Volume 52 Issue 4
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LIU Shanyong, YIN Biao, LOU Yishan, et al. Numerical simulation of migration and placement law of proppants in rough fractures [J]. Petroleum Drilling Techniques, 2024, 52(4)：104-109. DOI: 10.11911/syztjs.2024057
Citation: LIU Shanyong, YIN Biao, LOU Yishan, et al. Numerical simulation of migration and placement law of proppants in rough fractures [J]. Petroleum Drilling Techniques, 2024, 52(4)：104-109. DOI: 10.11911/syztjs.2024057
shu

Numerical Simulation of Migration and Placement Law of Proppants in Rough Fractures

  • 1.

    Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas, Yangtze University, Wuhan, Hubei, 430100, China

  • 2.

    National Engineering Research Center for Oil & Gas Drilling and Completion Technology, Yangtze University, Wuhan, Hubei, 430100, China

  • 3.

    Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou, Hubei, 434023, China

  • 4.

    School of Petroleum Engineering, Yangtze University, Wuhan, Hubei, 430100, China

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  • Received Date: December 04, 2023
  • Revised Date: April 30, 2024
  • Accepted Date: July 16, 2024
  • Available Online: July 18, 2024
    Graphical Abstract
    • Abstract

  • The rough and narrow fracture walls reduce the effective fracture volume of hydraulic fracturing, which greatly affects the migration and placement of proppants in the fractures and the effect of fracturing stimulation. Therefore, the self-correlated Gaussian distribution surface was established by Matlab, and the rough fracture surface was identified and analyzed with fractal theory. The bidirectional coupling of the computational fluid dynamics-discrete element method (CFD-DEM) was employed to build three-dimensional models of fractures with different roughness, and the deposition and migration process and law of different combinations of proppant diameters within the rough fracture channels were investigated. The research findings indicate that as the fractured surface transitions from smooth to rough, proppant plugging becomes more evident. Under the influence of gravity, small-sized proppants (ratio of diameter to fracture width of 0.3) exhibit better migration capabilities but struggled to ensure the near-wellbore supporting effect. The area covered by large-sized proppants (ratio of diameter to fracture width of 0.8) increase by 158.1%, but the proppant is blocked near the fracture end, affecting subsequent proppant migration to distant areas. Therefore, the recommended ratio of diameter to fracture width is 0.4. For the sand addition method with combined particle diameters, it is recommended to inject small-sized sand first and then large-sized sand to ensure the proppant migration distance and efficiency. The research outcomes contribute to a better understanding of the influence of fracture roughness on proppant migration within fractures, providing important guidance for optimizing fracturing design and operation parameters.

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