Thermodynamic, Interfacial and Structural Properties of Alcohol - Brine - Hydrocarbon Systems

Bellocq, A. M.; Bourbon, Dominique; Lemanceau, Bernard

doi:10.1080/01932698108943898

Cited by 24 publications

(8 citation statements)

References 11 publications

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“…Independently of the different and more or less elaborated aspects [113,139,187,245,246], they all represent the same, i.e., the evolution of the SOW ternary diagram along the three typical diagram sequences proposed by Winsor [2] as the formulation is changed. In the range of the considered formulation variables in which a three-phase behavior occurs, the WIII body is generated by a changing triangle with vertices representing the microemulsion middle phase and excess phases [247][248][249][250].…”

Section: Combination Of Three Single Effects Produced By Three Variabmentioning

confidence: 99%

How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 4: Robustness of the Optimum Formulation Zone Through the Insensibility to Some Variables and the Occurrence of Complex Artifacts

Salager

Antón

Arandia

et al. 2017

J Surfact & Detergents

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In enhanced oil recovery, not only the low‐tension performance, but also the robustness at optimum formulation is an important issue. The fourth part of our review series is dedicated to robustness, defined as the width of the zone exhibiting three‐phase behavior around the optimum formulation, whatever the scanned variable. It is first corroborated from a screening of the available data in the literature that the tension minimum is inversely proportional to the square of the three‐phase range in the HLD scale. However, since there is still an inaccuracy of about a factor 10 in the tension minimum, some significant improvement can be attained in some cases by increasing the three‐phase behavior width in two ways. The first approach consists of finding systems that are insensitive to some formulation variable such as temperature, surfactant mixture composition or concentration, and water‐to‐oil ratio. The second way is to produce an artifact through which the optimum formulation is produced twice in a scan. If the distance between the two events in the scan is reduced down to be zero, their corresponding three‐phase behavior zones merge and result in a wider WIII region with a low tension. Several cases of such events are reported: alkaline scans, anionic‐nonionic and anionic‐cationic mixture changes, linear change in composition in three‐surfactant mixture, partial precipitation from a surfactant mixture in a salinity scan, and excessive partitioning of polyethoxylated nonionics. More complex transitions with three effects in a single scan or three concomitantly scanned variables show even more possibilities in practice.

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Section: Combination Of Three Single Effects Produced By Three Variabmentioning

confidence: 99%

How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 4: Robustness of the Optimum Formulation Zone Through the Insensibility to Some Variables and the Occurrence of Complex Artifacts

Salager

Antón

Arandia

et al. 2017

J Surfact & Detergents

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“…More hydrophilic ones have a very small effect, while more lipophilic ones like n-pentanol or n-hexanol contribute to the hydrophilicity-lipophilicity balance at interface and result in a formulation effect included as the term called f(A) or /(A) in the SAD/HLD equations discussed in Part 1 of this review [1] or equivalent way to take into account the alcohol effect [28,33,37,39,55,[137][138][139][140][141][142]]. This f(A)//(A) term is easy to measure, but it has not been reported with accuracy in the literature for two reasons.…”

Section: Alcohol Effects As Cosurfactantsmentioning

confidence: 99%

How to Attain an Ultralow Interfacial Tension and a Three‐Phase Behavior with a Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 2. Performance Improvement Trends from Winsor's Premise to Currently Proposed Inter‐ and Intra‐Molecular Mixtures

Salager

Forgiarini

Márquez

et al. 2013

J Surfact & Detergents

135

132

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The minimum interfacial tension occurrence along a formulation scan at the so-called optimum formulation is discussed to be related to the interfacial curvature. The attained minimum tension is inversely proportional to the domain size of the bicontinuous microemulsion and to the interfacial layer rigidity, but no accurate prediction is available. The data from a very simple ternary system made of pure products accurately follows the correlation for optimum formulation, and exhibit a linear relationship between the performance index as the logarithm of the minimum tension at optimum, and the formulation variables. This relation is probably too simple when the number of variables is increased as in practical cases. The review of published data for more realistic systems proposed for enhanced oil recovery over the past 30 years indicates a general guidelines following Winsor’s basic studies concerning the surfactant–oil–water interfacial interactions. It is well known that the major performance benefits are achieved by blending amphiphilic species at the interface as intermolecular or intramolecular mixtures, sometimes in extremely complex formulations. The complexity is such that a good knowledge of the possible trends and an experienced practical know-how to avoid trial and error are important for the practitioner in enhanced oil recovery.

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“…The three-phase body is located between two critical endpoints at which two phases become identical in the presence of the third phase. − Due to the critical phenomenon, ultralow interfacial tensions should be attained between each phase in the three-phase body. − In an ordinary water/nonionic surfactant/oil system, the two critical endpoints are fixed at a constant pressure according to the phase rule. However, if the number of components is increased, it is possible that the two critical endpoints approach each other, and eventually the system reaches the tricritical point, which is defined as a point at which three conjugate phases become identical simultaneously. ,− The tricritical point can be regarded as the birthplace of the middle-phase microemulsion.…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior of Cationic Microemulsions near the Tricritical Point

et al. 1999

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The three-phase behavior of a microemulsion was investigated near the tricritical point in a NaBr/ water/hexadecyl-trimethylammonium bromide (CTAB)/butanol/decane system at 25°C. The three-phase body, consisting of water-rich, microemulsion (surfactant), and oil-rich phases, exists between two critical endpoints where the water (or oil) phase becomes identical with the microemulsion phase. It is found in the phase diagram that the three-phase body shrinks with the change of NaBr concentration in water, and eventually disappears at the optimum concentration 0.5 wt % of NaBr. Not only the salinity but also the butanol/decane ratio effects the reduction of the three-phase body. This system was characterized by means of density, interfacial tension, and static light scattering measurements. The change of the density values of two phases near the tricritical point where the three-phase body is not observed, apparently showed that the oil droplets disperse in water (O/W type) in the lower phase, while in the upper phase the water droplets disperse in oil (W/O type). Under a fixed decane/butanol ratio, the tricritical point tends to be reached with increasing CTAB concentration. As the tricritical point was approached, at which two phases look bluish, the light scattering experiment showed that the microemulsion droplets in the upper and the lower phases increased in size and their sizes become of the same order. At the tricritical point, the microemulsions with the maximum solubilization of water or oil merge with each other due to efficient droplet size and strengthened interaction between the particles. Consequently, the bicontinuous structure was formed.

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Thermodynamic, Interfacial and Structural Properties of Alcohol - Brine - Hydrocarbon Systems

Cited by 24 publications

References 11 publications

How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 4: Robustness of the Optimum Formulation Zone Through the Insensibility to Some Variables and the Occurrence of Complex Artifacts

How to Attain Ultralow Interfacial Tension and Three‐Phase Behavior with Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 4: Robustness of the Optimum Formulation Zone Through the Insensibility to Some Variables and the Occurrence of Complex Artifacts

How to Attain an Ultralow Interfacial Tension and a Three‐Phase Behavior with a Surfactant Formulation for Enhanced Oil Recovery: A Review. Part 2. Performance Improvement Trends from Winsor's Premise to Currently Proposed Inter‐ and Intra‐Molecular Mixtures

Phase Behavior of Cationic Microemulsions near the Tricritical Point

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