Slotting induced-flow pressure-relief anti-reflection method for complicated seam

A technology of coal seam and induced blowout, which is used in earth-moving drilling, wellbore/well components, mining equipment, etc., can solve the problems of low drilling utilization efficiency, difficult desorption of coal gas, and low gas drainage efficiency. Improve the field application value and social benefits, increase the effective scope of influence, and shorten the coal seam outburst elimination time

Active Publication Date: 2013-03-13
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

[0003] Technical problems: complex coal seams have problems such as poor coal seam permeability, difficult coal gas desorption, and serious coal and gas outbursts. In regional gas control, there are problems such as low gas drainage efficiency, large drilling volume and low drilling utilization efficiency.

Method used

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  • Slotting induced-flow pressure-relief anti-reflection method for complicated seam
  • Slotting induced-flow pressure-relief anti-reflection method for complicated seam
  • Slotting induced-flow pressure-relief anti-reflection method for complicated seam

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Embodiment 1

[0019] Embodiment 1. The complex coal seam slotting method of the present invention to induce spouting, pressure relief and anti-permeability enhancement:

[0020] a. If Figure 4 As shown, firstly, according to the layout of the coal seam bottom drainage roadway and the parameters of the measures to protect the coal seam, the drilling parameters of the through-bed drainage are designed. The distance between the drilling holes 2 entering the coal seam is 4-8m;

[0021] b. Send the high-pressure water jet into the bed-crossing drainage borehole 2 through the sealed drill pipe to the top plate of the coal seam 3, and start from the coal seam roof of the bed-crossing drainage borehole 2 to perform fixed-point rotary hydraulic slotting through high-pressure water jet rotation, Inducing the unsteady ejection of the coal body, the water pressure of the high-pressure water jet pipeline can be adjusted between 5 and 15 MPa at this time; when the gas gushes violently in the drill hol...

Embodiment 2

[0025] Embodiment two, such as Figure 5 As shown, the method of interlayer drilling and interval slotting to induce jetting to relieve pressure and increase permeability is basically the same as Example 1, except for some similarities. The layout of interlayer-crossing drainage drilling 2 selects the drilling holes for slotting and spraying operations, and selects the number and parameters of slotting and spraying-through-bed drainage drilling 2 according to the actual situation and needs of the site. The distance between the coal seam of drilling hole 2 is 4~6m, and the high-pressure water jet fixed-point cutting and erosion, the amount of coal slag removed and the distance between adjacent cutting positions can be adjusted according to the actual situation of coal seam and gas occurrence.

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Abstract

A slotting induced-flow pressure-relief anti-reflection method for a complicated seam is suitable for gas control of high-gas high-ground-stress complicated seam regions, can improve the gas permeability and gas desorption rate of coal, solves the difficult problems of low exhausting and mining efficiencies of coal-bed gas, high drilling construction load and the like, and realizes efficient gas exhausting and mining as well as fast outburst elimination of the complicated seam. High-pressure water is jetted into drilled holes to cut and destroy the coal in a rotary manner, and the coal in the radial direction of the drilled holes is destroyed and disturbed, so that buckling failures of the coal are induced and the coal and the gas are enabled to be spouted out of the drilled holes, as a result, the gas expansion energy of the coal is released, coal cracks are expanded and the exposure surface area of the coal is increased. therefore, the gas exhausting and mining efficiencies of coal are improved, coal and gas burst risks are eliminated, the effective influence range of drilling gas exhausting and mining is improved by 1-3 times, the air permeability coefficient of coal around the drilled holes is improved by 100-200 times, the drilling methane gas exhausting and mining quantity is improved by 2-5 times within hundreds of meters, and the outburst elimination time of the coal bed is shortened by 30-50 percent. The slotting induced-flow pressure-relief anti-reflection method for the complicated seam has very good field application value and social benefits.

Description

technical field [0001] The invention relates to a method for inducing spouting, pressure relief, and permeability enhancement by slits in complex coal seams, which is suitable for regional gas control in complex coal seams with high gas and high ground stress. Background technique [0002] The fundamental means of gas control in mines in my country is gas drainage measures based on drilling gas drainage methods. As my country's coal mines enter deep coal seam mining, problems such as poor air permeability of coal seams, difficult gas drainage, and prominent dynamic phenomena are becoming more and more serious. Hydraulic measures are an effective measure to improve the efficiency of coal seam gas drainage and have been widely used in the field; injection holes in boreholes are the appearance of coal mass instability and gas energy release around the borehole, which will cause energy release inside the coal mass and the expansion of coal fissures have a significant effect on red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26
Inventor 林柏泉沈春明张其智段永生
Owner CHINA UNIV OF MINING & TECH
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