A method of slotting in complex coal seams to induce spouting, pressure relief and permeability enhancement
A technology of coal seam and induced blowing, which is applied in earth-moving drilling, gas discharge, mining fluid and other directions, can solve the problems of low drilling efficiency, low gas extraction efficiency, and difficult gas desorption from coal body, and achieves good on-site application. Value and social benefits, the effect of shortening coal seam outburst elimination time and increasing the effective scope of influence
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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 hole...
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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