Rheology of Water-in-Crude Oil Emulsions: Influence of Concentration and Temperature

Kolotova, Daria S.; Kuchina, Yuliya A.; Petrova, Lyudmila; Voron’ko, Nicolay G.; Derkach, Svetlana R.

doi:10.3390/colloids2040064

Cited by 38 publications

(24 citation statements)

References 39 publications

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“…The viscosity of the emulsions was relatively higher than that of the base oil PAO, especially for the emulsion containing high water concentration. This is consistent with the observation of Kolotova et al (2018). With the increase of water fraction, more inter-drop interactions lead Figure 1 Schematic of the setup using interferometry measurement to an increase in friction, which causes the growth of viscosity and non-Newtonian behaviour (Kolotova et al, 2018).…”

Section: Preparation Of Emulsionssupporting

confidence: 85%

“…This is consistent with the observation of Kolotova et al (2018). With the increase of water fraction, more inter-drop interactions lead Figure 1 Schematic of the setup using interferometry measurement to an increase in friction, which causes the growth of viscosity and non-Newtonian behaviour (Kolotova et al, 2018). Unlike pure oils, the viscosity of the emulsions was not constant and slightly changed with time.…”

Section: Preparation Of Emulsionssupporting

confidence: 83%

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Effects of cleaning detergent/water-in-oil emulsions on elastohydrodynamic lubrication

et al. 2021

ILT

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Purpose The cleaning of food production equipment using cleaning detergents may contaminate the lubricant of the bearings, thereby reducing the bearing service life. The purpose of this paper is to investigate the cause and mechanism of such damage of bearings lubricated by cleaning detergent/water-in-oil emulsions. Design/methodology/approach The emulsion was prepared by adding a mixture of cleaning detergent and water in one base oil. A self-designed ball-on-disc optical interference test rig was applied to examine the effect of emulsion on lubrication and wear of bearing contacts under pure sliding conditions. Findings The emulsion reduced lubricating film thickness at a relatively low-sliding speed but only when the water concentration (20%) in emulsion was high. Water droplets were trapped around the ball-on-disc contact area under static conditions because of a high capillary force. The emulsion can induce damages on the soft surface in the startup mainly due to the presence of water around the contact. Originality/value The basic lubrication behaviour of water/oil emulsions containing cleaning detergent under pure sliding was experimental studied and the mechanism of bearing damage in food production equipment was investigated. Based on the study, the solution to avoid such damage was proposed.

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Section: Preparation Of Emulsionssupporting

confidence: 85%

Section: Preparation Of Emulsionssupporting

confidence: 83%

Effects of cleaning detergent/water-in-oil emulsions on elastohydrodynamic lubrication

et al. 2021

ILT

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“…This behavior promotes the coalescence of water droplets leading to the change of the emulsion’s properties. This phenomenon can be observed by a decrease in viscosity at the macroscale as observed by Kolotova et al 38 and a reduction of G ′ at the microscale as exhibited in Figure 8a and other references. 14,15,21…”

Section: Resultssupporting

confidence: 58%

Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

Liu

et al. 2019

ACS Omega

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In order to break the aging crude oil (WACO) emulsion of the offshore platform more effectively, a highly active isocyanate, polyaryl polymethylene isocyanate (PAPI), was selected to modify the pilot-scale tannic acid demulsifier. In the addition of PAPI, its molecular weight and viscosity dramatically increased, while its relative solubility, hydroxyl number, and cloud point exhibited an opposite direction, showing an increase in hydrophobicity. After adding the above modified demulsifier, a remarkably improved water removal of WACO emulsion accompanied by a notable reduction of the water content in the oil phase monitored by the Karl Fischer method was observed. Demulsification on the offshore platform demonstrated that the best water removal was achieved when the proportion of PAPI is 1.5 wt %. Its demulsification efficiency reached 95.7%, which was 25.6% higher than the 76.2% of unmodified demulsifier. In addition, a positive correlation between viscoelasticity of emulsion and demulsification performance was found by only adjusting the parameters of the rheometer. This method may be utilized to characterize the demulsification performance by any rotary rheometer. The pilot-scale demulsification experiment demonstrated that the water removal can reach 98.14 vol % and residual water content was only 0.55 vol %. These results further confirmed the excellent demulsification performance of the modified demulsifier toward the WACO emulsion in production.

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“…This behavior eventually evolves into the formation of a dispersed phase. Such dispersed particles distort the flow pattern which manifests in higher viscosity, and finally, the fluid exhibits a non-Newtonian behavior (at low temperatures) [23,24]. If experimental data demonstrate that a surfactant molecule reduces viscosity, then it can be employed as a flow enhancer in extraction and transport processes in the crude oil industry.…”

Section: Results: Theoretical Predictionsmentioning

confidence: 99%

Water-In-Oil Emulsions through Porous Media and the Effect of Surfactants: Theoretical Approaches

et al. 2019

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The most complex components in heavy crude oils tend to form aggregates that constitute the dispersed phase in these fluids, showing the high viscosity values that characterize them. Water-in-oil (W/O) emulsions are affected by the presence and concentration of this phase in crude oil. In this paper, a theoretical study based on computational chemistry was carried out to determine the molecular interaction energies between paraffin-asphaltenes-water and four surfactant molecules to predict their effect in W/O emulsions and the theoretical influence on the pressure drop behavior for fluids that move through porous media. The mathematical model determined a typical behavior of the fluid when the parameters of the system are changed (pore size, particle size, dispersed phase fraction in the fluid, and stratified fluid) and the viscosity model determined that two of the surfactant molecules are suitable for applications in the destabilization of W/O emulsions. Therefore, an experimental study must be set to determine the feasibility of the methodology and mathematical model displayed in this work.

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Rheology of Water-in-Crude Oil Emulsions: Influence of Concentration and Temperature

Cited by 38 publications

References 39 publications

Effects of cleaning detergent/water-in-oil emulsions on elastohydrodynamic lubrication

Effects of cleaning detergent/water-in-oil emulsions on elastohydrodynamic lubrication

Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

Water-In-Oil Emulsions through Porous Media and the Effect of Surfactants: Theoretical Approaches

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