Ultralow Interfacial Tensionasa Function of Pressure

Fotland, Per; Skauge, Arne

doi:10.1080/01932698608943479

Cited by 28 publications

(14 citation statements)

References 16 publications

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“…The effect of pressure on surfactant phase behavior, however, is ignored in the original expression for HLD. Large pressure changes, such as those that occur in enhanced oil recovery applications, increases the affinity of anionic surfactants to brine [19][20][21][22][23][24][25][26]. Roshanfekr and Johns [4] differentiated the effect of pressure and the change in oil composition as gas is added or evolves from the oil on the phase behavior.…”

Section: Introductionmentioning

confidence: 99%

Robust Flash Calculation Algorithm for Microemulsion Phase Behavior

Khorsandi

Johns

2016

J Surfact & Detergents

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The HLD‐NAC model was recently modified to match and predict microemulsion phase behavior experimental data for Winsor type III regions. Until now, the HLD‐NAC model could not generate realistic phase behavior for type II− and type II+ two‐phase regions, leading to significant saturation and composition discontinuities when catastrophe theory is applied. These discontinuities lead to significant failures in modeling surfactant applications. We modify the HLD‐NAC equations to ensure consistency over the entire composition space including type II− and II+ regions. A robust and efficient algorithm is developed that always converges and provides continuous estimates with any formation variable of tie lines and triangles for all Winsor types. Discontinuities are eliminated and limiting tie lines near critical points are determined analytically. The tuning procedure is demonstrated using several sets of experimental data. Excellent predictability of tie lines and tie triangles, and solubilization ratios are shown.

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Section: Introductionmentioning

confidence: 99%

Robust Flash Calculation Algorithm for Microemulsion Phase Behavior

Khorsandi

Johns

2016

J Surfact & Detergents

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“…The numerical value of the empirical constant has been confirmed by comparing phase volumes to direct measurement of interfacial tensions by laser light scattering (Fotland and Skauge, 1986;Skauge and Fotland, 1990). There is a vast literature on surfactant enhanced oil recovery (EOR) available, much of which is included and discussed in a recent review by Hirasaki et al (2011).…”

Section: Introductionmentioning

confidence: 94%

A Strategy for Low Cost, Effective Surfactant Injection

Spildo¹,

Djurhuus²,

Sun³

et al. 2011

Proceedings

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Keywords: surfactant solubility phase behaviour microemulsion interfacial tension retention a b s t r a c t Ideally, in a chemical flooding process, one would like to inject a surfactant solution that has good solubility at the relevant conditions, ultralow interfacial tension (efficient oil mobilisation) and low loss of surfactant (better economics) in the porous medium. The key question is -can you have low loss of surfactant, i.e. low retention, at ultralow interfacial tension?To answer this question, we have undertaken a systematic study of surfactant solubility, phase behaviour, interfacial tension and retention as a function of salinity for a given surfactant formulation. The idea is to explore the interrelationship between these properties and find the best condition(s) for combined low interfacial tension and low retention in a surfactant flooding process.For the investigated surfactant formulation, ultra-low interfacial tensions ( o0.01 mN/m) can be found in the Winsor III region at optimal salinity. The aqueous solution at optimal salinity is, however, turbid, and retention values are high. On the other hand, for light oils, there are regions in the Winsor I area where (i) interfacial tensions are low (0.01 mN/m o IFT o0.1 mN/m), but not ultralow, (ii) aqueous solutions are clear and (iii) retention is 10 times lower than at optimal salinity. The search for an optimum surfactant formulation has to consider solution properties and retention in addition to the low interfacial tension. Based on our result, we therefore propose that Winsor I phase behaviour is the best option for a compromise between the properties in question.

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“…its alkane carbon number (CAN) or equivalent (EACN), the water phase sa linity, alcoho l type and concentration when app licab le ( 18), as well as temperature, and so metimes eve n pressure ( 19). As far as the prese nt paper is co nce rne d, the formulat ion is changed in non ioni c sys tems by varying either the ethoxy lation deg ree of the surfactant, as its average number of ethylene oxi de gro ups per molecule (EON) or the tem perature, whereas it is the sa linity (wt.% NaC I) of the aqueous phase which is modified for ionic system s.…”

Section: Formulations At Ne a R Unity Water-to-oil Ratio (Wor)mentioning

confidence: 99%

Surfactant-Oil-Water Systems Near the Affinity Inversion. XII. Emulsion Drop Size Versus Formulation and Composition

Pérez

Zambrano

Ramirez

et al. 2002

Journal of Dispersion Science and Technology

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Emulsion drop size depends on the both fo rmulation and compos ition of the surfactant-oil-water system. as well as on the stirring conditions prevailing during emulsification. General trends versus f ormulation or compos ition changes are presented. Howevel; it is shown that the effects are not independent and that a prop er combination of these param eters allows the attainm ent of vel)' small drop size. even at low stirring energy. An overall phenomenology is presented on a twodimensional fo rmulation-comp osition map fro m which it is easy to select the best emulsification conditions.

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Ultralow Interfacial Tensionasa Function of Pressure

Cited by 28 publications

References 16 publications

Robust Flash Calculation Algorithm for Microemulsion Phase Behavior

Robust Flash Calculation Algorithm for Microemulsion Phase Behavior

A Strategy for Low Cost, Effective Surfactant Injection

Surfactant-Oil-Water Systems Near the Affinity Inversion. XII. Emulsion Drop Size Versus Formulation and Composition

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