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<p>Hydrodynamic cavitation is a promising technique for near-wellbore permeability enhancement. This study experimentally investigates the effects of organ-pipe geometrical configuration parameters, jet hydraulic power, pressure drop, discharge rate, standoff distance, and treatment duration on permeability enhancement in sandstone cores. The results show that increasing the jet hydraulic power and decreasing the hydraulic transmission efficiency, while keeping the geometrical configuration parameters within optimal value ranges, leads to high-intensity stimulation and maximizes permeability enhancement within a short treatment duration. Under a jet hydraulic power of 23.7 kW, a discharge rate of 72.9 L/min, and a pressure drop of 32 MPa, Nozzle 1 achieved maximum, average and minimum permeability enhancement rates of 102.5%, 37.2% and 22.8% respectively within the standoff distance of 0.8 m after a 30-minute treatment, demonstrating the effectiveness of hydrodynamic cavitation for near-wellbore permeability stimulation. However, the rapid permeability enhancement in rock cores near the cavitation tends to inhibit further enhancement at larger standoff distances. To achieve more uniform and sustained permeability enhancement across a broader region during long-duration treatment, it may be necessary to moderate the stimulation intensity.</p>

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Experimental Investigation of Near-Wellbore Permeability Enhancement by Hydrodynamic Cavitation Stimulation

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • Guichun Chen,
  • Deyong Zou,
  • Weidong Zhou,
  • Luopeng Li,
  • Yutong Wang,
  • Lichao Gao

摘要

Hydrodynamic cavitation is a promising technique for near-wellbore permeability enhancement. This study experimentally investigates the effects of organ-pipe geometrical configuration parameters, jet hydraulic power, pressure drop, discharge rate, standoff distance, and treatment duration on permeability enhancement in sandstone cores. The results show that increasing the jet hydraulic power and decreasing the hydraulic transmission efficiency, while keeping the geometrical configuration parameters within optimal value ranges, leads to high-intensity stimulation and maximizes permeability enhancement within a short treatment duration. Under a jet hydraulic power of 23.7 kW, a discharge rate of 72.9 L/min, and a pressure drop of 32 MPa, Nozzle 1 achieved maximum, average and minimum permeability enhancement rates of 102.5%, 37.2% and 22.8% respectively within the standoff distance of 0.8 m after a 30-minute treatment, demonstrating the effectiveness of hydrodynamic cavitation for near-wellbore permeability stimulation. However, the rapid permeability enhancement in rock cores near the cavitation tends to inhibit further enhancement at larger standoff distances. To achieve more uniform and sustained permeability enhancement across a broader region during long-duration treatment, it may be necessary to moderate the stimulation intensity.