Evaluation of effect of temperature and pressure on the dynamic interfacial tension of crude oil/aqueous solutions containing chloride anion through experimental and modelling approaches

Lashkarbolooki, Mostafa; Ayatollahi, Shahab

doi:10.1002/cjce.23059

Cited by 23 publications

(8 citation statements)

References 37 publications

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“…This observation is absent in Figure 2a,b, further confirming that the kinetics of PAC molecules is enhanced by ions in small droplet systems. This observation is similar to the work of Lashkarbolooki et al, 64,65 where it was found that after adding ions the dynamic IFT of crude oil/water interfaces decreased faster with the presence of natural surfactants (amphiphilic, tending to reduce IFT), i.e., resins and asphaltenes, suggesting the adsorption kinetics of surfactants were enhanced by increasing salinity. Contrarily, in the presence of a large droplet, the addition of salt does not apparently enhance the adsorption.…”

Section: Resultssupporting

confidence: 90%

Probing the Effect of NaCl Concentrations on a Model Asphaltene Adsorption onto Water Droplets of Different Sizes

Qiao

Cheng²,

Song

et al. 2019

Energy Fuels

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While a large amount of attention has been paid to investigating the effects of various factors (e.g., solvent and asphaltene molecular structure) on asphaltene adsorption, the effect of salinity, particularly brine water, has not been systematically studied at the atomistic level despite the ubiquitous presence of salt in crude oil processing. In this work, the adsorption behaviors of a model asphaltene at the oil/brine interface were investigated using molecular dynamics simulations. It was found that the addition of salt greatly enhances the adsorption kinetics in systems with a small droplet, while this enhancement was insignificant for systems with a large droplet. Furthermore, dependent on droplet size, salinity has different effects on the adsorbed structures. In systems with a small droplet, the addition of ions facilitates the direct contact of adsorbed model asphaltene molecules with water surfaces, while in systems with a large droplet, such direct contact was suppressed. Detailed analysis of hydrogen bonding, water/ion distributions, and shape transformation of the water droplet suggests that these observations result from the different degrees of hydration in systems with small and large droplets: small droplets have large surface area to volume ratio, and thus cannot facilitate strong ion hydrations, while large droplets manifest strong ion hydrations, leading to reduced model asphaltene and water attractions. The results reported here can enhance our understanding of emulsification mechanisms in high-salinity crude oil at an atomistic level.

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Section: Resultssupporting

confidence: 90%

Probing the Effect of NaCl Concentrations on a Model Asphaltene Adsorption onto Water Droplets of Different Sizes

Qiao

Cheng²,

Song

et al. 2019

Energy Fuels

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“…An overview of research papers on the IFT of crude oilbrine mixtures showed contradictory results (Abdel-Wali 1996;Bai et al 2010;Cai et al 1996;Dehghan et al 2015a, b;Ikeda et al 1992;Lashkarbolooki and Ayatollahi 2018;Mohamed et al 1999;Serrano-Saldaña et al 2004), as they report different IFT values, trends and governing mechanisms. In comparison with the pure systems, the IFT of crude oil-brine mixtures is complex functions of different parameters such as pressure, temperature, salinity, pH, TAN, and polar components which makes it more difficult to deal with (Buckley and Fan 2007).…”

Section: Ift Measurementsmentioning

confidence: 99%

Dissociation of polar oil components in low salinity water and its impact on crude oil–brine interfacial interactions and physical properties

Mokhtari

Ayatollahi

2018

Pet. Sci.

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Despite many efforts into the study of fluids interaction in low salinity water flooding, they are not probing the basics of transport phenomena between the involved phases. This work is aimed to bring new understanding of fluid-fluid interaction during low salinity water flooding through a series of organized experiments in which a crude oil sample with known properties was kept in contact with different brine solutions of various ionic strengths. Measuring brine pH, conductivity and crude oil viscosity and density for a period of 45 days illustrates the strong effect of the contact time and ionic strength on the dissociation of polar components and physical properties of the crude oil and brine. Besides, the interfacial tension (IFT) measurements show that the interfacial interactions are affected by several competitive interfacial processes. By decreasing the ionic strength of the brine, the solubility of naphthenic acids in the aqueous solution increases, and hence, the conductivity and the pH of the aqueous phase decrease. To verify this important finding, UV-Vis spectroscopy and 1 H NMR analysis were also performed on aged brine samples. Notably, there is an ionic strength of brine in which the lowest IFT is observed, while the other physical properties are remained relatively unchanged.

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“…Applying a decay model is the simple and appropriate way to estimate the adsorption time (the required time to reach meso-equilibrium). 30,44 When two immiscible fluids such as crude oil and tuned brine interact competitively with a rock substrate, contact angle measurement is particularly useful. The contact angle (θ) can be changed by the IFTs between the three phases according to Young's equation (i.e., γ cb × cos θ = γ rb − γ rc ), where γ is the equilibrium IFT and subscripts r, b, and c refer to the rock, brine, and crude oil phases, respectively.…”

Section: Materials and Methodologymentioning

confidence: 99%

Surface Elemental Analysis of a Crude Oil-Modified Seawater–Carbonate Rock System

Taghizadeh

Lashkarbolooki

2023

Energy Fuels

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To clarify the mechanism of wettability alteration of the dolomite rock surface by various ions, the extracted asphaltene and resin fractions from the crude oil using an American Petroleum Institute (API) gravity of 27.3 were analyzed by the elemental analysis (CHNS analyzer) in the first step and the attachment of these polar components to the rock surface was obtained by calculation of the coverage ratio of dominant elements, according to the atomic percentage obtained by the energy-dispersive X-ray analysis. Then, eight engineered brines were prepared by spiking seawater with 2 times Ca2+, Mg2+, and SO4 2– and their combination in two categories, with and without depleting NaCl to reach the ionic strength of seawater. Finally, the performance of these solutions on the desorption of polar components from the surface was compared to the seawater through interfacial tension and contact angle measurements and spreading coefficient calculation as well as the characterization procedure and calculation of the uncoverage ratio. It is found that even though the addition of all active ions including Ca2+, Mg2+, and SO4 2– contributed to wettability alteration with different desorption rates, their performance strongly depends on the depletion of solutions from NaCl in various ways. It is also found that the wettability of the dolomite rock surface can be changed to the water-wet state, while about 50% of the adsorbed organic acids on the rock surface desorbed from the surface.

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Evaluation of effect of temperature and pressure on the dynamic interfacial tension of crude oil/aqueous solutions containing chloride anion through experimental and modelling approaches

Cited by 23 publications

References 37 publications

Probing the Effect of NaCl Concentrations on a Model Asphaltene Adsorption onto Water Droplets of Different Sizes

Probing the Effect of NaCl Concentrations on a Model Asphaltene Adsorption onto Water Droplets of Different Sizes

Dissociation of polar oil components in low salinity water and its impact on crude oil–brine interfacial interactions and physical properties

Surface Elemental Analysis of a Crude Oil-Modified Seawater–Carbonate Rock System

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