Winsor I⇔;III⇔II Microemulsion Phase Behavior of Hydrofluoroethers and Fluorocarbon/Hydrocarbon Catanionic Surfactants

Baran, Jimmie R.

doi:10.1006/jcis.2000.7284

Cited by 12 publications

(8 citation statements)

References 14 publications

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“…22 Also, phase transition lines in a binary phase region can be expressed in an equation by determination of fitting parameters. 23 Phase behavior of microemulsion systems generally encompasses different analyses, which evaluate properties related to oil and water solubilization ratio, optimal salinity, relative phase volume fractions under conditions of varying salinity, brine content, and temperature. The solubilization phenomenon of oil and water in the middlephase microemulsion can be graphically presented as a function of salinity in terms of oil and water solubilization parameter.…”

Section: Introductionmentioning

confidence: 99%

“…Phase transition from a solid–liquid mixture to a two-phase region via a single phase microemulsion can be explained by use of empirical correlations . Also, phase transition lines in a binary phase region can be expressed in an equation by determination of fitting parameters . Phase behavior of microemulsion systems generally encompasses different analyses, which evaluate properties related to oil and water solubilization ratio, optimal salinity, relative phase volume fractions under conditions of varying salinity, brine content, and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Phase Behavior, Solubilization, and Phase Transition of a Microemulsion System Stabilized by a Novel Surfactant Synthesized from Castor Oil

Pal

Saxena

2017

J. Chem. Eng. Data

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Phase behavior, solubilization, and phase transition of a microemulsion system stabilized by a castor oil-based novel surfactant (sodium methyl ester sulfonate) and cosurfactant (propan-2-ol) were investigated for effective application in oil recovery processes. A pseudoternary phase diagram showed the existence of different phases (S/L phase, Winsor I, Winsor II, Winsor III, and Winsor IV) by conventional titration method. With an increase in the cosurfactant-to-surfactant ratio (K cs), the region under the Winsor III phase was found to increase. An increase in cosurfactant content in the system mixture improved interactions of the surfactant with oil and water in the microemulsion phase, thereby reducing molecular aggregations in solution. At optimal salinity, equal amounts of oil and water were solubilized in a microemulsion in the Winsor III systems and showed ultralow interfacial tension (IFT) values on the order of 10–3 to 10–4 mN/m. Phase dilution studies revealed that the microemulsion systems formed were thermodynamically stable. Salinity increased the relative phase volume of a middle-phase microemulsion, whereas an increase in water content reduced the middle phase volume fractions in the Winsor III systems. Phase transition data were analyzed and fitted using empirical relationships. An increase in salinity and brine content caused phase transformation from Winsor I to Winsor II via Winsor III. However, an increase in temperature showed reverse phase transformation from Winsor II to Winsor III.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Behavior, Solubilization, and Phase Transition of a Microemulsion System Stabilized by a Novel Surfactant Synthesized from Castor Oil

Pal

Saxena

2017

J. Chem. Eng. Data

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“…Surfactant-polymer flooding is designed to address those issues. Surfactant-polymer flooding increases oil production by decreasing the mobility ratio of the injected fluid and producing a low interfacial tension flood [2,[8][9][10][11][12]. These effects aid in moving trapped or bypassed oil to the producer, thereby increasing recovery.…”

Section: Introductionmentioning

confidence: 99%

A Systemic Comparison of Physical Models for Simulating Surfactant–Polymer Flooding

