Asphaltene and asphaltene precipitation/deposition

Ghamartale, Ali; Afzali, Shokufe; Rezaei, Nima; Zendehboudi, Sohrab

doi:10.1016/b978-0-323-90510-7.00006-9

Cited by 4 publications

(7 citation statements)

References 113 publications

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“…Asphaltenes are present in crude oil as a colloidal dispersion and forming aggregates with various sizes, depending on crude oil compositions. Variations in crude oil composition, pressure, and temperature have substantial issues, such as asphaltene precipitation or deposition during crude oil production and transportation. − …”

Section: Introductionmentioning

confidence: 99%

Investigation on Asphaltene Dispersion Activity of Tetrabutylammonium Carboxylate Ionic Liquids

et al. 2023

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Asphaltene destabilization is still known as one of the main problems of the petroleum industry and imposes many costs on this industry during crude oil production, transportation, and refining. The most important solution to control this problem is using chemical compounds to disperse asphaltene aggregates. Ionic liquids, as an emerging industrial solvent and catalyst, have been used for this purpose in the last two decades. In this work, three ionic liquids having a tetrabutylammonium cation and oleate, stearate, and cinnamate anions were synthesized and used as asphaltene dispersants. The efficiency of the synthesized ionic liquids on the stability of asphaltene aggregates was investigated using cluster size, polydispersity index, zeta potential, and ultraviolet spectroscopy data. It was found that tetrabutylammonium cinnamate and tetrabutylammonium oleate (dispersion indices of 82.5 and 60.2, respectively) have a much higher efficiency than tetrabutylammonium stearate (dispersion index of 20.6). The results of cluster size, polydispersity index, and zeta potential analysis were confirmed by ultraviolet spectroscopy and optical microscopy data. For instance, the mean radius of asphaltene clusters was 2179.8 nm, reduced to 253, 680, and 1402 nm after adding tetrabutylammonium salt of cinnamate, oleate, and stearate, respectively. The same trend was observed in the results of the polydispersity index (0.417, 0.470, and 0.624) and zeta potential analysis (31.4, 1.81, and −0.56). The cinnamate, oleate, and stearate anions have four, one, and no carbon−carbon π bonds, respectively. It seems that the presence of π bonds that can form π−π interactions with π bonds of the asphaltene molecules is an essential factor in asphaltene stabilization by these ionic liquids. In addition, the results showed that the higher the net negative charge of the anion, the greater the ability of the anion to stabilize asphaltene aggregates. This stabilization, which was mainly done through electrostatic interactions between polar groups of asphaltene and the carboxylate anions, was confirmed by zeta potential data.

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Section: Introductionmentioning

confidence: 99%

Investigation on Asphaltene Dispersion Activity of Tetrabutylammonium Carboxylate Ionic Liquids

et al. 2023

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“…Asphaltene deposition occurs due to changes in reservoir fluid properties and composition over natural depletion and enhanced oil recovery (EOR) processes . Asphaltene deposition in the reservoir alters the rocks’ wettability and reduces oil recovery by blocking the pores and flow path. , Removing asphaltene deposition causes economic burdens, considering production loss and labor work. Thus, preventing asphaltene deposition is vital for sustainable production …”

Section: Introductionmentioning

confidence: 99%

“…Asphaltene deposition in the reservoir alters the rocks’ wettability and reduces oil recovery by blocking the pores and flow path. , Removing asphaltene deposition causes economic burdens, considering production loss and labor work. Thus, preventing asphaltene deposition is vital for sustainable production …”

Section: Introductionmentioning

confidence: 99%

“…Generally, chemical inhibitors, such as surfactants and ionic liquids (ILs), are utilized to prevent/reduce asphaltene deposition . Understanding the asphaltene precipitation/deposition mechanisms is useful for choosing proper chemical inhibitors.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the limitations of laboratory studies, pore-scale simulation can help scientists fully understand the active mechanisms during asphaltene deposition and treatment. Over the past decade, molecular dynamics (MD) simulation has been employed to study complicated molecular-scale phenomena in different scientific fields. ,− MD simulation is a powerful tool that uses Newton’s second law and the developed forcefields based on the experiments to model the phenomena at a molecular scale. Although the asphaltene–inhibitor interaction in a bulk of fluid has been studied using MD simulation during the asphaltene precipitation, − this matter has not been addressed during the deposition process.…”

Section: Introductionmentioning

confidence: 99%

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Control of Asphaltene Deposition by Chemical Inhibitors in Calcite Pore: Molecular Dynamics Approach

Ghamartale

Zendehboudi

Mohamadi‐Baghmolaei

2022

Ind. Eng. Chem. Res.

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Asphaltene deposition is a major problem during oil production and transportation that imposes extra treatment costs and reduces oil production. Historically, various chemical inhibitors have been developed to resolve the asphaltene deposition issue. However, the inhibitors are usually effective for a specific type of crude oil and asphaltene since asphaltene's nature is different for various oil samples. To develop a proper chemical inhibitor, the interaction between the inhibitor and asphaltene needs to be explored. This work employs a molecular dynamics (MD) simulation strategy to study asphaltene deposition on a calcite surface considering chemical inhibitors. Two asphaltene structures with potential to form hydrogen bond (A2) and without potential to form hydrogen bond (A3) are considered in this study. The selected inhibitors, including noctylphenol (OP) and 1-butyl-3-methylimidazolium chloride (as an ionic liquid (IL)), can form van der Waals, Coulomb, and hydrogen bonds with asphaltene molecules. The results show that the OP reduces the asphaltene aggregation by attaching to the asphaltene through hydrogen bonds. In the presence of OP, the Lennard-Jones (LJ) and Coulomb energies between asphaltene (A2) and calcite are reduced by 400 and 1000 kJ/mol units, leading to the asphaltene deposition reduction by adsorbing on the calcite surface and providing a hindrance layer. The IL is able to cope with the quadrupole−quadrupole interaction between asphaltene polyaromatic cores and reduce the asphaltene face-to-face aggregation. However, IL cannot provide a hindrance layer near the calcite surface since it does not have a long hydrocarbon tail. Therefore, the combination of inhibitors can benefit the inhibition process as both prevention mechanisms will be active. The 3:1 OP−IL ratio shows the optimum efficiency. At this ratio, inhibitors reduce the aggregation from 20 to less than 10 and the deposition rate from 1 to 0.8 compared to the case without the inhibitors. Also, the deposited aggregates have low compaction with a spherical shape, which is easy to dislodge in a dynamic situation. This research aims to demystify the asphaltene−inhibitor behaviors during asphaltene deposition, which can be a useful practice for designing of future chemical inhibitors for flow assurance issues.

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Toward sustainable roads: a critical review on nano-TiO2 application in asphalt pavement

Ayar,

Ruhi,

Baibordy

et al. 2024

Innov. Infrastruct. Solut.

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Asphaltene and asphaltene precipitation/deposition

Cited by 4 publications

References 113 publications

Investigation on Asphaltene Dispersion Activity of Tetrabutylammonium Carboxylate Ionic Liquids

Investigation on Asphaltene Dispersion Activity of Tetrabutylammonium Carboxylate Ionic Liquids

Control of Asphaltene Deposition by Chemical Inhibitors in Calcite Pore: Molecular Dynamics Approach

Toward sustainable roads: a critical review on nano-TiO2 application in asphalt pavement

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