Numerical simulation research on diffusion law of seepage grouting in multi-branch horizontal well of coal seam floor

CHENG Wan; SUN Jiaying; ZHANG Yi; LI Hua and SHI Yaojun; ${author.authorNameEn}

doi:10.12143/j.ztgc.2023.05.019

2023 Vol. 50, No. 5

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Article navigation > DRILLING ENGINEERING > 2023 > 50(5): 133-139

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CHENG Wan, SUN Jiaying, ZHANG Yi, LI Hua and SHI Yaojun, . 2023. Numerical simulation research on diffusion law of seepage grouting in multi-branch horizontal well of coal seam floor. DRILLING ENGINEERING, 50(5): 133-139. doi: 10.12143/j.ztgc.2023.05.019

Citation:

CHENG Wan, SUN Jiaying, ZHANG Yi, LI Hua and SHI Yaojun, . 2023. Numerical simulation research on diffusion law of seepage grouting in multi-branch horizontal well of coal seam floor. DRILLING ENGINEERING, 50(5): 133-139. doi: 10.12143/j.ztgc.2023.05.019

Numerical simulation research on diffusion law of seepage grouting in multi-branch horizontal well of coal seam floor

1.China University of Geosciences, Wuhan Hubei 430074, China;
2.First Exploration Team of Anhui Provincial Bureau of Coal Geology, Huainan Anhui 232052, China;
3.Exploration Research Institute, Anhui Provincial Bureau of Coal Geology, Hefei Anhui 230094, China

Received Date: 29 January 2023

Revised Date: 13 June 2023

Abstract

Abstract

Grouting sealing technology in multi-branch horizontal wells has been widely used in the water hazard control of mining wells. However， the quantitative characterization method for diffusion range of grouting in the deep formation is lack of research， therefore references for space and buried depth of multi-branch horizontal wells are inadequate. Aiming at seepage grouting technology for multi-branch horizontal wells and considering the anisotropic permeability， two phase flow of cement grouting and porous water， a numerical diffusion model for seepage grouting and a theoretical model for simplified diffusion radius are built in this paper， and the numerical simulations on the seepage grouting are conducted combining with actual engineering cases. The results show that the seepage diffusion area in anisotropic formations tends to be ellipse. The major axis of ellipse is along the bedding plane which has a larger permeability， while the minor axis is perpendicular to the bedding plane. These researches provide some references for the design of space and buried depth of multi-branch horizontal wells and key parameters optimization for seepage grouting.
- seepage grouting /
- horizontal well /
- water hazard control in mining wells /
- anisotropy /
- multi-branch well

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References

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