Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction

A technology of hydraulic fracturing and gas drainage, which is applied in the direction of gas discharge, mining fluid, mining equipment, etc., and can solve the problem of unscientific layout and drilling depth of hydraulic fracturing holes and gas drainage holes, gas drainage and outburst elimination The effect cannot be guaranteed, and the gas drainage process cannot be organically combined, etc.

Inactive Publication Date: 2012-03-21
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, coal seam water injection has achieved a certain degree of effect in preventing coal and gas outburst accidents, but this technology still has a certain degree of blindness, lacks the necessary theoretical support, and the layout of hydrauli

Method used

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  • Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction
  • Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction
  • Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment one: if figure 1 As shown, the coal and gas outburst coal seam in the mining face of a certain mine has an average thickness of 4m, a hardness of f=2, and the length of the coal mining face 3 is 206m. Set the gas drainage pump 2 on the ground, and the water injection pump 1 in the air lane 5 of the coal mining face 3; figure 1 The hole positions of hydraulic fracturing holes S and gas drainage holes K are arranged as shown, and the hole positions of hydraulic fracturing holes S and gas drainage holes K can also be set only in one roadway of machine lane 4 or wind lane 5 . Hydraulic fracturing holes S and gas drainage holes K are alternately constructed in the direction of the coal seam according to the set hole position one by one, and the hydraulic fracturing holes S and gas drainage holes are constructed alternately in the direction of the coal seam in the machine lane 4 and wind lane 5 of the coal mining face Holes K are arranged in parallel, and the spac...

Embodiment 2

[0019] Embodiment two: if figure 2 As shown, the coal and gas outburst coal seam in the mining face of a certain mine has an average thickness of 2m, a hardness of f=2, and a working face length of 140m. Set the gas drainage pump 2 on the ground, and the water injection pump 1 in the airway 5 of the coal mining face 3; in the airway 5 of the coal mining face, as figure 2 As shown, multiple drilling sites are set up with a distance of 20-100m. Each drilling site is arranged with 1-3 rows of drilling holes. The number of hydraulic fracturing holes S is 1-8, and the number of gas drainage holes K is 1-20. The hydraulic fracturing holes S and the gas drainage holes K that are alternately constructed in each drilling site towards the coal seam are fan-shaped. For example, the interval between the drilling sites is 30m. There are 1 fan-shaped hydraulic fracturing hole S and 4 gas drainage holes K. The hydraulic fracturing hole S is 120m long, and the gas drainage hole K is 95m lo...

Embodiment 3

[0020] Embodiment three: as image 3 As shown, the coal and gas outburst coal seam in the tunnel of a certain mine has an average thickness of 3m and a hardness of f=2.5. Set the gas drainage pump on the ground, and the water injection pump in the adjacent roadway of the excavation face 7; set the hydraulic fracturing hole S and the gas drainage hole K in the excavation face 7 in a quincunx shape, and press the design one by one. Alternately construct hydraulic fracturing holes S and gas drainage holes K in the direction of the coal seam at the fixed hole positions, and there are 1 to 4 rows of mechanical fracturing holes S and gas drainage holes K, of which there are 1 to 8 hydraulic fracturing holes S and gas drainage holes There are 1-20 production holes K, and the drilling direction is fan-shaped. The drilling depth of the hydraulic fracturing hole S is 3-80m longer than that of the gas drainage hole K. like image 3 As shown, for example, fan-shaped hydraulic fracturing...

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Abstract

The invention discloses a refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction. The method comprises the following steps of: gradually and alternately constructing hydraulic fracture holes and gas extraction holes in the coal bed direction in a coal mining working face tunnel, an airway or a tunneling working face, and performing high-pressure water injection and gas extraction; stopping injecting water after the water is injected into the hydraulic fracture holes for 0.5 to 5 hours, and changing gas extraction pipe joints to extract gas; after the hydraulic fracture hole or gas extraction concentration is lower than 5%, changing water injection pipes to perform static pressure water injection; and when the coal mining working face is recovered to the position 5 meters away from the static pressure water injection holes or the tunneled working face is tunneled again, stopping a pump or closing a static pressure water valve to stop water injection. According to the method, refection reduction of the gas-containing coal bed is realized, the gas extraction rate is improved, the gas in the mining space is effectively prevented from exceeding the limit, outburst risks of coal and gas are reduced, and safe and efficient recovery of coal is ensured. The method is simple and good in effect.

Description

technical field [0001] The invention relates to a method for gas drainage and outburst elimination, in particular to a method for increasing permeability and eliminating outburst in shallow hole drainage by hydraulic fracturing in deep holes. Background technique [0002] Coal and gas outburst is one of the major accidents that seriously threaten the safe and efficient production of coal mines. Pre-pumping coal seam gas is a fundamental measure to prevent gas disasters. The gas content and pressure of the coal seam can be reduced by pre-pumping, thereby reducing or eliminating the hidden danger of coal and gas outburst during the mining of the outburst coal seam, and reducing the amount of gas gushing out of the mine during mining. A large number of experimental and theoretical research results show that with the increase of coal seam mining depth, the in-situ stress increases continuously, and the gas permeability coefficient of the coal seam decreases accordingly, which re...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/26
Inventor 黄炳香魏民涛程庆迎谢文强刘江伟房伟管辉
Owner CHINA UNIV OF MINING & TECH
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