AC field induced destabilization of water-in-oil emulsions based on North Sea acidic crude oil

Rodionova, G. N.; Keleşoğlu, Serkan; Sjöblom, Johan

doi:10.1016/j.colsurfa.2014.01.019

Cited by 31 publications

(24 citation statements)

References 12 publications

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“…It has been observed that elevating temperature, strength (voltage), duration, or frequency of the imposed electric field led to noticeably enhanced dehydration performance of model W/O emulsion [19,216,[219][220][221]. However, demulsification productivity of such emulsion substantially changed with different waveforms in declining order of square, sinusoidal and triangular [219].…”

Section: Influential Featuresmentioning

confidence: 94%

“…The droplets may even not have adequate time to respond to rapid variations in alternating current at too high frequencies, giving rise to formation of shorter chains of drops [225]. Crude oil emulsions are far more rapidly (and perhaps irreversibly) flocculated when subjected to certain electric field voltage owing to greater number of droplets and hence lower distance between them, leading to reduction in emulsion viscosity [19,226]. That is why low concentrated emulsions typically undergo laminar or turbulent flow by internal mixing to initially aid in approaching of droplets and forming chains [19].…”

Section: Influential Featuresmentioning

confidence: 98%

“…In contrast to large voltages, large frequencies do not usually influence on increment in droplets distortion and emulsion resolution [19]. The droplets may even not have adequate time to respond to rapid variations in alternating current at too high frequencies, giving rise to formation of shorter chains of drops [225].…”

Section: Influential Featuresmentioning

confidence: 99%

“…In this respect, non-homogenized emulsions containing bigger droplet size require much lower optimal frequency to be demulsified in comparison with homogenized emulsions having small, narrowly distributed dispersed droplets [224]. The frequency magnitude may prominently depend on the electric field strength; the choice of optimum frequency is particularly essential at low voltages [19].…”

Section: Influential Featuresmentioning

confidence: 99%

“…Density, viscosity, chemical composition, and water content of crude oil, and hence the extent of its stability may vary remarkably from field to field and even within the same production well at different times [19,20].…”

Section: Water-in-oil (W/o) Emulsionsmentioning

confidence: 99%

See 4 more Smart Citations

Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry

Zolfaghari

Fakhru’l‐Razi

Abdullah

et al. 2016

Separation and Purification Technology

505

255

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The difficulties associated with transportation and refining of crude oil emulsions as well as produced water discharge limitations are among the conspicuous clues that have led the oilfield researchers to probe into practical demulsification methods for many decades.Inconsistent research outcomes observed in the literature for a particular demulsification method of a typical emulsion (i.e., water-in-oil or oil-in-water) arise not only from the varied influential parameters associated (such as salinity, temperature, pH, dispersed phase content, emulsifier/demulsifier concentration, droplet size, etc.), but also from the diverse types of emulsion constituents (namely oil, surfactant, salt, alkali, polymer, fine solids, and/or other chemicals/impurities). Being the main component in formation of stabilizing interfacial film surrounding the dispersed phase droplets, surfactant is the most predominant contributor to emulsion stability, extent of which depends on its nature (being ionic or nonionic, and its degree of hydrophilicity/lipophilicity), concentration and interaction with other surface-active agents in the emulsion, as well as on the salinity, temperature, and pH of the system. In this paper, it is endeavored to overview some of the most commonly exploited demulsification techniques (i.e., chemical, biological, membrane, electrical, and microwave irradiation) on both the oilfield and synthetic emulsions, taking into account the emulsion-stabilizing anddestabilizing effects with regard to the dominant parameters plus the emulsion composition.Further, the variations occurring in interfacial properties of emulsions by demulsification process are discussed. Finally, the mechanism(s) involved in emulsions resolution achieved by each method is elucidated. Clearly, the most efficient demulsification approach is the one able to attain desirable separation efficiency while complying with the environmental regulations and imposing the least economic burden on the petroleum industry.

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Section: Influential Featuresmentioning

confidence: 94%

Section: Influential Featuresmentioning

confidence: 98%

Section: Influential Featuresmentioning

confidence: 99%

Section: Influential Featuresmentioning

confidence: 99%

Section: Water-in-oil (W/o) Emulsionsmentioning

confidence: 99%

See 3 more Smart Citations

Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry

Zolfaghari

Fakhru’l‐Razi

Abdullah

et al. 2016

Separation and Purification Technology

505

255

View full text Add to dashboard Cite

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Scaling analysis of droplet forces in electrocoalescence: effect of frequency and waveform on dehydration efficiency

de F. Esteves,

Castor,

Pinto

et al. 2023

Braz. J. Chem. Eng.

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Millisecond-scale electric fields and minute-to-hour sedimentation times complicate the direct simulation of electrocoalescence. A scale analysis of the electrocoalescence process was performed, leading to the conclusion that the dielectrophoretic (DEP) force is the primary force involved. Since the dielectrophoretic force does not change direction during electrocoalescence and the electric field timescale is much smaller than droplet sedimentation, an average DEP force is proposed for analyzing the electrocoalescence process.This uncouples the dynamics of the electric field and sedimentation, simplifying the understanding of the process.As the DEP force drives droplets toward the electrodes, droplet-to-electrode coalescence becomes an important mechanism. The frequency effect on electrocoalescence was examined in light of droplet oscillation. A non-dimensional number, similar to the Deborah number, was defined for the electrocoalescence process. It was demonstrated that high frequencies enhance electrocoalescence by protecting large droplets from breaking. The theoretical derivations were successfully applied to interpret batch electrocoalescence data under various waveforms, voltages, and frequencies.

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Emulsion separation

Krebs¹,

Akdim²

2023

Surface Process, Transportation, and Storage

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AC field induced destabilization of water-in-oil emulsions based on North Sea acidic crude oil

Cited by 31 publications

References 12 publications

Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry

Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry

Scaling analysis of droplet forces in electrocoalescence: effect of frequency and waveform on dehydration efficiency

Emulsion separation

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