Alhotan,

Batista Fernandes,

Delshad

et al. 2023

Energies

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Three different reservoir simulators that utilize both two-phase and three-phase microemulsion phase behavior models are used to model surfactant–polymer flooding to determine and compare their results. Different models are used in each simulator to describe the physical behavior of injected chemicals into the reservoir, which raises the need to benchmark their results. The physical behavior models of polymer and surfactant were constructed and verified on a 1D scale reservoir model and further verified in a 3D model. Finally, simulations were conducted in a field-scale reservoir containing 680,400 grids, where results were compared and analyzed. The 1D and 3D model results suggest an excellent match between the different simulators in modeling surfactant–polymer floods. In the case of the field-scale model, the simulators matched in terms of oil recovery and total volumes produced and injected, while having similar reservoir pressure profiles but with significant discrepancies in terms of injected and produced chemicals. These results indicate that despite the differences in the calculated injected and produced chemicals due to the different models in the simulators, the effect of surfactant–polymer floods on oil recovery, total injected and produced fluids, and average pressure profiles can be comparably modeled in all of the three simulators.

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“…One of the most studied fluorinated reverse microemulsion systems is based on perfluoropolyether (PFPE) species. , Other examples of fluorinated solvents used in forming reverse microemulsions are perfluorinated and partially fluorinated solvents , and hydrofluoroethers (HFEs). ,, However, many fluorinated microemulsion formulations require the use of cosolvents (to improve surfactant solubility) and/or cosurfactants (to modify interfacial properties of surfactant monolayer). Heptafluoro-1-butanol 19 and 1-butanol 20 are among common examples of cosurfactants used to induce fluorinated solvent−continuous microemulsion formation.…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior of CO₂-Expanded Fluorinated Microemulsions

2004

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The formation of CO2-expanded, fluorinated reverse microemulsions is demonstrated for the system of perfluoropolyether (PFPE) surfactant (ClPFPE-NH4, MW = 632) and PFPE oil (PFPE, MW = 580). The phase behavior of this system is examined as a function of temperature (25-45 degrees C), pressure, CO2 concentration, and water to surfactant molar ratios (W0 = 10 and 20). Visual observations of one-phase behavior consistent with reverse microemulsion formation are further supported by spectroscopic measurements that establish the existence of a bulk water environment within the aqueous core. Microemulsion formation is not observed in the absence of CO2 for this PFPE surfactant/PFPE oil system, and a CO2 content greater than 70 mol % is required to induce microemulsion formation. Over the range of water loadings and temperatures investigated, the lowest cloud point pressure is observed at 46 bar (5 wt % ClPFPE-NH4 in PFPE oil, W0 = 20, xCO2 = 0.7, T = 25 degrees C). In the regions where one-phase behavior is observed, the cloud point pressures increase with temperature, water loadings, and CO2 content. The driving forces of microemulsion formation in the CO2-expanded fluorinated solvent are discussed relative to traditional reverse microemulsions and CO2-continuous microemulsions.

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Winsor I⇔;III⇔II Microemulsion Phase Behavior of Hydrofluoroethers and Fluorocarbon/Hydrocarbon Catanionic Surfactants

Cited by 12 publications

References 14 publications

Phase Behavior, Solubilization, and Phase Transition of a Microemulsion System Stabilized by a Novel Surfactant Synthesized from Castor Oil

Phase Behavior, Solubilization, and Phase Transition of a Microemulsion System Stabilized by a Novel Surfactant Synthesized from Castor Oil

A Systemic Comparison of Physical Models for Simulating Surfactant–Polymer Flooding

Phase Behavior of CO₂-Expanded Fluorinated Microemulsions

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Winsor I⇔;III⇔II Microemulsion Phase Behavior of Hydrofluoroethers and Fluorocarbon/Hydrocarbon Catanionic Surfactants

Cited by 12 publications

References 14 publications

Phase Behavior, Solubilization, and Phase Transition of a Microemulsion System Stabilized by a Novel Surfactant Synthesized from Castor Oil

Phase Behavior, Solubilization, and Phase Transition of a Microemulsion System Stabilized by a Novel Surfactant Synthesized from Castor Oil

A Systemic Comparison of Physical Models for Simulating Surfactant–Polymer Flooding

Phase Behavior of CO2-Expanded Fluorinated Microemulsions

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Product

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Phase Behavior of CO₂-Expanded Fluorinated Microemulsions