Scholarlink

<p>The integration of Carbon Capture, Utilization, and Storage (CCUS) with Enhanced Oil Recovery (EOR) in low-permeability reservoirs is frequently hindered by severe capillary entrapment and viscous fingering, leading to suboptimal macroscopic sweep efficiency. To overcome these hydrodynamic limitations, this study proposes a novel Pulse-Resonance Water-Alternating-Gas (PRWAG) injection strategy. By coupling a the- oretical oscillator model with a one-dimensional transient multiphase flow simulation, the dynamic displacement mechanisms under high-frequency harmonic modulation were rigorously investigated. The results reveal a non-monotonic, “inverted U-shape” scaling relationship between the ultimate recovery and the dimensionless Strouhal number (St). Matching the injection frequency with the natural frequency of the fluid-solid system (St ≈ 1.25) maximizes wave energy transfer and effectively exceeds the capillary entry pressure. Macroscopically, the PR-WAG strategy yields a remarkable ultimate recovery of 44.5%, significantly outperforming conventional water flooding (32%) and Constant- Rate WAG (38%). The recovery exhibits a distinct stepwise growth characteristic driven by the microscopic “stick-slip” mobilization of trapped oil clusters. Furthermore, the oscil- latory pressure field dynamically redistributes the fluids, retarding the water breakthrough time from 0.35 PV to 0.75 PV and suppressing viscous fingering to establish a stable, piston-like displacement front. This study not only elucidates the underlying physical mechanisms of pulse-resonance displacement but also provides a robust theoretical and engineering framework for optimizing fieldscale CCUS-EOR processes.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dynamic Displacement Mechanisms and Scaling Analysis of Pulse-Resonance WAG Injection in Low-Permeability Reservoirs

  • 期刊论文

  • 发表日期：

    2026年6月24日

查看全文
  • Zeyu Zhao,
  • Nike Liu,
  • Hao Li,
  • Zimai Liu,
  • Chenyang Cui,
  • Gaojie Yuan

摘要

The integration of Carbon Capture, Utilization, and Storage (CCUS) with Enhanced Oil Recovery (EOR) in low-permeability reservoirs is frequently hindered by severe capillary entrapment and viscous fingering, leading to suboptimal macroscopic sweep efficiency. To overcome these hydrodynamic limitations, this study proposes a novel Pulse-Resonance Water-Alternating-Gas (PRWAG) injection strategy. By coupling a the- oretical oscillator model with a one-dimensional transient multiphase flow simulation, the dynamic displacement mechanisms under high-frequency harmonic modulation were rigorously investigated. The results reveal a non-monotonic, “inverted U-shape” scaling relationship between the ultimate recovery and the dimensionless Strouhal number (St). Matching the injection frequency with the natural frequency of the fluid-solid system (St ≈ 1.25) maximizes wave energy transfer and effectively exceeds the capillary entry pressure. Macroscopically, the PR-WAG strategy yields a remarkable ultimate recovery of 44.5%, significantly outperforming conventional water flooding (32%) and Constant- Rate WAG (38%). The recovery exhibits a distinct stepwise growth characteristic driven by the microscopic “stick-slip” mobilization of trapped oil clusters. Furthermore, the oscil- latory pressure field dynamically redistributes the fluids, retarding the water breakthrough time from 0.35 PV to 0.75 PV and suppressing viscous fingering to establish a stable, piston-like displacement front. This study not only elucidates the underlying physical mechanisms of pulse-resonance displacement but also provides a robust theoretical and engineering framework for optimizing fieldscale CCUS-EOR processes.