盐度响应ZnO/PEG纳米复合材料对不同地层非混相流体驱替和界面行为的影响

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-04-10 DOI:10.1016/j.molliq.2025.127462

Milad Omidvar , MohammadHossein Shabani , Naser Asadzadeh , Arezou Jafari , Zahra Fakhroueian , Ebrahim Biniaz-Delijani

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引用次数: 0

摘要

研究了氧化锌/聚乙二醇（ZnO/PEG-6000）纳米复合材料（NC）对提高采收率（EOR）应用中非混相流体驱油效率的影响。采用共沉淀法合成ZnO/PEG NC，加入亲水性表面活性剂如Tween-80、壬基酚聚氧乙酸酯（Non-10EO）和十二烷基硫酸钠（SDS）以减轻团聚。进一步采用柠檬酸（CA）作为表面改性剂来提高NC的亲水性。利用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电镜（SEM）、动态光散射（DLS）和热重分析（TGA）等综合表征技术对NC的结构和形态进行了表征。通过不同NC浓度随时间的沉降试验，评估了ZnO/PEG-6000 NC在去离子水（DIW）和海水（SW）中的胶体稳定性。结果表明，1 wt%的NC在DIW和SW中表现出最佳的性能，这归因于油水界面的表面吸附增强。在静电相互作用和“盐入效应”机制的驱动下，NC有利于形成稳定的乳状液，降低原油与水之间的界面张力和接触角。最终，在不同结构的微模型中进行的驱油效率测试表明，sw基ZnO/PEG NC （1 wt%）通过与Pickering乳化液理论一致的机制显著提高了原油采收率。此外，在裂缝结构中，NC （sw基ZnO/PEG @ 1 wt%）可使采收率提高12%（69%的总OOIP，原始油），而常规地层的OOIP为57%。值得注意的是，压裂系统的采收率提高归因于驱替流体绕过低渗透区域，减少了毛细力的主导作用，这一点通过流体-流体驱替测试的可视化证明了。

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Efficiency of salinity-responsive ZnO/PEG nanocomposite on the immiscible fluid-fluid displacement and interface behavior in different formations

This study investigates the influence of zinc oxide/polyethylene glycol (ZnO/PEG-6000) nanocomposite (NC) on the efficiency of immiscible fluid–fluid displacement, relevant to enhanced oil recovery (EOR) applications. The ZnO/PEG NC was synthesized via a co-precipitation method, incorporating hydrophilic surfactants such as Tween-80, nonylphenol ethoxylate (Non-10EO), and sodium dodecyl sulfate (SDS) to mitigate agglomeration. Citric acid (CA) was further employed as a surface modifier to enhance the NC’s hydrophilicity. Comprehensive characterization techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), dynamic light scattering (DLS), and thermogravimetric analysis (TGA), were used to confirm the structural and morphological properties of the NC. The colloidal stability of the ZnO/PEG-6000 NC was assessed in deionized water (DIW) and seawater (SW), representing salinity-responsive base fluids, through sedimentation tests at varying NC concentrations over time. The results demonstrated that 1 wt% NC in both DIW and SW exhibited optimal performance, attributed to enhanced surface adsorption at the oil–water interface. The NC facilitated the formation of stable emulsions, reducing interfacial tension (IFT) and contact angle between crude oil and water, driven by electrostatic interactions and the “salt entry effect” mechanism. Eventually, displacement efficiency tests in micromodels with varying structures revealed that the SW-based ZnO/PEG NC (1 wt%) achieved a significant increase in oil recovery through mechanisms consistent with Pickering emulsion theory. Furthermore, in fractured structures, the NC (SW-based ZnO/PEG @ 1 wt%) enabled an additional oil recovery of 12 % (69 % total OOIP, original oil in place) compared to 57 % OOIP in conventional formation. Notably, the enhanced oil recovery in fractured systems attribute to the bypassing of low-permeability regions by the displacing fluid, reducing capillary force dominance, which was proved by visualization of fluid–fluid displacement tests.

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.