Phase segregation, shear thinning and rheological behavior of crude oil-in-water emulsions

Santos, Ronaldo Gonçalves dos; Bannwart, Antonio Carlos; Loh, Watson

doi:10.1016/j.cherd.2013.12.002

Cited by 30 publications

(28 citation statements)

References 18 publications

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“…The presence of n-alcohols lead to more compressible asphaltene films. It has been reported that oil/water interfacial tension [14] and interfacial film elasticity [11] both regulate key emulsion properties such as stability. In this way, the present results could be useful in the design of crude oil-in-water emulsions with appropriate stability, droplet size and viscosity, by way of adding suitable alcohols into the emulsion formulation.…”

Section: Discussionmentioning

confidence: 99%

“…Recent work has demonstrated that emulsions containing conventional ethoxylated surfactants and short-chain alcohols present singular properties [11,14]. The authors have shown the occurrence of phase segregation phenomena and the formation of a fluid layer of low viscosity-known as the oil-depleted layer-during stationary rheological flow.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, the oil flow as o/w emulsions has been described as lubricated flow or slippage. The rheological behavior of the emulsions was described as markedly shear-thinning [14]. Both phase segregation and shear thinning phenomena are supposedly related to the formation of multicomponent interfacial films, which would influence the resistance and the deformability of the dispersed droplet interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Oil-in-water (o/w) emulsions are pointed out as an emergent technology for moving viscous oils. Heavy oil emulsification can lead to the viscosity decreasing enough to allow a feasible pipeline flow [13,14]. Crude oil emulsions are complex systems containing many chemical structures.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Martins

Santos

2018

Colloids and Interfaces

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Abstract:Crude oil asphaltenes contain a wide series of chemical species, which includes the most polar compounds and interfacially active agents from the petroleum. Asphaltenes have been considered to be implicated in foam and emulsion formation during the petroleum recovery and production process. In this work, the interfacial activity of organic solutions containing asphaltene and n-alcohols was investigated. Asphaltene extraction from a 28 • API crude oil produced 2.5 wt % of n-pentane precipitated asphaltene (C5I). Dynamic surface and interfacial tensions of asphaltene solutions were assessed by the pendant drop method. Asphaltene films were evaluated at the air-water interface using a Langmuir trough. Results were expressed by means of the interfacial tension time-dependence. Interfacial tension measurements showed alcohols reduce the toluene/water interfacial tension of asphaltene solutions. The interfacial tension was reduced from 23 mN/m to 15.5 mN/m for a 2 g/L solution of asphaltene plus n-butanol. Higher asphaltene concentrations did not affect the toluene/air surface tension. The effects of n-alcohols on the asphaltene surface activity was dependent on the asphaltene aggregation state. n-Alcohols modify the asphaltene film elasticity and the film phase behavior.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Martins

Santos

2018

Colloids and Interfaces

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“…Santos et al [13] reported the rheological behavior and phase separation of oil-water emulsions. It was demonstrated that the rheological behavior of emulsions is influenced significantly by the alkyl alcohol type co-surfactants.…”

Section: Introductionmentioning

confidence: 99%

Rheological characterization of crude oil-water emulsions

Nagy¹,

Elekes²,

Bartha³

et al. 2016

Epitoanyag - JSBCM

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the polymer-surfactant packages are dissolved in brine and injected into the reservoir in the ceor (chemical enhanced oil recovery) processing, where oil in water type emulsions with different stability are formed. the flow properties of emulsions and their phase separation could be significantly influenced by the flow rate of the fluid phases in the pores of the reservoir rock. the goal of this research was to determine the dynamic viscosity of settled oil-water emulsions. the measurement methods of emulsions were completed with assessment of the phase viscosity characteristics of settled emulsions by using a Brookfield rotational viscometer. Based on the test results it was found that the visually observed phase boundaries were different from that the border determined by the change of dynamic viscosity measured along the liquid column height. the latter method allows a more precise determination of the phase boundary and the ratio of the different phases. keywords: ceor, crude oil-water emulsion, method development, Brookfield viscometer

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Study on rheology and thermal stability of mixed (nonionic–anionic) surfactant based fracturing fluids

2016

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Mixed surfactant systems have gained significant importance in the development of fracturing fluid due to polymorphism of self-assembly structures that have combined properties of the surfactants in the mixture. In this article, a comparative study on the phase behavior and viscoelastic properties of mixed surfactant based fluids, prepared from Tween 801NaOA/2-ethyl hexanol/clove oil/water and Tween 201NaOA/2-ethyl hexanol/clove oil/water quaternary system is investigated in details. The viscoelastic surfactant (VES) based fluids prepared from the former system offered superior rheological properties than the latter system. The addition of 0.1% NaOH and 500 ppm ZnO nano-particles in the VES fluids presented enhanced viscoelastic properties as concluded by static and dynamic rheological tests. Miscibility test indicated the miscibility of the VES fluids with water, unlike in the presence of diesel oil and satisfactory proppant suspension capabilities were exhibited by the developed fluids.Legend: A, water; B, (2-ethyl hexanol1water); C, (0.05% NaOH 1 2-ethyl hexanol 1 water); D, 0.1% NaOH 1 2-ethyl hexanol 1 water.

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Phase segregation, shear thinning and rheological behavior of crude oil-in-water emulsions

Cited by 30 publications

References 18 publications

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Rheological characterization of crude oil-water emulsions

Study on rheology and thermal stability of mixed (nonionic–anionic) surfactant based fracturing fluids

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