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<p>This study used laboratory core experiments, combined with flow characteristics, oil displacement effect, oil-water interface effect and other aspects to systematically explore the effect of high-displacement water injection on oil field recovery under proppant-free conditions. The experimental results show that with the increase of water injection rate, the flow velocity and pressure gradient increase significantly. When the water injection rate increases from 5 L/min to 12 L/min, the flow velocity increases by 82% and the pressure gradient increases by 112%. In terms of oil-water interface optimization, after the water injection rate increases, the oil-water interface instability index increases from 0.45 to 0.79, and the emulsification degree increases to 25.3%, indicating that the shear force enhancement is conducive to improving oil displacement efficiency. High-displacement water injection also effectively promotes the utilization of residual oil. When the water injection rate is 12 L/min, the residual oil saturation in the core decreases by 15.3%. High-displacement proppant-free water injection can significantly improve the recovery of low permeability reservoirs, mainly by enhancing hydraulic drive, optimizing oil-water interface effect and improving the utilization of residual oil.</p>

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Mechanism of Improving Oilfield Recovery by High-Volume Water Injection without Proppant

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Xiang Zhu,
  • Niubin Zhao,
  • Yi Qin,
  • Dongdong Wang,
  • Guoyu Chu,
  • Wenjing Liu

摘要

This study used laboratory core experiments, combined with flow characteristics, oil displacement effect, oil-water interface effect and other aspects to systematically explore the effect of high-displacement water injection on oil field recovery under proppant-free conditions. The experimental results show that with the increase of water injection rate, the flow velocity and pressure gradient increase significantly. When the water injection rate increases from 5 L/min to 12 L/min, the flow velocity increases by 82% and the pressure gradient increases by 112%. In terms of oil-water interface optimization, after the water injection rate increases, the oil-water interface instability index increases from 0.45 to 0.79, and the emulsification degree increases to 25.3%, indicating that the shear force enhancement is conducive to improving oil displacement efficiency. High-displacement water injection also effectively promotes the utilization of residual oil. When the water injection rate is 12 L/min, the residual oil saturation in the core decreases by 15.3%. High-displacement proppant-free water injection can significantly improve the recovery of low permeability reservoirs, mainly by enhancing hydraulic drive, optimizing oil-water interface effect and improving the utilization of residual oil.