Method and equipment for controlling top coal cavability with pulse hydraulic fracturing

A technology of hydraulic fracturing and cavitation, which is applied in the field of pulse hydraulic fracturing to control cavitation and cavitation of top coal. The coal effect is not obvious and other problems, to achieve the effect of wide practicability, convenient construction, simple method

Active Publication Date: 2018-10-19
CHINA UNIV OF MINING & TECH +1
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  • Abstract
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Problems solved by technology

[0004] The deep hole pre-blasting technology, blasting and water injection combined pre-comprehensive weakening technology all involve the management and transportation of explosives and detonators, and the "one shot, three inspection system" and "three-person chain firing system" must be strictly implemented for blasting, and the safety management is complicated; A large amount of harmful gases such as CO produced instantly by large-scale blasting have a huge impact on mine ventilation safety management; for high-gas mines, blasting broken coal pillars should not be used due to the hidden danger of gas explosion induced by blasting sparks; fully mechanized mining faces are generally about 200m , deep-hole blasting is carried out in the upper and lower all

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  • Method and equipment for controlling top coal cavability with pulse hydraulic fracturing
  • Method and equipment for controlling top coal cavability with pulse hydraulic fracturing
  • Method and equipment for controlling top coal cavability with pulse hydraulic fracturing

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Embodiment 1

[0055] Such as figure 1 , Figure 3 to Figure 6 As shown, the average thickness of the coal seam of a certain mine is 7.5m, the direct roof is gravelly coarse sandstone, sometimes mudstone, sandy mudstone, with an average thickness of 6.32m; the old roof is coarse sandstone with an average thickness of 4.06m, and the direct bottom is siltstone, with an average The thickness is 2.10m. Open cut in working face: the rectangular roadway is supported by bolts, nets and cables, with a net width of 8.5m, a net height of 3.2m, and a net section area of ​​27.2m 2 . Transportation along the working face: The rectangular roadway is supported by the combination of anchors, nets and cables, with a net width of 4.6m, a net height of 3.2m, and a net section area of ​​14.72m 2 . Working face return wind tunnel: The support method is the same as the transportation tunnel, rectangular roadway, clear width 4.6m, clear height 3.2m, net section area 14.72m 2 .

[0056] Such as image 3 with Figure...

Embodiment 2

[0077] Such as figure 2 , Figure 3 to Figure 6 As shown, the average thickness of a coal seam in a certain mine is 9m. The direct roof is gravelly coarse sandstone, sometimes mudstone or sandy mudstone, with an average thickness of 7m; the old roof is coarse sandstone with an average thickness of 4m, and the direct bottom is siltstone with an average thickness of 2m. Open cut in working face: the rectangular roadway is supported by bolts, nets and cables, with a net width of 9m, a net height of 3m, and a net section area of ​​27m 2 . Transportation along the working face: The rectangular roadway is supported by the combination of anchors, nets and cables, with a net width of 4.6m, a net height of 3.2m, and a net section area of ​​14.72m 2 . Working face return wind tunnel: The support method is the same as the transportation tunnel, rectangular roadway, clear width 4.6m, clear height 3.2m, net section area 14.72m 2 .

[0078] Such as image 3 with Figure 4 As shown, a long b...

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Abstract

The invention discloses a method and equipment for controlling top coal cavability with pulse hydraulic fracturing. According to the method, advantages of methods of pulse fracturing and common hydraulic fracturing are combined, a crack network is generated in coal through pulse hydraulic fracturing firstly, secondly, the crack network is further expanded through common large-displacement hydraulic fracturing, then a coal structure can be sufficiently transformed, the top coal breakage degree can be reduced, and the top coal cavability can be improved. The equipment disclosed by the inventioncomprises a small-displacement pulse pump and a large-displacement common pump which are controlled through a three-way valve and a switch valve, in construction, one path of the pulse pump is firstlycommunicated, a common high-pressure pump pipeline is closed, a pulse channel is closed after pulse fracturing is completed, and a common fracturing channel is opened. By adopting the method and theequipment, sufficient cracks can be generated in top coal, an effect of weakening the top coal can be achieved, the top coal cavability can be improved, the top coal cavability breakage degree can bereduced, convenience in construction is achieved, safety and reliability are achieved, and resource waste can be reduced.

Description

Technical field [0001] The invention relates to a method for controlling the caving of top coal, in particular to a method and equipment for controlling the caving of top coal by pulse hydraulic fracturing, and belongs to the technical field of coal mining. Background technique [0002] The reserves and output of thick and extra-thick coal seams in my country account for more than 40% of the total coal reserves and total output. Fully-mechanized top coal caving is a high-yield and efficient coal mining method for thick coal seams that has developed rapidly in my country. At present, fully-mechanized caving Mining has become the dominant coal mining method for thick and extra-thick coal seams in my country. The basic requirement of fully mechanized caving mining is "complete before the support, broken after the support". Due to the limitation of its technical characteristics, the mine pressure on the overlying rock layer on the hard and thick coal seam or the caving coal face appea...

Claims

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Application Information

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IPC IPC(8): E21C45/04E21C41/18
CPCE21C41/18E21C45/04
Inventor 黄炳香赵兴龙陈树亮邵鲁英
Owner CHINA UNIV OF MINING & TECH
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