Investigation of the performance of several chemical additives on inhibition of asphaltene precipitation

Kashefi, Sepideh; Shahrabadi, Abbas; Jahangiri, Shahin; Lotfollahi, Mohammad Nader; Bagherzadeh, Hadi

doi:10.1080/15567036.2016.1198847

Cited by 26 publications

(20 citation statements)

References 21 publications

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“…As can be seen, asphaltenes possess a larger λ – subcomponent compared to λ + , suggesting their basic nature, which is also confirmed by the acid and base numbers provided in Table , where crude oil’s base number is much larger than its acid number. Several other researchers have also indicated the electron donor properties of asphaltenes. ,, Another point in Table is that both model oil and HDES-included model oil show polarity that improves the AB interaction in this medium.…”

Section: Resultsmentioning

confidence: 94%

“…Several other researchers have also indicated the electron donor properties of asphaltenes. 1,5,17 Another point in Table 2 is that both model oil and HDESincluded model oil show polarity that improves the AB interaction in this medium.…”

Section: Resultsmentioning

confidence: 99%

“…The application of deep eutectic solvents (DESs) as asphaltene inhibitors has also been investigated but only in a few recent studies. For instance, Kashefi et al 17 claimed that a choline chloride-based DES, chcl:phenylacetic acid (1:1), could be utilized to delay the onset point of asphaltene precipitation via decreasing the asphaltene's mean particle size. Jahangiri et al 18 conducted a microscopic study to investigate the precipitation of asphaltene particles in the presence of another chcl-based DES, chcl:monoethylene glycol (1:1).…”

Section: Introductionmentioning

confidence: 99%

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Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

et al. 2021

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This study aims to theoretically investigate the performance of an ionic liquid-based hydrophobic deep eutectic solvent (HDES), methyltrioctylammonium chloride:glycerol (1:2), as an asphaltene deposition inhibitor. To do so, the concept of surface energy was implemented by applying the extended DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. Accordingly, the impact of surface energy components in terms of electrostatic (EL), acid–base (AB), Lifshitz–van der Waals (LW), and Brownian (Br) interactions on the deposition process has been examined. In addition, the works of cohesion and adhesion between different interacting bodies involved in the deposition process have been determined. The results revealed that AB interactions played an essential role in the inhibition of asphaltene deposition by reducing the propensity of asphaltene toward the dolomite surface. The total interaction energy also showed that the presence of HDES would take the interaction energy of asphaltene-dolomite from attraction toward the repulsive state as much as 125%. Furthermore, the calculated works of cohesion/adhesion proved that the addition of HDES to the model oil could retard asphaltene particles’ cohesion, thus preventing them from aggregation and subsequent deposition onto the dolomite surface. It was also shown that HDES, dissolved in the model oil, would primarily be attracted by asphaltene rather than its own molecules, hence producing HDES-asphaltene conjugates in the medium. Finally, the lower affinity of asphaltenes toward the dolomite surface in the presence of HDES was confirmed using the work of adhesion. The theoretical approach, proposed in this study, can provide a guideline to evaluate the intermolecular interactions between interacting bodies during the asphaltene deposition process, including asphaltene, inhibitor, reservoir rock, and oleic medium.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

et al. 2021

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“…Surfactants are considered as a promising type of chemical inhibitors for asphaltenes in the literature. − Although controversial behaviors have been noticed for some ionic surfactant inhibitors such as dodecyl benzenesulfonic acid (DBSA) , and salicylic acid, nonionic surfactants such as phenols are an efficient and economical category of surfactants. Octylphenol (OP), nonylphenol, and ethoxylated nonylphenol are usually considered as effective asphaltene inhibitors based on inhibitor screening. ,,,− Although phenols are recognized as proper surfactants in terms of inhibition efficiency and economic prospect, they are not generally used as pure due to various technical and nontechnical aspects, and usually they will be mixed with asphaltene solvents and diesel to be used in industrial/field scale . For instance, they are used with solvents as dispersive media that facilitate the mass transfer to the oil phase due to a reduction in the viscosity. , Another reason is that using a concentrated surfactant is prone to forming micelles that can be easily lost in the reservoir (through adsorption) without reaching the oil phase.…”

Section: Introductionmentioning

confidence: 99%

New Molecular Insights into Aggregation of Pure and Mixed Asphaltenes in the Presence of n-Octylphenol Inhibitor

