacent coal pillars 5. Lane 6 is also provided with transport flat lane 7 (as in the left side of transport flat lane 8 figure 1 shown), the method includes the following steps:

[0036] S1: Determine the structural parameters of the roof rock layer 9 and the coal pillar 5 of the mining face. Specifically, the structural parameters of the roof strata 9 are determined according to the columnar diagram of the borehole in the Wangerville mining face or peeped through the borehole. Among them, th...

Embodiment 2

[0050] The present invention also provides a hydraulic fracturing weakening device for the roof of Wangerville mining face, the device includes:

[0051] The parameter acquisition unit is used to determine the structural parameters of the roof rock layer 9 and the coal pillar 5 of the mining face;

[0052] The calculation unit is used to calculate the basic parameters of hydraulic fracturing drilling according to the structural parameters of the roof rock layer 9 and the coal pillar 5;

[0053] The drilling unit is used to drill a hydraulic fracturing hole obliquely to the roof rock layer 9 above the coal pillar 5 from the transport roadway or joint roadway according to the calculation result of the calculation unit;

[0054] The hydraulic fracturing weakening treatment unit is used for performing hydraulic fracturing weakening treatment at a preset position on a hydraulic fracturing borehole.

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PUM

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Abstract

The invention relates to the field of coal mining, and discloses a Wangeviry stope face roof hydraulic fracturing weakening method. The method comprises the following steps of S1, determining the structure parameters of a roof rock layer and a coal pillar of a stope face; S2, calculating the basic parameter of a hydraulic fracturing drill hole according to the structure parameters of the roof rock layer and the coal pillar; S3, according to the calculation result, drilling a horizontal fracturing drill hole in an inclined direction on the roof rock layer above the coal pillar from a connected roadway or a haulage drift or a section branch roadway; S4, performing hydraulic fracturing weakening treatment in the preset position on the hydraulic fracturing drill hole. The method provided by the invention has the advantages that the in-time safe caving of the roof rock layer in the stope process can be ensured; vicious accidents such as work face equipment damage and casualties due to hurricane and strong impact generated by one-step caving caused by the large-area suspended roof in a goaf can be avoided. The invention also discloses a Wangeviry stope face roof hydraulic fracturing weakening device.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method and device for hydraulic fracturing and weakening of roof strata in Wangerville mining face. Background technique [0002] my country has an internationally advanced longwall comprehensive mechanized coal mining method. However, there are still a large number of corner coal blocks that are not suitable for the layout of longwall working faces in my country. For example, the corner coal block sections of large well fields and the block sections that are not suitable for the layout of fully mechanized mining working faces, the working faces are mostly irregular blocks, and the longwall comprehensive mechanized coal mining method cannot be used for recovery. According to statistics, the recoverable reserves of the irregular corner coal blocks and some small wells in the Shenfu Dongsheng mining area alone are 532.19 million tons, accounting for 17.24% of the total recov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 冯彦军吕华文张晓石垚苏波王志超胡滨王洋
Owner TIANDI SCI & TECH CO LTD
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