Structure of waxy crude oil emulsion gels

Visintin, Ruben F. G.; Lockhart, Thomas P.; Lapasin, Romano; D’Antona, Paolo

doi:10.1016/j.jnnfm.2007.07.008

Cited by 121 publications

(97 citation statements)

References 14 publications

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“…Deo, 2002; Leon et al, 2000;Visintin et al, 2008). The factors influencing asphaltene and paraffin aggregation are ruled by the equilibrium disturbance of crude oil's original composition, presence of trapped water in the reservoir (also called formation water), temperature diminution that favors aggregation as well as their chemical modification in the reservoir (Table 2).…”

Section: Deposition Of Asphaltenes and Paraffinsmentioning

confidence: 99%

Current Knowledge and Potential Applications of Ionic Liquids in the Petroleum Industry

José-Alberto¹,

Jorge²

2011

Ionic Liquids: Applications and Perspectives

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Section: Deposition Of Asphaltenes and Paraffinsmentioning

confidence: 99%

Current Knowledge and Potential Applications of Ionic Liquids in the Petroleum Industry

José-Alberto¹,

Jorge²

2011

Ionic Liquids: Applications and Perspectives

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“…Emulsions are ubiquitous in crude oil production, and they can be classified into three broad groups: water-in-oil (W/O) emulsions, oil-in-water (O/W) emulsions, and multiple or complex emulsions [1,2]. In oil production wells, the O/W emulsion and multiple emulsion may be encountered more frequently when the water cut reaches a high value.…”

Section: Introductionmentioning

confidence: 99%

The Role of Shearing Energy and Interfacial Gibbs Free Energy in the Emulsification Mechanism of Waxy Crude Oil

Wang

Lin

Rui³

et al. 2017

Energies

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Abstract:Crude oil is generally produced with water, and the water cut produced by oil wells is increasingly common over their lifetime, so it is inevitable to create emulsions during oil production. However, the formation of emulsions presents a costly problem in surface process particularly, both in terms of transportation energy consumption and separation efficiency. To deal with the production and operational problems which are related to crude oil emulsions, especially to ensure the separation and transportation of crude oil-water systems, it is necessary to better understand the emulsification mechanism of crude oil under different conditions from the aspects of bulk and interfacial properties. The concept of shearing energy was introduced in this study to reveal the driving force for emulsification. The relationship between shearing stress in the flow field and interfacial tension (IFT) was established, and the correlation between shearing energy and interfacial Gibbs free energy was developed. The potential of the developed correlation model was validated using the experimental and field data on emulsification behavior. It was also shown how droplet deformation could be predicted from a random deformation degree and orientation angle. The results indicated that shearing energy as the energy produced by shearing stress working in the flow field is the driving force activating the emulsification behavior. The deformation degree and orientation angle of dispersed phase droplet are associated with the interfacial properties, rheological properties and the experienced turbulence degree. The correlation between shearing stress and IFT can be quantified if droplet deformation degree vs. droplet orientation angle data is available. When the water cut is close to the inversion point of waxy crude oil emulsion, the interfacial Gibbs free energy change decreased and the shearing energy increased. This feature is also presented in the special regions where the suddenly changed flow field can be formed. Hence, the shearing energy is an effective form that can show the contribution of kinetic energy for the oil-water mixtures to interfacial Gibbs free energy in emulsification process, and the emulsification mechanism of waxy crude oil-water emulsions was further explained from the theoretical level.

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“…H. Ronningsen [4], for his part, recalls an earlier model in which the gelled crude oil is compared to polymer gels, and it is yielding behavior being linked to the "…rupture of bond linkages within the crystal network…". According to R. Visintin et al [5] there is a body of data that supports that this gelation process results from the creation of "… a network of wax crystals that present a strong affinity…". Furthermore, "…the fast flocculation of wax crystallites, as soon as they have been formed in solution…", is also invoked by E. Vignatti et al [6] to explain this gelation process.…”

Section: Introductionmentioning

confidence: 99%

On the Influence of Micro- and Macro-Cristalline Paraffins on the Physical and Rheological Properties of Crude Oil and Organic Solvents

Oliveira¹,

Vieira²,

Miranda³

et al. 2016

ChChT

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Structure of waxy crude oil emulsion gels

Cited by 121 publications

References 14 publications

Current Knowledge and Potential Applications of Ionic Liquids in the Petroleum Industry

Current Knowledge and Potential Applications of Ionic Liquids in the Petroleum Industry

The Role of Shearing Energy and Interfacial Gibbs Free Energy in the Emulsification Mechanism of Waxy Crude Oil

On the Influence of Micro- and Macro-Cristalline Paraffins on the Physical and Rheological Properties of Crude Oil and Organic Solvents

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