Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Aarra, Morten Gunnar; Høiland, Harald; Skauge, Arne

doi:10.1006/jcis.1999.6228

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…It has been shown recently to be quite a complex issue [43]. Moreover, the electrolyte concentration has been found to be slightly different in the microemulsion and excess phases, because of the partitioning of salts [44][45][46], though this is usually neglected for the sake of simplicity. Fortunately, the effect…”

Section: Empirical Correlations To Attain Optimum Formulationmentioning

confidence: 99%

“…, Al ??? are able to precipitate typical anionic surfactants and thus produce effects that cannot be treated simply with an equivalence factor [30,39,42,46]. The effect of the electrolyte anion in sodium salt electrolytes has been studied in detail, and an equivalent salinity has been found to depend on the anion valence [38]; for instance, a sodium phosphate (Na 3 PO 4 ) electrolyte solution is two times less salty than a monovalent NaCl or NaF solution with the same molar concentration.…”

Section: Values For Parameter B Characteristic Accoding To Type Of Smentioning

confidence: 99%

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How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 1. Optimum Formulation for Simple Surfactant–Oil–Water Ternary Systems

Salager

Forgiarini

Bullón

2013

J Surfact & Detergents

188

234

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Enhanced recovery of crude oil by surfactant flooding requires the attainment of an ultralow interfacial tension. Since Winsor's work in the 1950s it has been known that a minimum interfacial tension and a concomitant three‐phase behavior of a surfactant–oil–water system occurs when the interactions of the surfactant and the oil and water phases are exactly equal. It has been known since the 1970s that these conditions are attained when a linear correlation is satisfied between the formulation variables, which are characteristic parameters of the substances as well as the temperature. This first part of our review on how to attain ultralow interfacial tension for enhanced oil recovery shows how formulation scan techniques using these correlations are used to determine an optimum formulation and to characterize unknown surfactants and oils. The physicochemical significance of the original empirical correlation is reported as the surfactant affinity difference or hydrophilic–lipophilic deviation model. We report the range of accurate validity of, and how to test, this simple model with four variables.

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Section: Empirical Correlations To Attain Optimum Formulationmentioning

confidence: 99%

Section: Values For Parameter B Characteristic Accoding To Type Of Smentioning

confidence: 99%

How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 1. Optimum Formulation for Simple Surfactant–Oil–Water Ternary Systems

Salager

Forgiarini

Bullón

2013

J Surfact & Detergents

188

234

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“…The purpose was to ensure that microemulsion Winsor type I (oil in water) was kept when the temperature increased from 50 to 130 °C. Since polar interactions between water molecules and ionic surfactant head groups can be reduced by the aqueous phase salinity, the partition of surfactant to the oil phase can be induced, and a shift of microemulsion from Winsor I to Winsor II could take place. ,− Winsor II, water in oil emulsion, means loss of formulation efficiency due to the increase of both SAIL retention and oil viscosity. − On the other hand, rising temperatures provoke stronger interactions between ionic surfactant head groups and water molecules, making them more hydrophilic as the temperature increases. ,− Figure presents the results of the phase behavior study of the SAIL formulations at 130 °C. The evaluated SAILs behaved highly hydrophilic during the test, showing microemulsion Winsor type I in the tested temperature interval and at the highest evaluated salinity (VB0S).…”

Section: Results and Discussionmentioning

confidence: 99%

Evaluation of Surface-Active Ionic Liquids in Smart Water for Enhanced Oil Recovery in Carbonate Rocks

