Theoretical Behaviour of Microemulsions Geometrical Aspects, Dilution Properties and Role of ALCOHOL.COMPARISON With Experimental Results.

Biais, J.; Bothorel, P.; Clin, B.; Lalanne, P.

doi:10.1080/01932698108943900

Cited by 80 publications

(13 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Formulation C = n C 16–18 -PO 7 -EO 0,1 -SO 4 Na 0.25% + i C 10 EO 10 0.5% shows the expected Winsor I–Winsor III–Winsor II transition over the salinity gradient using NaCl only (Figure ) and also when using a mix of seawater (SW) and formation brine (FW) containing divalent cations (see pipettes in SI, Figure C). Replacing NaCl by a mix of SW and FW diminishes slightly S* at WOR 3 (see Table ), which would indicate a slight impact of divalent cations on the synthetic surfactants’ hydrophilicity. , The corresponding activity map is shown in Figure . Compared to Formulation A, quasi no variation of the optimal salinity is observed depending on the WOR.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Insights into the Intimate Link between the Surfactant/Oil/Water Phase Behavior and the Successful Design of (Alkali)–Surfactant–Polymer Floods

et al. 2021

View full text Add to dashboard Cite

Formulating alkali-surfactant-polymer (ASP) solutions for chemical enhanced oil recovery (EOR) requires detailed phase behavior investigation, especially with some “difficult” crude oils of medium acidity, for which special attention must be paid to the surfactants and alkali selection. In this work, the efficiencies of eight corefloods performed on a real case study in (A)SP conditions have been related to the phase behavior of the surfactant/crude oil/water (SOW) systems investigated as a function of salinity, water-to-oil ratio (WOR), surfactant concentration, and alkali type. We show that the variation of the extent of the ultralow interfacial tension domain with WOR must be considered when designing the salinity gradient, especially when alkali is used. The precise salinity of the (A)SP slug is not a key parameter as far as the salinity of the water in place corresponds to type II systems and the salinity of the subsequent P slug corresponds to type I systems. The effect of the consumption of alkali during propagation in the coreflood is particularly sensitive for sodium carbonate, as compared to ammonia; therefore, this latter alkali should be preferred. Finally, the development of alkali-free surfactant formulations appears to be the most robust alternative and proved to be efficient on both sandstone and limestone, with a limited adsorption. The findings of this study are of practical interest for deploying chemical EOR on the field, particularly to overcome issues of salinity source availability.

show abstract

Section: Resultsmentioning

confidence: 99%

“…In practice, one has to deal with complex oils (crude oil for example), mixtures of commercial surfactants, and mixtures of salts. Each of these compounds is then considered as one pseudocomponent for simplification, even if this assumption is not always pertinent …”

Section: Introductionmentioning

confidence: 99%

Insights into the Intimate Link between the Surfactant/Oil/Water Phase Behavior and the Successful Design of (Alkali)–Surfactant–Polymer Floods

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In order to obtain complementary information on the state of the xylene, measurements of the xylene vapour pressure were performed (Figures 7, 8). Such data can be used to evaluate a thermodynamical aggregation model such as the pseudophase model for microemulsions [23,24]. In an ionic microemulsion, containing surfactant, alcohol, water and hydrocarbon, the pseudophases are the hydrophobic domains, the hydrophilic domains and the interfacial region.…”

Section: Discussionmentioning

confidence: 99%

An NMR self-diffusion investigation of water/xylene/alkyl amine solutions

Wärnheim

1986

Colloid & Polymer Sci

View full text Add to dashboard Cite

Extensions of the solution phases have been determined and the self-diffusion behaviour investigated in ternary systems containing water/xylene/primary alkyl amine, where the chain length of the amine varied between C6 and C_q 0. The phase diagrams at 25~ are dominated by a solution phase and a rather large water/xylene miscibility gap which increases slightly in size with increasing chain length of the amine. A lamellar liquid crystalline phase was found in all binary amine/water systems at 25 ~ except for hexylamine where the lamellar phase melts below this temperature. The self-diffusion coefficients of all components decrease in a similar way when water is added to a xylene/amine solution. The self-diffusion is rapid and of similar magnitude for all components, which shows that no well-defined inverse aggregates are formed. The data are discussed in terms of hydrogen bonding between the different species in the solution.

