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LIU Xilong, SUN Qian, ZHANG Guobiao, et al.Flow characteristics of dual-increasing stimulation slurry in unconsolidated silty sandstone[J]. Drilling Fluid & Completion Fluid，2025, 42（0）：1-12
Citation: LIU Xilong, SUN Qian, ZHANG Guobiao, et al.Flow characteristics of dual-increasing stimulation slurry in unconsolidated silty sandstone[J]. Drilling Fluid & Completion Fluid，2025, 42（0）：1-12
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Flow Characteristics of Dual-Increasing Stimulation Slurry in Unconsolidated Silty Sandstone

  • 1.

    School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083

  • 2.

    State Key Laboratory of Deep Earth Exploration and Imaging, Beijing 100083

  • 3.

    School of Engineering Technology, China University of Geosciences (Beijing), Beijing 100083

  • 4.

    Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, China Geological Survey Guangzhou, Guangdong 511458

  • 5.

    National Engineering Research Center for Gas Hydrate Exploration and Development Guangzhou, Guangdong 511458

  • Received Date: 2025-06-25
  • Accepted Date: 2025-06-10
  • Rev Recd Date: 2025-07-21
    • Available Online: 2025-08-05
    Abstract
  • The dual-increasing stimulation slurry is a novel stimulation fluid developed for weakly cemented reservoirs, such as submarine methane-hydrate-bearing silty sandstones. After injection into the formation, it consolidates to form porous-media slurry veins that enhance permeability. This study employed a slurry fracture flow visualization apparatus to investigate the flow characteristics of the slurry within muddy silty sediments. The experiments revealed the influence of geological parameters, slurry formulation, and operational parameters on slurry flow, fluid loss, and slurry-vein porosity. The results indicate that the slurry flows uniformly and exhibits a convex fracture flow profile, flowing to the end of main fracture and branch fracture, effectively filling fractures. Lower fluid loss increases the proportion of medium-to-large pores within the slurry veins. Adjusting the slurry formulation can reduce fluid loss in formations of varying permeability, whereas a high injection rate expands the fluid loss zone. The effective porosity ranges from 50% to 60% with a uniformly distributed pore space, forming a structure dominated by large pores (pore diameter > 50 nm) and densely distributed micro- to mesopores (pore diameter < 50 nm). This pore network can serve as high-conductivity channels for gas and water migration, while the dense distribution of small and medium pores is conducive to sand control.

     

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