Asphaltene Subfractions Responsible for Stabilizing Water-in-Crude Oil Emulsions. Part 1: Interfacial Behaviors

Yang, Fan; Tchoukov, Plamen; Pensini, Erica; Dąbroś, Tadeusz; Czarnecki, Jan; Masliyah, Jacob H.; Xu, Zhenghe

doi:10.1021/ef501826g

Cited by 154 publications

(231 citation statements)

References 36 publications

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“…It was reported that rather than whole asphaltenes, only a subfraction of asphaltenes is more likely the real contributor to the stabilization of W/O emulsions. 26,[80][81][82][83][84][85][86] The asphaltenes adsorbed onto clays have also been found to be different in composition from whole asphaltenes. 70,[75][76][77] Therefore, it is important to find ways to extract and study these particular species from asphaltenes, which are mainly responsible for the relevant issues of interest.…”

Section: Extended-sara (E-sara)mentioning

confidence: 99%

“…85 The entire fractionation procedure is schematically represented in Figure 4. Pentaneextracted asphaltenes from Athabasca coker feed bitumen (Syncrude Canada, Ltd., Canada) were referred to as whole asphaltenes (WA) in this work.…”

Section: Fractionation Of Asphaltenes Based On Asphaltene Adsorption mentioning

confidence: 99%

“…85 In addition, using thin liquid film technique, which was proven to be a useful tool for understanding the stabilization mechanisms of W/O emulsions, Yang et al…”

Section: Emulsion Stability and Oil Film Propertiesmentioning

confidence: 99%

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Fractionation of Asphaltenes in Understanding Their Role in Petroleum Emulsion Stability and Fouling

et al. 2017

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SARA fractionation separates the oil into fractions of saturates (S), aromatics (A), resins (R), and asphaltenes (A) based on the differences in their polarizability and polarity.Defined as a solubility class, asphaltenes are normally considered as a menace in the petroleum industry mainly due to their problematic precipitation and adsorption at oil water and oil-solid interfaces. As a broad range of molecules fall within the group of asphaltenes with distinct sizes and structures, considering the asphaltenes as a whole was noted to limit the deep understanding of governing mechanisms in asphaltene-induced problems.Extended-SARA (E-SARA) is being proposed as a concept of asphaltene fractionation according to their interfacial activities and adsorption characteristics, providing critical information to correlate specific functional groups with certain characteristics of asphaltene aggregation, precipitation and adsorption. Such knowledge obtained is essential to addressing asphaltene-related problems by targeting specific subfractions of asphaltenes for selective removal.2

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Section: Extended-sara (E-sara)mentioning

confidence: 99%

Section: Fractionation Of Asphaltenes Based On Asphaltene Adsorption mentioning

confidence: 99%

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Fractionation of Asphaltenes in Understanding Their Role in Petroleum Emulsion Stability and Fouling

et al. 2017

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“…39 Several recent studies highlighted chemical and structural differences between asphaltenes that strongly adsorb at the oil-water and oil-solid interfaces and those remaining in the bulk oil. 40,41,42 An extended SARA analysis 33 where asphaltenes are fractionated and characterized according to their adsorption affinity confirmed differences between adsorbed asphaltenes and whole asphaltenes. In particular, asphaltenes strongly partitioned at the oil-water interface contain a particularly high oxygen content, which led to the increased presence of sulfoxide groups.…”

Section: Introductionmentioning

confidence: 85%

Molecular Interactions between a Biodegradable Demulsifier and Asphaltenes in an Organic Solvent

et al. 2016

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A surface forces apparatus (SFA) was used to measure the intermolecular forces between a biodegradable demulsifier (ethyl cellulose, EC) and asphaltenes immobilized on two molecularly smooth mica surfaces in an organic solvent. A steric repulsion on approach between the immobilized EC layers and asphaltenes was measured, despite strong adhesion during retraction. The measured adhesion was attributed to the interpenetration and tangling of aliphatic branches of swollen asphaltenes and solvated chains of EC macromolecules. Competitive adsorption of EC on/in immobilized asphaltene layers was confirmed by combining SFA force measurements and atomic force microscopy (AFM) imaging. Following the injection of EC-in-toluene solution, an immediate (< 5 min) increase in the confined layer thickness of the immobilized asphaltenes layers was measured. Irreversibly adsorbed asphaltenes were displaced by EC macromolecules through binding with unoccupied surface sites on mica, followed by the spreading of EC across the mica substrate due to increased surface activity governed by the higher number of hydroxyl groups per EC molecule. AFM imaging confirmed that the increase in confined layer thickness resulted from the formation of larger asphaltene aggregates/clusters protruding from the mica substrate.Molecular level topographical images showed that the asphaltenes were not re-solvated in the -2 -organic phase but more self-associated as the EC macromolecules spread across the hydrophilic mica substrate. The results from this study provide not only fundamental insights into the basic interaction mechanisms of asphaltenes and EC macromolecules as a demulsifier in organic media, but also directions towards enhancing demulsification of water-in-oil emulsions.

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“…They are also important factors affecting the swept volume and displacement efficiency. The emulsion behaviors include different characteristics such as Newtonian fluid, expansion fluid, pseudoplastic fluid, and viscoelastic fluid . The interfacial rheological method is the most common method for measuring the rheological properties of emulsions.…”

Section: Rheological Property and Stability Of Emulsionsmentioning

confidence: 99%

A comprehensive review of emulsion and its field application for enhanced oil recovery

Yazhou

Yin

Chen

et al. 2019

Energy Science & Engineering

104

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Emulsification plays an important role in enhancing oil recovery. Experiments and field applications of alkali/surfactant/polymer (ASP) flooding indicated that the amount of oil recovery in liquids with emulsions is 5% higher than that in liquids with no emulsions. Therefore, it is of great significance to study emulsion and its field application for enhanced oil recovery. This paper discusses the current status of emulsion for enhanced oil recovery, including the formation mechanism of emulsions in chemical flooding, rheological properties, stability, seepage characteristics, emulsion improving sweep volume, and displacement efficiency, along with future development plans of emulsion for enhanced oil recovery, especially surfactants for chemical flooding. In addition, the Pickering emulsion for application in enhanced oil recovery is also discussed. The development effects of emulsion flooding have been discussed for the Midway‐Sunset Oilfield, the emulsification characteristics of ASP flooding have been analyzed in Xing‐V and Xing‐II of the Daqing Oilfield, and the experiences regarding emulsion for enhanced oil recovery have been summarized. The key research directions of emulsion for enhanced oil recovery are indicated.

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Asphaltene Subfractions Responsible for Stabilizing Water-in-Crude Oil Emulsions. Part 1: Interfacial Behaviors

Cited by 154 publications

References 36 publications

Fractionation of Asphaltenes in Understanding Their Role in Petroleum Emulsion Stability and Fouling

Fractionation of Asphaltenes in Understanding Their Role in Petroleum Emulsion Stability and Fouling

Molecular Interactions between a Biodegradable Demulsifier and Asphaltenes in an Organic Solvent

A comprehensive review of emulsion and its field application for enhanced oil recovery

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