show abstract

“…The points are the data, while the line is the linear leastsquares fit to the line. The equation of the line is: log CMC = -0.970 log (total ionics) + 0.024 (2) for 398 0 F (473 K) show a break at 0.23%. (See Table 2 for a complete listing of CMC's.)…”

Section: Pure Surfactantsmentioning

confidence: 99%

The Effect of Temperature, Salinity, and Alcohol on the Critical Micelle Concentration of Surfactants

Noll¹

1991

Proceedings of SPE International Symposium on Oilfield Chemistry

View full text Add to dashboard Cite

INTRODUCTION ABSTRACTSurfactants are used at high temperatures as additives for steamfloods, and in high-temperature surfactant floods. Most surfactants must be above the critical micelle concentration (CMC) in order to have appropriate properties for forming foams or mobilizing oil. The CMC of a surfactant increases dramatically at high temperatures; thus, it is important to know this value at the temperature of application for economical erP\;lineering design.The CMC's of a series of surfactants as a function of temperature in the range 77°-392°F (298-473 K) have been determined at high temperatures from heats of dilution, a novel application of calorimetry. Enthalpies of dilution were determined at ambient and elevated temperatures. Surface tension measurements at ambient temperatures served to confirm the assignment of CMC from the heat of dilution data.The CMC's of a pure surfactant were determined in distilled water, in aqueous solutions of NaBr up to 10% salinity, in n-butyl alcohol solutions up to 4% alcohol concentration, and at temperatures of 122°through 347°F (323-448 K). In general, CMC increased with an increase in temperature. The presence of electrolyte at a fixed temperature lowered the CMC and increased the sharpness of the onset of micellization. At 212°F (373 K), the presence of n-butyl alcohol caused the CMC to be lowered but had little effect on the sharpness of micellization. At 347°F (448 K), the alcohol had very little effect on the CMC, apparently because of the change in water properties at high temperatures.The CMC's and solution behavior of three commercial surfactants were determined at 77°, 257°, and 392°F (298, 398, and 473 K), with no added salt. The CMC for these commercial surfactants also increased with temperature.References and figures at the end of paper.Surfactants at high temperatures are used for enhanced oil recovery (EOR) from high-temperature reservoirs as part of chemical slugs and as additives in steamflooding to generate foams for the improvement of sweep efficiency. They are also used in industrial applications, such as cleansing, as emulsifiers for polymerization and other reactions, and as inhibitors in boiler and steam-handling equipment. In all of these applications, knowledge of the CMC as well as the ability to calculate activity coefficients at various temperatures (e.g. for solubility, CMC, and phase behavior properties) is vital to their successful, or at least more economic, implementation.This paper describes the effects of temperature, salinity and alcohol on the CMC and solution properties of a pure surfactant, dodceyltrimethylammonium bromide, (DDTAB) and the effects of temperature on the CMC's of three commercial surfactants. At moderate temperatures, the presence of brine and alcohol is known to lower the CMC of surfactants. Aliphatic alcohols are known to partition into micellar aggregates to varying extents, depending on the alkyl chain lengths of the alcohol and the surfactant, the structure of the surfactant, temperature, micellar size, and ele...

show abstract

Theoretical Behaviour of Microemulsions Geometrical Aspects, Dilution Properties and Role of ALCOHOL.COMPARISON With Experimental Results.

Cited by 80 publications

References 12 publications

Insights into the Intimate Link between the Surfactant/Oil/Water Phase Behavior and the Successful Design of (Alkali)–Surfactant–Polymer Floods

Insights into the Intimate Link between the Surfactant/Oil/Water Phase Behavior and the Successful Design of (Alkali)–Surfactant–Polymer Floods

An NMR self-diffusion investigation of water/xylene/alkyl amine solutions

The Effect of Temperature, Salinity, and Alcohol on the Critical Micelle Concentration of Surfactants

Contact Info

Product

Resources

About