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首页> 外文期刊>Applied Nanoscience >Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces
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Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces

机译：具有覆盆子状形态和表面活性剂的二氧化硅基纳米结构对轻质，中质和重质原油在油水界面的界面行为的影响

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Any efficient exploitation of new petroleum reservoirs necessitates developing methods to mobilize the crude oils from such reservoirs. Here silicon dioxide nanoparticles (SiO2 NPs) were used to improve the efficiency of the chemical-enhanced oil recovery process that uses surfactant flooding. Specifically, SiO2 NPs (i.e., 0, 0.001, 0.005, 0.01, 0.05, and 0.1 wt%) and Tween?20, a nonionic surfactant, at 0, 0.5, and 2 critical micelle concentration (CMC) were varied to determine their effect on the stability of nanofluids and the interfacial tension (IFT) at the oil–aqueous interface for 5 wt% brine-surfactant-SiO2 nanofluid-oil systems for West Texas Intermediate light crude oil, Prudhoe Bay medium crude oil, and Lloydminster heavy crude oil. Our study demonstrates that SiO2 NPs may either decrease, increase the IFT of the brine-surfactant-oil systems, or exhibit no effects at all. For the brine-surfactant-oil systems, the constituents of the oil and aqueous substances affected the IFT behavior, with the nanoparticles causing a contrast in IFT trends according to the type of crude oil. For the light oil system (0.5 and 2 CMC Tween?20), the IFT increased as a function of SiO2 NP concentration, while a threshold concentration of SiO2 NPs was observed for the medium (0.5 and 2 CMC Tween?20) and heavy (2 CMC Tween?20) oil systems in terms of IFT trends. Concentrations below the SiO2 NP threshold concentration resulted in a decrease in IFT, and concentrations above this threshold resulted in an increase in IFT. The IFT decreased until the NP concentration reached a threshold concentration where synergetic effects between nonionic surfactants and SiO2 NPs are the opposite and result in antagonistic effects. Adsorption of both SiO2 NPs and surfactants at an interface caused a synergistic effect and an increased reduction in IFT. The effectiveness of the brine-surfactant-SiO2 nanofluids in decreasing the IFT between the oil-aqueous phase for the three tested crude oils were ranked as follows: (1) Prudhoe Bay?>?(2) Lloydminster?>?and (3) West Texas Intermediate. The level of asphaltenes and resins in these crude oil samples reflected these rankings. A decrease in the IFT also indicated the potential of the SiO2 NPs to decrease capillary pressure and induce the movement and recovery of oil in original water-wet reservoirs. Conversely, an increase in IFT indicated the potential of SiO2 NPs to increase capillary pressure and oil recovery in reservoirs subject to wettability reversal under water-wet conditions. Raspberry-like morphology particles were discovered in 5 wt% brine-surfactant-SiO2 nanofluid-oil systems. The development of raspberry-like particles material with high surface area, high salt stability, and high capability of interfaces alteration and therefore wettability changes offers a wide range of applications in the fields of applied nanoscience, environmental engineering, and petroleum engineering.
机译：对新的石油储层的任何有效开采都需要开发出从这些储层中调集原油的方法。在此，使用二氧化硅纳米颗粒（SiO 2 NPs）来提高使用表面活性剂驱油的化学强化采油过程的效率。具体地说，SiO 2 NPs（即0、0.001、0.005、0.01、0.05和0.1 wt％）和非离子表面活性剂Tween ？ 20分别为0、0.5 ，并改变2个临界胶束浓度（CMC），以确定它们对5 wt％盐水-表面活性剂-SiO 2 的纳米流体稳定性和油水界面的界面张力（IFT）的影响。西德克萨斯中质轻质原油，普拉德霍湾中质原油和劳埃德明斯特重质原油的纳米流体油系统。我们的研究表明，SiO 2 NPs可能会降低，增加盐水表面活性剂-油系统的IFT或完全没有作用。对于盐水表面活性剂-油系统，油和水性物质的成分会影响IFT行为，而纳米颗粒会根据原油类型而引起IFT趋势的对比。对于轻油系统（0.5和2 CMC Tween ？ 20），IFT作为SiO 2 NP浓度的函数而增加，而SiO 的阈值浓度就IFT趋势而言，在中度（0.5和2 CMC Tween ？ 20）和重度（2 CMC Tween ？ 20）油系统中观察到2 NPs。 。低于SiO 2 NP阈值浓度的浓度会导致IFT降低，而高于该阈值的浓度则会导致IFT升高。 IFT下降直至NP浓度达到阈值浓度，此时非离子表面活性剂与SiO 2 NP之间的协同作用相反，并产生拮抗作用。 SiO 2 NPs和表面活性剂在界面上的吸附均产生协同作用，并增加了IFT的降低。三种表面活性剂用盐水表面活性剂SiO 2 纳米流体降低油水相之间IFT的效果如下：（1）Prudhoe Bay？>？（2）劳埃德敏斯特（Lloydminster）和？（3）西德克萨斯中级。这些原油样品中的沥青质和树脂含量反映了这些排名。 IFT的降低也表明SiO 2 NPs可能降低毛细压力，并诱导原始水润湿油藏中的油运动和恢复。相反，IFT的增加表明SiO 2 NPs在水湿条件下发生润湿性反转的储层中可能会增加毛细压力和采油率。在5％（重量）的盐水表面活性剂-SiO 2 纳米流体-油体系中发现了树莓状的形态颗粒。具有高表面积，高盐稳定性和高界面改变能力以及因此可湿性改变的树莓状颗粒材料的开发提供了在应用纳米科学，环境工程和石油工程领域中的广泛应用。

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