Advances of microemulsion and its applications for improved oil recovery

Zhu, Tongyu; Kang, Wanli; Yang, Hongbin; Li, Zhe; Zhou, Bobo; He, Yingqi; Wang, Jiaqi; Aidarova, Saule; Sarsenbekuly, Bauyrzhan

doi:10.1016/j.cis.2021.102527

Cited by 75 publications

(37 citation statements)

References 150 publications

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“…The existing methods for HTS preparation heavily rely on a hard template to induce hollow structures, thus inevitably involving a template fabrication and removal process, making the preparation laborious, complicated, and costly. − Therefore, versatile methods without a template fabrication and removal process are needed to simplify the preparation of HTS. A microemulsion is a thermodynamically stable, isotropic, transparent/translucent emulsion system formed by two immiscible liquids under the action of a surfactant and cosurfactant, − in which the surfactant-stabilized microcavity can serve as a nanoreactor in the synthesis of solid nanoparticles . When the nucleation and growth reaction is confined to the microcavity boundary with the sphere-shell material highly insoluble in the droplet phase, − it possesses the capability to enable a direct synthesis of hollow cavity with an oil phase as a template.…”

Section: Introductionmentioning

confidence: 99%

Controllable Microemulsion Synthesis of Hybrid TiO₂–SiO₂ Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

et al. 2022

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Hollow structures in TiO 2 materials can enhance the photocatalytic properties by reducing the diffusion length and improving the accessibility of active sites for the reactants. However, existing approaches for preparing hollow TiO 2 materials have two drawbacks that restrict their engineering applicability: first, a heavy reliance on templates to form a hollow structure, which makes the preparation laborious, complicated, and costly; second, difficult-to-achieve high crystallization while maintaining the small grain size in calcinated TiO 2 , which is crucial for enhancing photocatalytic activity. Herein, a simple, effective method is proposed that not only enables the preparation of hybrid TiO 2 −SiO 2 hollow spheres without the template fabrication and removal process via microemulsion technology but also achieves both high crystallization and a small grain size in calcinated TiO 2 at once through the calcination of amorphous TiO 2 with organosilane at a high temperature of 850 °C. The prepared TiO 2 − SiO 2 hollow spheres with tunable sizes demonstrate high photocatalytic activity with a maximum k value of 133.74 × 10 −3 min −1 , which is superior to commercial photocatalyst P25 (k = 114.97 × 10 −3 min −1 ). In addition, Au can be doped in the hybrid TiO 2 − SiO 2 shell to gain Au-doped hollow spheres that show a high k value of up to 694.14 × 10 −3 min −1 , which is 6 times larger than that of P25 and much better than that reported in the literature. This study not only provides an effective approach to stabilize and tune the grain growth of the TiO 2 photocatalyst during calcination but also enables the simple preparation of hollow TiO 2 -based materials with controllable hollow nanostructures.

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Section: Introductionmentioning

confidence: 99%

Controllable Microemulsion Synthesis of Hybrid TiO₂–SiO₂ Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

et al. 2022

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“…Wang Xin (2021) have taken the droplet as the macro research object, and the creep models of five dynamic states are given. Zhu Tongyu (Zhu et al 2021;Wang et al 2019;) summarized microemulsion in EOR, and evaluated the characteristics of microemulsion system and phase transformation as a whole. Most of the above studies are from macroscopic perspective to study the effect of temperature and pressure on microemulsion phase change, and lack of micro angle microemulsion phase change mechanism.…”

Section: Introductionmentioning

confidence: 99%

Influencing factors and microscopic formation mechanism of phase transitions of microemulsion system

