Synergetic effect of resins and asphaltenes on water/oil interfacial properties and emulsion stability

Liu, Daiwei; Li, Chuanxian; Yang, Fei; Sun, Guangyu; You, Jhih-Shih; Cui, Kaixiang

doi:10.1016/j.fuel.2019.04.159

Cited by 76 publications

(36 citation statements)

References 36 publications

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“…In the colloidal dispersion system of crude oil, the asphaltenes are in the form of micellar nuclei, which are stabilized by the adsorbed resins [86] . The stability of asphaltene micelles is also affected by the ratio of asphaltenes and resins, aromatic degree, and other parameters [87] . The increase in the size of asphaltene micelles results in a higher viscosity of crude oil [88] .…”

Section: Crude Oil Viscosity Reductionmentioning

confidence: 99%

Recent advances in applications of power ultrasound for petroleum industry

Luo

Gong

et al. 2021

Ultrasonics Sonochemistry

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Section: Crude Oil Viscosity Reductionmentioning

confidence: 99%

Recent advances in applications of power ultrasound for petroleum industry

Luo

Gong

et al. 2021

Ultrasonics Sonochemistry

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“…For spread layers, also no time effects are observed, consistent with the surface coverage being the control parameter, so in-plane cross-linking is an unlikely cause of the aging observed in the earlier literature. Of course, real crude oil possesses higher complexity and other effects such as of solubility of asphaltenes depending on crude oil composition (aliphatic/aromatic ratio), interplay with resins, − the possible enhancement of emulsion stability due to the presence of fine inorganic solid particles, , among others, are still not clear. Albeit working with planar and model insoluble interfaces that emphasize the colloidal nature of these asphaltene layers, these show significant solid-like behavior with monotonic increases in moduli with surface concentration, which can be expected to remain the key parameter in determining the nature of the stress boundary condition governing the drainage of liquid during droplet–droplet interactions when asphaltenes are in a more complex environment.…”

Section: Discussionmentioning

confidence: 99%

Assessing the Interfacial Activity of Insoluble Asphaltene Layers: Interfacial Rheology versus Interfacial Tension

Alicke

Simon²,

Sjöblom³

et al. 2020

Langmuir

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Asphaltenes have been suggested to play an important role in the remarkable stability of some water-in-crude oil emulsions, although the precise mechanisms by which they act are not yet fully understood. Being one of the more polar fractions in crude oils, asphaltenes are surface active and strongly adsorb at the oil/water interface, and as the interface becomes densely packed, solid-like mechanical properties emerge, which influence many typical interfacial experiments. The present work focuses on purposefully measuring the rheology in the limit of an insoluble, spread Langmuir monolayer in the absence of adsorption/desorption phenomena. Moreover, the changes in surface tension are deconvoluted from the purely mechanical contribution to the surface stress by experiments with precise interfacial kinematics. Compression “isotherms” are combined with the measurement of both shear and dilatational rheological properties to evaluate the relative contributions of mechanical versus thermodynamic aspects, i.e., to evaluate the “interfacial rheological” versus the standard interfacial activity. The experimental results suggest that asphaltene nanoaggregates are not very efficient in lowering interfacial tension but rather impart significant mechanical stresses. Interestingly, physical aging effects are not observed in the spread layers, contrary to results for adsorbed layers. By further studying asphaltene fractions of different polarity, we investigate whether mere packing effects or strong interactions determine the mechanical response of the dense asphaltene systems as either soft glassy or gel-like responses have been reported. The compressional and rheological data reflect the dense packing, and the behavior is captured well by the soft glassy rheology model, but a more complicated multilayer structure may develop as coverage is increased. Potential implications of the experimental observations on these model and insoluble interfaces for water-in-crude oil emulsion stability are briefly discussed.

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“…Although the adjustment and optimization of the global energy structure have decreased the rate of traditional fossil energy demand growth, the oil demand of major developing countries is still increasing, which makes oil recovery enhancement an important direction of oil field development and construction [1]. The chemical flooding technology represented by alkali/surfactant/polymer (ASP) flooding has been applied in Daqing oilfield as an efficient enhanced oil recovery method [2][3][4], while the chemical agent components such as surfactant and polymer will affect the stability of crude oil emulsion, which will bring challenges to the efficient oilwater separation of oilfield gathering and transportation system [2,[4][5][6][7][8][9]. However, to research the emulsion stability of chemical flooding produced liquid, it is necessary to master the emulsion mechanism of the crude oil emulsion.…”

Section: Introductionmentioning

confidence: 99%

“…As important natural components in crude oil, asphaltene and resin are the two types of substances with the largest molecular weight and polarity. Meanwhile, they have strong interfacial activity, so they are generally regarded as natural surface active substances [8][9][10][11]. The promoting effect of polar molecules such as asphaltene and resin on the formation and stabilization of oil-water emulsion has been confirmed in many experiments.…”

Section: Introductionmentioning

confidence: 99%

Effect of Polar Molecule Aggregation on the Stability of Crude Oil/Water Interface: A Molecular Simulation Study

Zhao¹,

Xia²,

Wang³

et al. 2021

Lithosphere

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To ensure the efficient operation of crude oil dehydration and sewage treatment technology in oilfield surface production system, the effect mechanism of polar components represented by asphaltene and resin on the formation and stability of oil-water emulsion needs to be revealed at nanoscale. In this paper, the molecular dynamics simulation method was used to construct the crude oil/polar component/water system models with different molar ratios of asphaltene to resin by adjusting the number of asphaltene and resin molecules, so as to reveal the molecular arrangement and aggregation process and film forming characteristics of asphaltene, resin, and their mixture at the oil-water interface. The simulated results showed that the aggregation process of asphaltene molecules under the influence of hydrogen bonds can be divided into three stages. The addition of resin molecules enhanced the connection between molecules of all polar components at the interface. The π−π stacking and T-shaped stacking structures were found in all aggregations, and the higher the molar ratio of asphaltene molecules, the higher the proportion of π−π stacking structure. With the increase of the molar ratio of asphaltene to resin increases from 0 : 1 to 1 : 0, the interfacial film thickness and interface formation energy increase from 2.366 nm and -143.89 kJ/mol to 3.796 nm and -304.09 kJ/mol, respectively, which indicated that asphaltene molecules play a more significant role in promoting the formation of interfacial film and maintaining its structural stability than resin molecules. The investigations in this study provide theoretical support for demulsification of the crude oil emulsion.

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Synergetic effect of resins and asphaltenes on water/oil interfacial properties and emulsion stability

Cited by 76 publications

References 36 publications

Recent advances in applications of power ultrasound for petroleum industry

Recent advances in applications of power ultrasound for petroleum industry

Assessing the Interfacial Activity of Insoluble Asphaltene Layers: Interfacial Rheology versus Interfacial Tension

Effect of Polar Molecule Aggregation on the Stability of Crude Oil/Water Interface: A Molecular Simulation Study

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