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Shear Behavior of Two-Dimensional Propped Rough Fractures

Author

Listed:
  • 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)

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.

Suggested Citation

  • Qi Zhang & Jin Luo & Sai Wang & Jinsong Zhu & Deshan Cui, 2024. "Shear Behavior of Two-Dimensional Propped Rough Fractures," Energies, MDPI, vol. 17(4), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:4:p:956-:d:1341239
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    References listed on IDEAS

    as
    1. Guansheng Han & Yu Zhou & Richeng Liu & Qiongqiong Tang & Xingkai Wang & Leibo Song, 2022. "Influence of surface roughness on shear behaviors of rock joints under constant normal load and stiffness boundary conditions," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 112(1), pages 367-385, May.
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