Dongqi

Yin

Wang³

et al. 2022

J Petrol Explor Prod Technol

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As a surfactant solution system, microemulsion has attracted much attention due to its ultra-low interfacial tension, high solubilization and thermodynamic stability in the process of enhanced oil recovery. Different from water phase system of polymer flooding and ASP flooding, the microemulsion system shows a special phase state, and its existence system may be water phase, oil phase or microemulsion phase. The microemulsion phase can be divided into upper phase, middle phase and lower phase microemulsion according to the composition of the system. Different phase microemulsions have different oil displacement efficiency, and the middle phase microemulsion reaches ultra-low interfacial tension with oil/water, and the oil displacement efficiency is the highest. In order to ensure the middle-phase microemulsion flooding as far as possible during the oil displacement process, it is necessary to study the phase change process of microemulsion and the formation conditions of microemulsion in detail, and clarify the influence of surfactant concentration, additive concentration, salt content, water–oil ratio and temperature on the microemulsion phase transformation and the formation mechanism of microemulsion. The research results have some guiding significance for the formulation selection and slug design of microemulsion flooding system.

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“…Oil–water emulsification and emulsions are extensively applied in many technical fields, such as medicine, cosmetics, food, chemicals, petroleum industry, and so on. , As reported in the oil field, more than two-thirds of crude oil is produced in the emulsion form . Especially in the enhanced oil recovery (EOR) stage of crude oil production, emulsification has been demonstrated as an important mechanism to extend the lifetime of oil fields. − On the one hand, in situ emulsification between chemical agents and crude oil can disperse into small oil droplets to decrease oil saturation. , On the other hand, the emulsions migrating in the porous media can block pores by the Jiamin effect thereby improving the sweep efficiency of reservoir. − Therefore, it is of significance to prepare some unique surfactants with the features that are easy to emulsify with crude oil under microshear reservoir conditions and maintain an effective emulsion stability behavior.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method to Characterize Dynamic Emulsions Generation and Separation of Crude Oil–Water System

Yue

Zou

et al. 2022

Ind. Eng. Chem. Res.

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The evaluation of the ease to generate emulsions and emulsions stability of oil−water system is essential for the investigation and application of chemical flooding technology for the enhanced oil recovery (EOR). However, the previous characterization methods have mainly focused on emulsion stability. To fill this gap, this study designed a novel instrument for visualizing the presence of emulsions and the separation of an oil−water system. Thereafter it also proposed quantitative methods: the emulsification index (EI) for characterizing the ease of surfactants to generate emulsions with crude oil and the demulsification index (DI) for describing emulsion stability. The results show that EI and DI can accurately characterize the dynamic characteristics of emulsions generation and demulsification, respectively. On the basis of the numerous test data composed by three crude oils and seven surfactants with different concentrations, the emulsifying capability and emulsion stability of different oil−water samples can be quantitatively determined. More importantly, these differences between various oil−water samples caused by surfactant concentration, surfactant types and crude oil property can also be accurately distinguished. Besides, the core flooding tests also provide support for the EI and DI and are reasonable parameters for characterization of the emulsification capability and emulsion stability of oil−water systems. Therefore, the overall investigations ultimately revealed that the parameters EI and DI can be used to determine ease of emulsion generation and separation of oil−water systems with an acceptable level of accuracy. The findings of this study provide a novel method for preparing effective chemical agents, which is useful for EOR fields with economic returns.

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Advances of microemulsion and its applications for improved oil recovery

Cited by 75 publications

References 150 publications

Controllable Microemulsion Synthesis of Hybrid TiO₂–SiO₂ Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

Controllable Microemulsion Synthesis of Hybrid TiO₂–SiO₂ Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

Influencing factors and microscopic formation mechanism of phase transitions of microemulsion system

A Novel Method to Characterize Dynamic Emulsions Generation and Separation of Crude Oil–Water System

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Advances of microemulsion and its applications for improved oil recovery

Cited by 75 publications

References 150 publications

Controllable Microemulsion Synthesis of Hybrid TiO2–SiO2 Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

Controllable Microemulsion Synthesis of Hybrid TiO2–SiO2 Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

Influencing factors and microscopic formation mechanism of phase transitions of microemulsion system

A Novel Method to Characterize Dynamic Emulsions Generation and Separation of Crude Oil–Water System

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Product

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Controllable Microemulsion Synthesis of Hybrid TiO₂–SiO₂ Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

Controllable Microemulsion Synthesis of Hybrid TiO₂–SiO₂ Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity