Study on Distribution Law of Stress and Permeability around Hydraulic Fracturing Borehole in Coal and Rock

Xiaomin Wu, Yuan Zhao, Yongjun Yu, Bo Zhang, Li Jia and Xidong Du
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Xiaomin Wu: School of Civil Affairs and Social Governance, Chongqing City Management College, Chongqing 401331, China
Yuan Zhao: Sinohydro Engineering Bureau 8 Co., Ltd., POWERCHINA, Changsha 410004, China
Yongjun Yu: Sinohydro Engineering Bureau 8 Co., Ltd., POWERCHINA, Changsha 410004, China
Bo Zhang: Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Melbourne 3800, Australia
Li Jia: School of Intelligent Engineering, Chongqing City Management College, Chongqing 401331, China
Xidong Du: Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China

Energies, 2022, vol. 15, issue 12, 1-11

Abstract: By constructing the permeability model to distinguish the fracture zone, plastic zone, and elastic zone around the hydraulic fracturing borehole, we study the influence of some important parameters on the stress distribution around the borehole and the permeability of the coal rock. The research results show that the greater the ground stress, the greater the radial stress in the fracture zone and plastic zone, and the smaller the radial stress in the elastic zone, while the trend of the stress variation in permeability is the opposite to the radial stress. The greater the gas pressure, the greater the permeability of the coal rock in each stress area. The larger the borehole radius, the smaller the radial stress at the same distance from the borehole center, and the greater the permeability of the coal rock. The greater the fracturing pressure, the greater the radial stress on the coal rock at the same distance from the borehole center, and the smaller the permeability of the coal rock. The research results can provide a theoretical reference for hydraulic fracturing construction in coal mines with different reservoir environments.

Keywords: hydraulic fracturing; gas extraction; stress distribution; permeability evolution; elastic strain softening; stress-permeability mode (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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