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<p>This study develops an optimized nanoemulsion for efficient oil-based drilling fluid (OBDF) removal, and the unique removal mechanisms of nanoemulsion are studied. Compared to surfactant solutions, the nanoemulsion exhibits enhanced wettability on solid surfaces and lower interfacial tension against oil phases (&lt; 0.1 mN·m<sup>−1</sup>), synergistically facilitating OBDF detachment through three mechanisms: low interfacial tension, wettability enhancement, and disjoining pressure effects. Enhanced emulsification produced monodisperse micron droplets under shear, overcoming Laplace resistance through pre-organized interfacial films. The synergistic combination of enhanced wettability (contact angle reduction to 25.4°) and nanoscale droplet dimensions (147&#xa0;nm) significantly improves nanoemulsion permeation through OBDF filter cakes. These combined properties improve the removal effect of OBDF, while interfacial bonding strength at cement-casing (3.02&#xa0;MPa) and cement-formation (2.74&#xa0;MPa) interfaces matched pristine samples. These elucidated mechanisms provide theoretical guidance for formulating and optimizing nanoemulsion-based flushing fluids, while also facilitating their broader applications in fields such as enhanced oil recovery and environmental remediation.</p> Graphical abstract <p></p>

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Preparation of nanoemulsions for oil-based drilling fluid removal and action mechanism

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Renzhou Meng,
  • Xiujian Xia,
  • Yongjin Yu,
  • Fengzhong Qi,
  • Chi Zhang,
  • Jinsheng Sun,
  • Haige Wang

摘要

This study develops an optimized nanoemulsion for efficient oil-based drilling fluid (OBDF) removal, and the unique removal mechanisms of nanoemulsion are studied. Compared to surfactant solutions, the nanoemulsion exhibits enhanced wettability on solid surfaces and lower interfacial tension against oil phases (< 0.1 mN·m−1), synergistically facilitating OBDF detachment through three mechanisms: low interfacial tension, wettability enhancement, and disjoining pressure effects. Enhanced emulsification produced monodisperse micron droplets under shear, overcoming Laplace resistance through pre-organized interfacial films. The synergistic combination of enhanced wettability (contact angle reduction to 25.4°) and nanoscale droplet dimensions (147 nm) significantly improves nanoemulsion permeation through OBDF filter cakes. These combined properties improve the removal effect of OBDF, while interfacial bonding strength at cement-casing (3.02 MPa) and cement-formation (2.74 MPa) interfaces matched pristine samples. These elucidated mechanisms provide theoretical guidance for formulating and optimizing nanoemulsion-based flushing fluids, while also facilitating their broader applications in fields such as enhanced oil recovery and environmental remediation.

Graphical abstract