2020

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Asphaltene stability can be perturbed during the oil production and transportation, leading to asphaltene precipitation and deposition. Chemical inhibitors are usually added to the oil phase to postpone asphaltene deposition. The chemical bonding between asphaltene and inhibitor molecules, and the steric hindrance are the key mechanisms of aggregation inhibition. Nevertheless, the interaction mechanisms between asphaltenes and chemical inhibitors still need more research investigations. In this paper, we use an advanced computational chemistry tool, molecular dynamics (MD), to analyze the inhibitory effect of noctylphenol (OP) on three different asphaltene structures at 1 bar and 300 K. To meet the objectives, the asphaltene aggregation and aggregate characterization in both cases of pure and mixed asphaltenes are studied. It is concluded that the archipelago asphaltene (A1) does not aggregate appreciably in the absence of OP; nevertheless, OP reduces the aggregation. The addition of OP is more effective in reducing the aggregation rate for the continental asphaltene, containing hydroxyl and pyridine groups (A2), which is due to the formation of strong hydrogen bonds between the asphaltene and OP, compared to the aromatic stacking between asphaltene and asphaltene. The presence of hydrogen bonds significantly changes the characteristics of aggregates in both scenarios: in the absence and presence of OP. Hence, OP exhibits less efficiency for the continental asphaltene case without hydrogen bond potential (A3). For the mixed asphaltene systems, OP considerably lowers the aggregation rate when A2 and A3 are simultaneously present; the higher relative portion of OP to A2 is the main reason for this behavior. This study reveals that the OP can be an effective inhibitor, depending on the distribution of different types of asphaltenes in the crude oil. The same strategy can be used to screen proper inhibitors or inhibitor mixtures for various types of asphaltenes.

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“…Many studies have presented the AR methods and asphaltene problems in the petroleum and petrochemical industry. One of the useful methods for removal of asphaltene is to apply chemical additives such as solvents (Chen et al 2012), surfactants (Kashefi et al 2016b), polymers (Kashefi et al 2016a), nanoparticles (Mohammadi et al 2019a) and adsorbents (Mohammadi et al 2014).…”

Section: Introductionmentioning

confidence: 99%

The Nexus between Stock Returns of Oil Companies and Oil Price Fluctuations after Heavy Oil Upgrading: Toward Theoretical Progress

et al. 2019

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This study attempts to discover the nexus between crude oil price fluctuation after heavy oil upgrading and stock returns of petroleum companies in the U.S. Stock Exchange for the years 2008 to 2018. One of the methods of upgrading heavy crude oil is to extract asphaltene from crude oil. Considering the Asphaltene Removal (AR) as a factor in the nexus between oil price and the stock market is an innovation in the literature of energy finance. Asphaltenes cause many problems in the petroleum industry, which increases the cost of oil production and reduces the financial efficiency of oil companies. The AR is certainly one of the significant matters of the oil industry and can affect the price of oil. Therefore, changes in the price of oil can influence the price of oil company stocks. Hence, changes in stock prices will certainly affect the stock returns of oil companies. In an effort to solve this puzzle, the four financial models were employed to explore the nexus between oil price fluctuations and stock returns. The analysis of the results demonstrated that the oil price fluctuations caused by the removal of asphaltenes influence the stock returns of petroleum companies. Eventually, the theoretical hypothesis was confirmed by considering the USA as a case study. The outcomes of this investigation are a theoretical progression in areas related to the petroleum industry and the stock market that could lead to the adoption of new investment policies in the petroleum industry including investing in new procedures to manage and decrease the costs and time of the AR process, which would result in the advancement of petroleum companies. In fact, we have introduced a modern investment strategy in the oil industry aimed at reducing oil production costs, improving financial statements and increasing the stock returns of petroleum companies. Eventually, we will present new investment policies in the oil industry that can lead to economic growth and development of financial markets especially stock market, derivatives market, futures exchange, commodities exchange, as well as bond market.

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Investigation of the performance of several chemical additives on inhibition of asphaltene precipitation

Cited by 26 publications

References 21 publications

Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

New Molecular Insights into Aggregation of Pure and Mixed Asphaltenes in the Presence of n-Octylphenol Inhibitor

The Nexus between Stock Returns of Oil Companies and Oil Price Fluctuations after Heavy Oil Upgrading: Toward Theoretical Progress

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