X-shaped real fracture channels-based simulation of coal seam gas seepage

SU Zhengrui; WEI Shanyang

doi:10.3969/j.issn.1001-1986.2020.06.015

Volume 48 Issue 6

Dec. 2020

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COAL GEOLOGY & EXPLORATION > 2020 > 48(6): 109-115. > DOI: 10.3969/j.issn.1001-1986.2020.06.015

SU Zhengrui, WEI Shanyang. X-shaped real fracture channels-based simulation of coal seam gas seepage[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(6): 109-115. DOI: 10.3969/j.issn.1001-1986.2020.06.015

Citation:

SU Zhengrui, WEI Shanyang. X-shaped real fracture channels-based simulation of coal seam gas seepage[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(6): 109-115. DOI: 10.3969/j.issn.1001-1986.2020.06.015

Citation:

SU Zhengrui, WEI Shanyang. X-shaped real fracture channels-based simulation of coal seam gas seepage[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(6): 109-115. DOI: 10.3969/j.issn.1001-1986.2020.06.015

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X-shaped real fracture channels-based simulation of coal seam gas seepage

SU Zhengrui¹,
WEI Shanyang^1,2

1. Mining College, Guizhou University, Guiyang 550025, China;
2. Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources in Guizhou Province, Guizhou University, Guiyang 550025, China

Funds:

Science and Technology Program of Guizhou Province(Qiankehezhicheng[2019]2887)

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Received Date: July 12, 2020
Revised Date: October 21, 2020
Published Date: December 24, 2020

Graphical Abstract

Abstract

Abstract

In theudy of fracture structure, the image processing with conventional X-ray or CT scanning will be accompanied by a large number of secondary fractures, and the main fracture characteristics are not obvious, which can not directly reflect the relationship between fracture structure and fluid velocity. High definition camera is used to take X-shaped real cracks in coal wall for digital processing, and the characteristics of fractures are extracted by CAD software, and the images are vectorized into the model, the distribution nephogram of seepage velocity field and seepage pressure field is obtained by simulating software. The results show that from the entrance, the seepage pressure decreases from the left to the right, are evenly distributed in the fracture channels, the fracture area fully releases the pressure, which is a pressure buffer zone; the distribution of seepage velocity field in the rock mass is uneven, the seepage in the tributary area is more active than that in the confluence area, and the angle between the gas flow direction and the fracture direction has obvious influence on the seepage velocity. The maximum seepage velocity of gas in the same flow direction is 29.5 times. There is a logarithmic function relationship between the seepage velocity in the fracture channel and the fracture size. When the fracture size is 0.68-1.23 mm, the seepage velocity is most obvious. The research results could be used to understand the characteristic of gas seepage flow in coal fractures intuitively.
- X shape crack,
- gas seepage,
- numerical simulation,
- digital image recognition,
- slit channel

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References

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X-shaped real fracture channels-based simulation of coal seam gas seepage

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