Analytic model for the electrowetting properties of oil-water-solid systems

Cavalli, Andrea; Bera, Bijoyendra; Ende, Henricus T.M. van den; Mugele, Friedrich Gunther

doi:10.1103/physreve.93.042606

Cited by 9 publications

(14 citation statements)

References 31 publications

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“…Experimentally, the presence of such a film and the dependence of its thickness on the salinity of the brine has been reported recently by our team for a simplified system in the absence of surface active species. 21 In that work and in a subsequent theoretical study that included charge regulation, 37 it was possible to reproduce the experimentally observed salinity-dependent wetting transition within the DLVO theory by decomposing φ( h ) explicitly into its electrostatic, van der Waals, and (exponentially decaying) short-range hydration contribution by writing φ( h ) = φ el ( h ) + φ vdW ( h ) + φ h ( h ) with explicit expressions for each term. 21 The model and the complementary surface charge measurements confirmed that the alteration of the water contact angle from almost complete water wetting in the presence of Na + or K + to finite contact angles in the presence of Ca 2+ or Mg 2+ could be attributed to a reversal of the muscovite/water interfacial charge.…”

Section: Discussionmentioning

confidence: 99%

Salinity-Dependent Contact Angle Alteration in Oil/Brine/Silicate Systems: the Critical Role of Divalent Cations

et al. 2017

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The effectiveness of water flooding oil recovery depends to an important extent on the competitive wetting of oil and water on the solid rock matrix. Here, we use macroscopic contact angle goniometry in highly idealized model systems to evaluate how brine salinity affects the balance of wetting forces and to infer the microscopic origin of the resultant contact angle alteration. We focus, in particular, on two competing mechanisms debated in the literature, namely, double-layer expansion and divalent cation bridging. Our experiments involve aqueous droplets with a variable content of chloride salts of Na+, K+, Ca2+, and Mg2+, wetting surfaces of muscovite and amorphous silica, and an environment of ambient decane containing small amounts of fatty acids to represent polar oil components. By diluting the salt content in various manners, we demonstrate that the water contact angle on muscovite, not on silica, decreases by up to 25° as the divalent cation concentration is reduced from typical concentrations in seawater to zero. Decreasing the ionic strength at a constant divalent ion concentration, however, has a negligible effect on the contact angle. We discuss the consequences for the interpretation of core flooding experiments and the identification of a microscopic mechanism of low salinity water flooding, an increasingly popular, inexpensive, and environment-friendly technique for enhanced oil recovery.

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Section: Discussionmentioning

confidence: 99%

Salinity-Dependent Contact Angle Alteration in Oil/Brine/Silicate Systems: the Critical Role of Divalent Cations

et al. 2017

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“…Adsorption fate of surfactant is the main concern in this type of production methods that limits the use/application of various surfactants for different oil reservoirs. A number of researchers have focused on this important issue 9 , 10 . For instance, Rodriguez 9 studied the adsorption of surfactants on carbonate rock samples taken from an oil reservoir in Saudi Arabia 9 .…”

Section: Introductionmentioning

confidence: 99%

“…According to the results, when the flow rate increases, the amount of adsorption will decrease. Besides the experimental works, several valuable analytical models have been developed to determine the adsorption behavior of surfactants from mathematical viewpoint 10 – 12 . Such models provide very deep understanding regarding adsorption phenomenon of surfactants onto the solid surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Such models provide very deep understanding regarding adsorption phenomenon of surfactants onto the solid surfaces. Coupling these analytic models and sensitivity analysis method could help us to figure out how special surfactant behaves in a system containing surfactant, oil, and reservoir rock; using these approaches lead to better whole picture of wettability alteration using surfactant injection due to different mechanisms including wettability gradient, aqueous drop autophobing, and chemical reactions 10 – 12 .…”

Section: Introductionmentioning

confidence: 99%

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Spotlight on the New Natural Surfactant Flooding in Carbonate Rock Samples in Low Salinity Condition

Ahmadi

Shadizadeh

2018

Sci Rep

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Recently, utilization of surfactant for EOR purposes in carbonate petroleum reservoirs has received the attention of many researchers. Surfactants generally appear to improve oil production through wettability alteration and reduction of interfacial tension (IFT) between oil and water phases. Loss of surfactant due to adsorption process is considered as an unfavorable phenomenon in surfactant flooding while conducting an EOR operation. In this study, a new plant-derived surfactant, called Zyziphus Spina Christi (ZSC), with various magnitudes of salinity is employed. The adsorption behavior of this surfactant is investigated using the conductivity approach to explore the impacts of salt concentration on adsorption rate through batch tests. Core flooding tests are also conducted to study the effects of surfactant/salinity on recovery factor and relative permeability. Employing the kinetics and isotherm models, MgCl2 and KCl exhibit the greatest and lowest influence on the adsorption phenomenon, respectively. It is also concluded that the pseudo-second order kinetics and Freundlich isotherm model can satisfactorily describe the adsorption behavior of the surfactant onto carbonates in the presence of salt for the kinetics and equilibrium tests conditions, respectively. According to the production history, it is found that increasing surfactant concentration leads to a considerable increase in oil relative permeability and consequently improvement of oil recovery.

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“…A subsequent more detailed modeling effort highlighted the role of charge regulation and short-range chemical forces for the exact value of the contact angles. 55…”

Section: Introductionmentioning

confidence: 99%

Cationic Hofmeister Series of Wettability Alteration in Mica–Water–Alkane Systems

et al. 2018

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The specific interaction of ions with macromolecules and solid–liquid interfaces is of crucial importance to many processes in biochemistry, colloid science, and engineering, as first pointed out by Hofmeister in the context of (de)stabilization of protein solutions. Here, we use contact angle goniometry to demonstrate that the macroscopic contact angle of aqueous chloride salt solutions on mica immersed in ambient alkane increases from near-zero to values exceeding 10°, depending on the type and concentration of cations and pH. Our observations result in a series of increasing ability of cations to induce partial wetting in the order Na+, K+ < Li+ < Rb+ < Cs+ < Ca2+ < Mg2+ < Ba2+. Complementary atomic force microscopy measurements show that the transition to partial wetting is accompanied by cation adsorption to the mica–electrolyte interface, which leads to charge reversal in the case of divalent cations. In addition to electrostatics, hydration forces seem to play an important role, in particular for the monovalent cations.

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Analytic model for the electrowetting properties of oil-water-solid systems

Abstract: Analytic model for the electrowetting properties of oil-water-solid systems Cavalli, A.; Bera, B.; van den Ende, D.; Mugele, F.

Cited by 9 publications

References 31 publications

Salinity-Dependent Contact Angle Alteration in Oil/Brine/Silicate Systems: the Critical Role of Divalent Cations

Salinity-Dependent Contact Angle Alteration in Oil/Brine/Silicate Systems: the Critical Role of Divalent Cations

Spotlight on the New Natural Surfactant Flooding in Carbonate Rock Samples in Low Salinity Condition

Cationic Hofmeister Series of Wettability Alteration in Mica–Water–Alkane Systems

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