Experimental evaluation of asphaltene dispersants performance using dynamic light scattering

Paridar, Soroush; Nazar, Ali Reza Solaimany; Karimi, Yavar

doi:10.1016/j.petrol.2018.01.013

Cited by 13 publications

(6 citation statements)

References 35 publications

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“…6 shows a Zimm plot of VO-78. A Zimm plot of our data revealed a trend contrary to what one would have observed from a typical trend of increasing concentration with a concomitant increase in KC/R values [15], [16], [30]. We could not obtain a 1/Mw value by simple extrapolation.…”

Section: Static Light Scatteringcontrasting

confidence: 99%

“…Static light scattering (SLS) is a sensitive, non-invasive technique that depends on the measurement of the intensity of light scattered particles as a function of the angle from the transmitted beam [7], [15], [16]. The relationship between light intensity and scattering angle depends on factors such as particle size, shape, refractive index, and size distribution [16].…”

Section: Introductionmentioning

confidence: 99%

“…Dynamic light scattering (DLS), on the other hand, provides the intensity autocorrelation function, which captures the Brownian motion of the suspended entities in a solvent, leading to an estimation of the hydrodynamic radii of these entities. Performing these two light scattering modes concurrently provides a rich set of information regarding the aggregates, including the hydrodynamic dimensions, the molecular weights, and the second virial coefficients [15], [16]. In this paper, we explore the use of this technique on the model asphaltene-like molecule to study its aggregation in different pure and mixed solvents with different levels of aromaticity.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Aggregation Behavior and Molecular Weight Changes of Asphaltene Model Compound

Nsiah

Fiafor²,

Bhattacharjee³

2022

EJCHEM

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We investigate the aggregation of Violanthrone-78 (VO-78), a model asphaltene compound, in mixtures of toluene and n-heptane (heptol) using spectroscopic and dynamic and static light scattering techniques. The light scattering experiments were conducted using pure toluene and n-heptane, as well as 25/75, 50/50, and 75/25 heptol solvents. Furthermore, the concentration of VO-78 varied from 10-8 M to 10-3 M in these suspensions. The dynamic light scattering experiments were used to study the aggregate sizes from the intensity autocorrelation function at different n-heptane volume fractions. The results show the onset of aggregation of about 50 % n-heptane volume fractions. The aggregate sizes in toluene, within the range of concentrations examined, were below the instrument's detection limit (< 5 nm) but increased with increasing dosages of n-heptane. On the other hand, the aggregate size in pure heptane was observed to be greater than the maximum limit of the instrument (> 10 μm). Furthermore, the static light scattering experiments provided an anomalous behavior. Increasing concentrations of VO-78 in the solvent resulted in lowering the parameter Kc/Rq, where c is the molar concentration.

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Section: Static Light Scatteringcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Aggregation Behavior and Molecular Weight Changes of Asphaltene Model Compound

Nsiah

Fiafor²,

Bhattacharjee³

2022

EJCHEM

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“…In the formula: P -viscosity reduction rate of heavy oil, %; μ0 -viscosity of heavy oil before adding viscosity reducer, mPa•s; μ1 -viscosity of heavy oil after adding viscosity reducer, mPa•s. The greater the viscosity reduction rate, the better the viscosity reduction effect of the viscosity reducer on heavy oil [11,12] .…”

Section: Viscosity Reduction Effect Evaluation Methodsmentioning

confidence: 99%

Development and Application of The Graft Coated Viscosity Reducer

Zhou,

Li,

Yao

et al. 2023

J. Phys.: Conf. Ser.

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The graft coated viscosity reducer was developed for the high cost of mixing light oil. The viscosity reducing mechanism is that the polar hypertonic agents in thSe viscosity reducer dissociate the net structures of the resin and asphalt and then form eutectic grafting with these dissociated macromolecules when the heavy oil in the water was broken or in the solution of associating state. The heavy oil takes shape of small particles while the resin is out of structure and not easy to get agglomerated. The released resin and the coating agent for the viscosity reducer form a layer of film on the surface of small oil particles to prevent the resin and asphalt from network structuring again. The heavy oil particles are not easy to be in coalescence concerning electrical repulsion and solution association among the coating in between. The heavy oil particles are dispersed in the medium to achieve the stabilization of viscosity reduction. For example, the viscosity of the crude oil from Liaohe Oilfield is 87.2mP•s after adding the agent at 50°C (the original viscosity was 4919mP•s). The viscosity reducer did not corrode the pipelines and wellbores and had no effect on the dehydration of united stations. The construction was carried out by continuously dripping the viscosity reducer into the 16 wells of Liaohe Oilfield. The viscosity all decreased to below 100mP•s afterwards. The current, load and other parameters all decreased along with the application. So this method could take the place of mixing light oil.

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“…La inhibición y estabilización de los asfaltenos es fundamental para mantener la productividad de los pozos petroleros que producen petróleos inestables, es decir petróleos que tiene tendencia a formar depósitos de asfaltenos (Ashoori, Sharifi, Masoumi & Salehi, 2017). La técnica más utilizada para estabilizar los asfaltenos, es la inhibición de la formación de agregados mediante la aplicación de productos químicos que intervienen en el proceso de floculación de las partículas de asfaltenos y las mantienen en suspensión (Paridar, Solaimany & Karimi, 2018). Los productos químicos utilizados están formulados a base de disolventes orgánicos aromáticos y resinas sintéticas; la función es reforzar la capa estabilizante natural y dispersar las partículas evitando que se atraigan y formen agregados (Li et al, 2020).…”

Section: Introductionunclassified

Evaluación del aceite de Anacardium occidentale como inhibidor de floculación de asfaltenos

Tocuyo

Velásquez²

2020

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En la investigación se evaluó, a nivel de laboratorio, al aceite de cáscaras de la semilla de Anacardium occidentale (CNSL), como inhibidor de floculación de asfaltenos. Se prepararon tres mezclas de CNSL en Diésel (40, 60 y 80% V/V) y se aplicaron cuatro dosis (2, 4, 6 y 8 µL) a 10 mL de una muestra de petróleo del Campo El Furrial, Venezuela, así como, el Diésel y el aceite puros, para un total de cinco productos evaluados a las cuatro dosis. Se midió como variable respuesta el Umbral de Floculación de los asfaltenos (UF), como el volumen de n-heptano aplicado al petróleo hasta observar en un microscopio óptico la formación de agregados. El diseño experimental fue factorial, con dos factores experimentales, Producto y Dosis y una variable respuesta UF, medida por triplicado para cada combinación producto-dosis. Se aplicó ANOVA factorial y test LSD de Fisher con α = 0,05. Se obtuvo que el umbral de floculación fue dependiente de los dos factores de forma significativa (p < 0,05) y la presencia del CNLS en la mezcla produce efecto inhibidor, con un máximo de eficiencia de 43,6% para el producto al 80% CNLS a la dosis de 4 µL/10mL de petróleo.

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Experimental evaluation of asphaltene dispersants performance using dynamic light scattering

Cited by 13 publications

References 35 publications

Investigation of Aggregation Behavior and Molecular Weight Changes of Asphaltene Model Compound

Investigation of Aggregation Behavior and Molecular Weight Changes of Asphaltene Model Compound

Development and Application of The Graft Coated Viscosity Reducer

Evaluación del aceite de Anacardium occidentale como inhibidor de floculación de asfaltenos

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