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Drill hole arrangement structure and permeability-increasing method for coal seam high-pressure waterpower slotted fracturing

A technology for hydraulic slitting and drilling arrangement, which is used in safety devices, earth-moving drilling, drilling with liquid/gas jets, etc., can solve the problems such as the difficulty in controlling the expansion direction of fracturing cracks and the small influence range of slitting and drilling, etc. Achieve the effect of reducing outburst risk, shortening the time to reach the standard of extraction, and improving the efficiency of extraction

Active Publication Date: 2016-09-28
淮南宏昌科技有限责任公司
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AI Technical Summary

Problems solved by technology

[0004] In view of the above technical problems, the purpose of the present invention is to provide a drilling layout structure for high-pressure hydraulic slotted fracturing of coal seams to solve the problems of small impact range of slotted drilling and difficult control of the expansion direction of fracturing cracks, and realize efficient gas pumping. At the same time, the number of fracturing drilling holes is reduced, thereby reducing the cost. The invention also provides a method for increasing the permeability of coal seam high-pressure hydraulic slotting fracturing

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  • Drill hole arrangement structure and permeability-increasing method for coal seam high-pressure waterpower slotted fracturing
  • Drill hole arrangement structure and permeability-increasing method for coal seam high-pressure waterpower slotted fracturing
  • Drill hole arrangement structure and permeability-increasing method for coal seam high-pressure waterpower slotted fracturing

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Embodiment Construction

[0025] Such as figure 1 , figure 2 , image 3 and Figure 4 As shown, this embodiment is a drilling layout structure for high-pressure hydraulic slotted fracturing of coal seams. The construction site is selected from the low-level gas drainage roadway of the 12408 working face of a coal mine, and the bottom drainage roadway 3 is directed to the coal seam 4 along its length direction. There are three rows of drill holes in the direction, each row of drill holes includes a plurality of slotted drill holes 1 and a plurality of fracturing drill holes 2, the opening point of one row of drill holes is located on the roof of the roadway, 1m away from the side of the roadway; the other two rows The opening points of the drilled holes are all located on the side of the roadway, and the distance from the roadway floor 5 is 2m; two slotted drilled holes 1 are arranged at equal intervals between the adjacent two fracturing drilled holes 2 of each row of drilled holes, and the adjacent...

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Abstract

The invention provides a drill hole arrangement structure for coal seam high-pressure waterpower slotted fracturing. Three rows of drill holes are formed in a bed plate tunnel towards a coal seam in the length direction of the bed plate tunnel. Each row of drill holes comprises a plurality of slotting drill holes and a plurality of fracturing drill holes. Trepanning points of one row of drill holes are located on a tunnel roof, and trepanning points of the other two rows of drill holes are located on tunnel sides. Two slotting drill holes are arranged between every two adjacent fracturing drill holes in each row of drill holes in a spaced mode. According to the drill hole arrangement structure, by reasonably designing the arrangement mode and the quantity of the slotting drill holes and the fracturing drill holes, while the extraction efficiency is improved, the number of the fracturing drill holes is reduced, and cost is reduced. The invention further provides a permeability-increasing method for coal seam high-pressure waterpower slotted fracturing.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a drilling arrangement structure and an anti-permeability method for high-pressure hydraulic fracturing of coal seams. Background technique [0002] Most of the coal mines in my country are mines with high gas and low air permeability. Gas accidents account for the largest proportion of all kinds of serious and extraordinarily serious accidents in mines, and cause the most serious losses to mines. With the increasing social demand for coal and the continuous improvement of mining capacity, the trend of increasing mining depth is becoming more and more obvious. With the increase of coal seam mining depth, coal seam gas pressure increases, gas content increases, coal seam permeability decreases, the number of outburst coal seams also increases, and coal and gas outburst mines also increase. Therefore, it is necessary to conduct further research on the measures of e...

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Application Information

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IPC IPC(8): E21F7/00E21B43/26E21B7/18
CPCE21B7/18E21B43/261E21F7/00
Inventor 贺昌雨
Owner 淮南宏昌科技有限责任公司
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