Screening of inhibitors for remediation of asphaltene deposits: Experimental and modeling study

Madhi, Mehdi; Kharrat, Riyaz; Hamoule, Touba

doi:10.1016/j.petlm.2017.08.001

Cited by 56 publications

(32 citation statements)

References 17 publications

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“…It is clearly seen that the asphaltene content increase, when the ˚API decreases due to the asphaltene structure holding sulphur, nitrogen and oxygen. Similar results were found in various crude oil investigations by the researchers and industrialists in the petroleum field of applications [7,8]. The ratio of resin to asphaltene was found to be 1.4 which is greater than 1 and that causes less asphaltene deposition problem.…”

Section: Resultssupporting

confidence: 87%

Impact of Asphaltene Presence in Heavy Crude Oil and Its Separation Technique

Nagalakshmi,

Sivasakthi*

2019

IJITEE

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Heavy crude oil is the crude oil with no gas composition and major constituents are asphaltene, resins, saturates and aromatics. Heavy crude oil is capable of producing a low high valued products and high low valued products. Asphaltene is a molecular substance that acts as a binding molecule to help in the recovery of heavy crude oil. On the contrary, an asphaltene deposition becomes troublesome in the heavy crude oil transportation through pipelines. In this research article, the heavy crude oil was collected from the western part of Indian oilfield and subjected to the separation of asphaltene content by the addition of aliphatic solvent. The results of separation of asphaltene from the heavy crude oil by the addition of n-heptane and n-hexane were found to be 15 wt. % and 17 wt. %. The asphaltene will cause moderate deposition problem during the production and transportation of investigated heavy crude oil.

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Section: Resultssupporting

confidence: 87%

Impact of Asphaltene Presence in Heavy Crude Oil and Its Separation Technique

Nagalakshmi,

Sivasakthi*

2019

IJITEE

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“…Additives (e.g. dispersants) and co-solvent can aid deposit removal (Darabi and Sepehrnoori, 2015;Madhi et al, 2018;Trbovich and King, 1991). Alternatively, de-asphalted oil may be reinjected to dissolve deposits (Jamaluddin and Nazarko, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Inhibitors can also be effective at the molecular level, for example, dodecylbenzyl sulfonic acid disperses asphaltene aggregates to form a stable colloid when used in low concentration and dissolves asphaltenes to form a solution when used in higher concentration Hashmi and Firoozabadi, 2013a). Inhibitors can delay the onset of asphaltene precipitation (Al-Sahhaf et al, 2002), decrease (or increase) the precipitated amount (Goual and Firoozabadi, 2004;Madhi et al, 2018) and reduce the particle size (Mansur et al, 2012). Inhibitors may also alter the structure of flocculated asphaltene from globular to filamentary (Goual et al, 2014;Goual and Sedghi, 2015).…”

Section: Introductionmentioning

confidence: 99%

Mechanism of an asphaltene inhibitor in different depositing environments: Influence of colloid stability

Campen

Moorhouse

Wong

2020

Journal of Petroleum Science and Engineering

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Additives are used to reduce unwanted carbonaceous deposits of asphaltenes on surfaces during petroleum production from natural oil and gas reservoirs. The working mechanism of formulated additive packages can be multifaceted. Additives may be effective in the bulk fluid by preventing asphaltenes aggregation, as well as at the surface by preventing asphaltenes adhesion. In this paper, we investigate the numerous different mechanisms by which an asphaltene inhibitor can interfere with the formation of carbonaceous deposits using a combination of techniques including dynamic light scattering to determine particle size distribution, quartz crystal microbalance with dissipation monitoring to examine deposition behaviour and atomic force microscopy to probe deposit morphology. The tested inhibitor prevents deposition of asphaltenes in toluene, where asphaltenes exist as a stable colloidal dispersion of nanoaggregates, by forming barrier-type films that inhibit asphaltenes adhesion and displacing adsorbed thin films of asphaltenes. However, inhibitor performance in heptane-toluene, where asphaltenes are destabilised, depends on the degree of destabilisation. At low heptane volume fraction, inhibitor slows the rate of deposition and deposition rate decreases with increasing inhibitor concentration. However, at high heptane volume fraction, inhibitor can increase the deposition rate, particularly when used in high concentration. At high heptane volume fraction, inhibitor addition alters the morphology of the deposit from that consisting of large flocculent aggregates to that consisting of smaller, submicrometer aggregates. This is consistent with the finding that inhibitor acts as an anti-agglomerant and prevents the formation of large aggregates in the bulk liquid. This paper shows that the impact of inhibitor addition depends on the environmental conditions encountered and the degree of destabilisation of the asphaltenes. Where inhibitor addition alters the nature of depositing species from large flocculent aggregates to smaller submicrometer aggregates, an increase in deposition rate may be observed.

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“…Para mantener la estabilidad se utilizan productos químicos dispersantes, formulados a base de resinas sintéticas y solventes aromáticos (Saeedi & Hasan, 2017;Pereira et al, 2011). Los componentes activos de los productos dispersantes de asfaltenos son las resinas, las cuales son consideradas surfactantes y cuyo principio de acción depende del tipo específico de la misma, de su composición y grupos funcionales que posean (Madh, Kharrat & Hamoule, 2017;León, Quintero, Cervantes & Rangel, 2012;Sánchez, Sánchez, González & Ramírez, 2017).…”

Section: Introductionunclassified

Evaluación de aceite de Jatropha gossypiifolia como estabilizante de asfaltenos en una muestra de petróleo a nivel de laboratorio

Velásquez¹

2020

Rev. fuentes reventón enrg.

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Asphaltenes are condensed polyaromatic solids that are present in oil forming colloidal suspensions in a thermodynamic system that in some cases tends to be unstable producing flocculation and aggregation. In the oil industry, dispersant chemical compounds are used to minimize the flocculation of asphaltenes to avoid clogging problems in pipes and production equipment, which represent an important investment since they are formulated with synthetic resins and oils, in addition to expensive solvents. This research evaluates the use of Jatropha gossypifolia oil as an active stabilizing component of asphaltenes, mixed with diesel as a solvent in laboratory level tests. Five dilutions of oil in diesel (10 to 50%) were evaluated. The procedure consisted of observing the asphaltene aggregates under an optical microscope when applying n-heptane to a crude oil sample from Monagas State, Venezuela, the volume of n-heptane used being the flocculation onset. Successive volumes of each dilution were then applied until the dispersion of the aggregates was achieved, being this volume the point of dispersion. In addition, xylene was used as a standard dispersant to compare the performance of the dissolutions. The tests were performed at two temperatures of 25 and 40 ºC. A factorial statistical design was used with experimental factors dissolution and temperature and dependent variable instability index, with ANOVA analysis and Tukey HSD test with α = 0.05. With the application of the solutions, a greater dispersion of the aggregates was achieved with efficiencies greater than 94% with respect to the dispersion obtained with xylene, being the solution with 40% oil the most efficient. The statistical results showed that stability is dependent on the solution used and independent of the test temperature with a 95% confidence level.

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Screening of inhibitors for remediation of asphaltene deposits: Experimental and modeling study

Cited by 56 publications

References 17 publications

Impact of Asphaltene Presence in Heavy Crude Oil and Its Separation Technique

Impact of Asphaltene Presence in Heavy Crude Oil and Its Separation Technique

Mechanism of an asphaltene inhibitor in different depositing environments: Influence of colloid stability

Evaluación de aceite de Jatropha gossypiifolia como estabilizante de asfaltenos en una muestra de petróleo a nivel de laboratorio

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