et al. 2023

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Ionic modification of injected brines (Smart Water EOR) has previously demonstrated great potential for wettability alteration in carbonates from initially mixed-wet toward more water-wet conditions. However, the efficiency of Smart Water application is temperaturedependent, which reduces its ability as a rock wettability modifier at low temperatures (below 100 °C). Moreover, at low temperature conditions, the acid number of crude oils tends to increase in the reservoir, causing a stronger oil wetting character and less water-wet initial conditions. This paper evaluates the wettability alteration potential of surface-active ionic liquids added to Smart Water to obtain a synergistic enhanced oil recovery effect in low-temperature carbonate reservoirs. [C 12 mim]Br, [C 12 Py]Cl, and [C 16 Py]Cl were formulated in Smart Water (SW0Na) and tested as wettability modifiers in mixed-wet carbonate chalk cores. Spontaneous imbibition oil recovery tests showed that the addition of [C 12 mim]Br and [C 12 Py]Cl can cause wettability changes, resulting in increased oil recovery compared to pure SW0Na brine at 90 °C. The highest incremental oil recovery in tertiary mode of 24.6 % OOIP was obtained using [C 12 mim]Br in SW0Na, followed by [C 12 Py]Cl in SW0Na with 22.4 % OOIP, and only 11.5 % OOIP was recovered by pure SW0Na brine. The potential for wettability alteration for carbonate rocks was further evaluated in viscous flooding tests using the best formulation from the results obtained in the spontaneous imbibition experiments ([C 12 mim]Br in SW0Na). The core flooding results showed an ultimate recovery of 79.3 % OOIP achieved in secondary mode injection. Despite the difference in the head groups of the cationic [C 12 mim]Br and [C 12 Py]Cl ionic liquids, both formulations showed abilities to desorb polar organic components of crude oil from the chalk mineral surfaces, thus improving the performance of Smart Water EOR at 90 °C.

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“…While CTAB microemulsions have been extensively studied concerning the addition of ionic salts − and ionic hydrotropes, − there are very few studies on the hydrotropic action of urea on pseudoternary CTAB/ n -alcohol microemulsions. Urea is well-known not only as a protein denaturant , but also as a nonlinear optical material. , Many recent studies − have highlighted the key role of urea as a catalyst, cosurfactant, and surface directing agent in the synthesis of hierarchical or nanostructured porous materials.…”

Section: Introductionmentioning

confidence: 99%

Modulating Interfacial Properties in Pseudoternary Microemulsions via Urea Addition: Impact of Cosurfactant on the Reverse Micellar Structure and Interactions

Majumdar,

Ganguli

2024

Langmuir

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We have studied the structural and interfacial properties of CTAB/isooctane/alcohol/aqueous urea reverse micelles (RMs) for the first time using time-resolved fluorescence and small-angle X-ray scattering techniques. The chain length of alcohol, used as cosurfactant, has been varied to design three microemulsion systems: CTAB/1-butanol, CTAB/1-hexanol, and CTAB/1-octanol/isooctane/water, at a fixed water loading ratio, w 0 = 12. Time-resolved fluorescence anisotropy studies indicate that urea induces micellar aggregation in CTAB/1-butanol and CTAB/1-hexanol RMs but breaks down RM aggregates in CTAB/ 1-octanol RMs. Urea addition slows down solvation dynamics inside RMs at higher urea concentrations, evident from the longer lifetimes of solvent correlation decay. The underlying changes in microemulsion structure and intermicellar interactions are studied using small-angle X-ray scattering studies. The significant intermicellar interactions were modeled using the sticky hard sphere (SHS) for the CTAB/1-butanol and CTAB/1-hexanol RMs and by using the Macroion model for the CTAB/1-octanol RMs. The two different structural factors highlight the dominance of attractive and repulsive forces, respectively. Although there is no change in RM shape, the combination of urea addition and chain length variation in cosurfactants significantly alters the size and interface in these pseudoternary RMs.

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Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Cited by 10 publications

References 20 publications

How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 1. Optimum Formulation for Simple Surfactant–Oil–Water Ternary Systems

How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 1. Optimum Formulation for Simple Surfactant–Oil–Water Ternary Systems

Evaluation of Surface-Active Ionic Liquids in Smart Water for Enhanced Oil Recovery in Carbonate Rocks

Modulating Interfacial Properties in Pseudoternary Microemulsions via Urea Addition: Impact of Cosurfactant on the Reverse Micellar Structure and Interactions

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