Abstract Emulisons stabilized by surfactants have been used in enhanced oil recovery (EOR) for effective profile control and displacement, whereas the lack of long-term stability especially under harsh reservoir conditions limited their wide application. In this study, Pickering emulsions stabilized by sodium dodecylbenzenesulfonate (SDBS) and anisotropic slice-like AlOOH nanoparticles were systematically studied. The adsorption of SDBS on AlOOH nanoparticles was confirmed by the measurements of zeta potential and Fourier Transform Infrared (FTIR) spectra. The three-phase contact angle tests were conducted to explore the reason for the double phase inversion of the AlOOH/SDBS stabilized emulsions from o/w to w/o and back to o/w again. The optical microscopy images verified the adsorption mechanism of SDBS on AlOOH nanoparticles at the oil/water interface. It was found that the three-dimensional network structure formed by the micro-flocculated modified AlOOH nanoparticles could prevent coalescence and phase separation, resulting in the enhanced stability of the emulsion. The AlOOH/SDBS stabilized emulsion showed the super tolerances in a wide range of shear rates, temperature and electrolyte concentrations. The core flooding tests and microscopic visualization flooding experiments demonstrated that the AlOOH/SDBS stabilized emulsions significantly improved the tertiary oil recovery (33 % of IOIP) via the enhanced displacement and sweep efficiencies. The present study provides a typical Pickering emulsion with great stability under harsh reservoir conditions for EOR.

中文翻译：

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AlOOH纳米粒子对提高采收率的十二烷基苯磺酸钠稳定o/w乳液稳定性影响的研究

摘要 表面活性剂稳定的乳化液已被用于提高采收率（EOR）中以实现有效的调剖和驱替，但缺乏长期稳定性，尤其是在恶劣的储层条件下，限制了其广泛应用。在这项研究中，系统研究了由十二烷基苯磺酸钠 (SDBS) 和各向异性切片状 AlOOH 纳米粒子稳定的 Pickering 乳液。通过 zeta 电位和傅立叶变换红外 (FTIR) 光谱的测量证实了 SDBS 在 AlOOH 纳米粒子上的吸附。进行三相接触角测试以探讨 AlOOH/SDBS 稳定的乳液从 o/w 到 w/o 并再次返回到 o/w 的双相转化的原因。光学显微镜图像验证了 SDBS 在油/水界面处的 AlOOH 纳米颗粒上的吸附机制。结果表明，微絮凝的改性AlOOH纳米粒子形成的三维网络结构可以防止聚结和相分离，从而提高乳液的稳定性。AlOOH/SDBS 稳定的乳液在广泛的剪切速率、温度和电解质浓度范围内显示出超耐受性。岩心驱油试验和显微可视化驱油实验表明，AlOOH/SDBS 稳定的乳液通过提高驱油和波及效率显着提高了三次采油率（IOIP 的 33%）。本研究提供了一种典型的 Pickering 乳剂，该乳剂在用于 EOR 的恶劣油藏条件下具有很好的稳定性。结果表明，微絮凝的改性AlOOH纳米粒子形成的三维网络结构可以防止聚结和相分离，从而提高乳液的稳定性。AlOOH/SDBS 稳定的乳液在广泛的剪切速率、温度和电解质浓度范围内显示出超耐受性。岩心驱油试验和显微可视化驱油实验表明，AlOOH/SDBS 稳定的乳液通过提高驱替和波及效率显着提高了三次采油率（IOIP 的 33%）。本研究提供了一种典型的 Pickering 乳剂，该乳剂在用于 EOR 的恶劣油藏条件下具有很好的稳定性。结果表明，微絮凝的改性AlOOH纳米粒子形成的三维网络结构可以防止聚结和相分离，从而提高乳液的稳定性。AlOOH/SDBS 稳定的乳液在广泛的剪切速率、温度和电解质浓度范围内显示出超耐受性。岩心驱油试验和显微可视化驱油实验表明，AlOOH/SDBS 稳定的乳液通过提高驱替和波及效率显着提高了三次采油率（IOIP 的 33%）。本研究提供了一种典型的 Pickering 乳剂，该乳剂在用于 EOR 的恶劣油藏条件下具有很好的稳定性。