Emulsification in a microfluidic flow-focusing device: Effect of the dispersed phase viscosity

Liu, Zheyu; Chai, Maojie; Chen, Xin; Hejazi, S. Hossein; Li, Yiqiang

doi:10.1016/j.fuel.2020.119229

Cited by 57 publications

(30 citation statements)

References 52 publications

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“…where h w (cm) is the height of the lower interface of crude oil in initial state, Δh (cm) is the correction height, C is the relative coefficient between oil displacement agent and crude oil, dimensionless, ρ o (g/cm 3 ) is the density of crude oil at the experimental temperature, ρ w (g/cm 3 ) is the density of oil displacement agent at the experimental temperature, η o (mPa• s) is the viscosity of crude oil at the experimental temperature, mPa•s, and η w (mPa•s) is the viscosity of oil displacement agent at the experimental temperature.…”

Section: Dynamic Emulsification Characterizermentioning

confidence: 99%

“…1,2 As reported in the oil field, more than two-thirds of crude oil is produced in the emulsion form. 3 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. 4−6 On the one hand, in situ emulsification between chemical agents and crude oil can disperse into small oil droplets to decrease oil saturation.…”

Section: Introductionmentioning

confidence: 99%

“…Emulsions are defined as a type of dispersion system composed of immiscible liquids that are dispersed in another in the form of drops. 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%

See 2 more Smart Citations

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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Section: Dynamic Emulsification Characterizermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Moreover, the remaining oil will be detached from the rock surface and dispersed into several small oil droplets when the SP solution flows over the adsorbed oil on the rock surface [8]. Furthermore, the large oil droplets will also be gradually dispersed into smaller oil droplets under the coaction of shear force and interfacial tension force, which result the formation of oil-in-water (O/W) emulsions or water-inoil (W/O) emulsions [9,10]. Emulsification has been widely observed in a large number of laboratory and field tests.…”

Section: Introductionmentioning

confidence: 99%

Effect of Emulsification on Enhanced Oil Recovery during Surfactant/Polymer Flooding in the Homogeneous and Heterogeneous Porous Media

Wang

Zhang²,

Yuan³

et al. 2021

Geofluids

Self Cite

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Surfactant polymer (SP) flooding has become an important enhanced oil recovery (EOR) technique for the high-water cut mature oilfield. Emulsification in the SP flooding process is regarded as a powerful mark for the successful application of SP flooding in the filed scale. People believe emulsification plays a positive role in EOR. This paper uses one-dimensional homogenous core flooding experiments and parallel core flooding experiments to examine the effect of emulsification on the oil recoveries in the SP flooding process. 0.3 pore volume (PV) of emulsions which are prepared using ultralow interface intension (IFT) SP solution and crude oil with stirring method was injected into core models to mimic the emulsification process in SP flooding, followed by 0.35 PV of SP flooding to flood emulsions and remaining oil. The other experiment was preformed 0.65 PV of SP flooding as a contrast. We found SP flooding can obviously enhance oil recovery factor by 25% after water flooding in both homogeneous and heterogeneous cores. Compared to SP flooding, emulsification can contribute an additional recovery factor of 3.8% in parallel core flooding experiments. But there is no difference on recoveries in homogenous core flooding experiments. It indicates that the role of emulsification during SP flooding will be more significant for oil recoveries in a heterogeneous reservoir rather than a homogeneous reservoir.

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“…In several studies the influence of process parameters like transmembrane pressure [2], dispersed and continuous phase velocity [3], membrane porosity, and pore size [4], [5] were investigated. On the other hand, the influence of fluid properties like dispersed phase fraction, dispersed and continuous phase viscosity's as well as surfactant concentrations were quantified by several authors [6], [3], [5], [7]. In particular, the influence of surfactants on the final emulsion is widely discussed but not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of capillary driven droplet breakup due to fluiddynamic instabilities

Giefer

Fritsching

2021

ICLASS

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The membrane emulsification process obtains the advantage to formulate liquid/liquid systems in a low shear stress process. Whereas the emulsification process and the influence of the membrane structure and geometry on the final product are well investigated, the liquid deformation and liquid dispersion process inside the membrane structure are quite unknown. In the present study, the droplet breakup mechanism in the vicinity of a solid wall is numerically investigated with OpenFoam using the Volume of Fluid Method. Different wetting conditions on the membrane wall have been implemented. The results show a relation between wetting properties and fluid dynamic disturbances' resp. instabilities that may grow to larger instabilities, resulting in droplet breakup inside the membrane. These results can be used to find the sweet spot of capillary driven droplet breakup with minimum shear force to handle shear sensitive media while keeping a defined mono disperse emulsion.

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Emulsification in a microfluidic flow-focusing device: Effect of the dispersed phase viscosity

Cited by 57 publications

References 52 publications

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

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

Effect of Emulsification on Enhanced Oil Recovery during Surfactant/Polymer Flooding in the Homogeneous and Heterogeneous Porous Media

Numerical investigation of capillary driven droplet breakup due to fluiddynamic instabilities

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