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Shear Behavior of Two-Dimensional Propped Rough Fractures

Qi Zhang, Jin Luo (jinluo@cug.edu.cn), Sai Wang, Jinsong Zhu and Deshan Cui
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Qi Zhang: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Jin Luo: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Sai Wang: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Jinsong Zhu: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Deshan Cui: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Energies, 2024, vol. 17, issue 4, 1-15

Abstract: The deployment of proppant to fracture shear is a promising approach to stimulating hydraulic permeability in fractured reservoirs. However, the interactive effects of proppant and surface roughness have not been clearly revealed. To better understand this concern, direct shear tests (DSTs) are implemented on 2D rough fractures with a joint roughness coefficient (JRC) varying from 4 to 6 and 18 to 20 under propped conditions. The results show that peak shear strength is positively proportional to asperity amplitude. The highest peak shear strength is determined with a JRC of 14–16 due to it having the highest asperity of 6.34 mm. The peak shear load was decreased significantly by deploying the proppant. Shear damage only occurs in the localized zone where the upper–lower asperities contact. The shear dilatancy was attributed to both the “shear climbing” effects and the shear damage that caused the frictional slip. The proppants weaken the climbing effect but also prevent the shear damage that in turn promotes shear dilatancy.

Keywords: mechanical behavior; shear dilatancy; propped rough fractures; asperity amplitude; dilation angle (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: 2024
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