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Fully mechanized caving face inter-frame oriented hydraulic fracturing top-coal weakening method

A technology for hydraulic fracturing and top coal, which is used in surface mining, earth-moving drilling, and fluid extraction. It can solve the problems of long water injection time, large water injection volume, gas explosion, etc., and achieve high recovery rate mining and high solution cost. , to improve the effect of spoofing

Inactive Publication Date: 2016-08-31
TIANDI SCI & TECH CO LTD
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Problems solved by technology

Among them, shallow hole blasting between the working face frames has a very obvious effect of weakening the top coal due to the directness of the weakening, but in view of its safety issues, this method has been banned by the state; the cost of deep hole blasting along the working face or in the process lane is high , poor controllability, a large amount of dust is likely to be generated during the blasting process, which deteriorates the environment of the working face, and it is easy to cause gas explosions in high-gas mines, and easy to cause roof fall accidents on the working face of the soft roof; the water injection time of the advanced water injection softening technology is longer, The water injection volume is large, and the effect is poor for coal bodies with small permeability coefficient and low porosity

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  • Fully mechanized caving face inter-frame oriented hydraulic fracturing top-coal weakening method
  • Fully mechanized caving face inter-frame oriented hydraulic fracturing top-coal weakening method

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Embodiment Construction

[0023] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0024] The average thickness of the coal seam in a mine is 13.7m, which is a medium-hard coal seam, and the coal seam dip angle is 1-3°. The fully mechanized top coal caving technology is used for mining. The coal cutting height is 3.2m, and the average coal caving height is 10.5m. Before directional hydraulic fracturing, The top-coal recovery rate of the working face is 40% to 50%. According to the detection and analysis of intelligent TV imaging technology, the integrity of the top-coal above 4.5m above the support of the working face is better. According to the actual situation on site, in order to weaken the complete top-coal area above 4.5m of the support, first use a pneumatic or hydraulic rock bolt drill to drill vertically between the fully-mechanized caving hydraulic supports (6) in the fully-mechanized caving face (11) hole (3), the drilling di...

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Abstract

The invention relates to a fully mechanized caving face top-coal weakening method, called a fully mechanized caving face inter-frame oriented hydraulic fracturing top-coal weakening method. The method comprises: among frames of a fully mechanized caving face, using a pneumatic or hydraulic roof bolt driller to fracture and drill holes on a complete top-coal region on the upper part of a support, using a special slotting drill bit to perform oriented slotting, using a hydraulic inflation type high-pressure hole packer to seal holes, a high-pressure pump injecting high-pressure water to perform oriented fracturing, so as to realize oriented weakening on a fixed point on the complete top-coal region on the upper part of the support.

Description

Technical field [0001] The invention relates to a method for weakening the top coal of a fully mechanized caving face, in particular to a method for weakening the top coal by directional hydraulic fracturing between frames of the fully mechanized caving face. Background technique [0002] Fully mechanized caving mining technology has become the preferred method for mining thick and extra-thick coal seams because of its large production capacity, high efficiency, and good benefits. Although fully mechanized caving mining technology has been widely used in It can be seen that the low recovery rate is still a common problem in the fully mechanized caving face, especially for the fully mechanized caving face with a large Platts hardness coefficient and strong toughness of the top coal. At present, the top-coal weakening technologies in fully mechanized caving mining mainly include: shallow hole blasting between the working face frames, deep hole blasting along the working face o...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21C41/18
CPCE21B43/26E21C41/18
Inventor 毛德兵王东攀黄志增张震张学亮孙晓冬薛吉胜
Owner TIANDI SCI & TECH CO LTD
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