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Journal articles on the topic 'Asphaltene'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Lin, Qunchao, Lei Deng, Ge Dong, et al. "aRDG Analysis of Asphaltene Molecular Viscosity and Molecular Interaction Based on Non-Equilibrium Molecular Dynamics Simulation." Materials 15, no. 24 (2022): 8771. http://dx.doi.org/10.3390/ma15248771.

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Understanding the noncovalent (weak) interactions between asphaltene molecules is crucial to further comprehending the viscosity and aggregation behavior of asphaltenes. In the past, intermolecular interactions were characterized indirectly by calculating the radial distribution function and the numerical distribution of distances/angles between atoms, which are far less intuitive than the average reduced density gradient (aRDG) method. This study selected three representative asphaltene molecules (AsphalteneO, AsphalteneT, and AsphalteneY) to investigate the relationship between viscosity and

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2

Johnston, Robert J., and Thomas G. Mason. "Asphaltene Aggregation Kinetics in Crude Oil Using Confocal Microscopy." Microscopy and Microanalysis 7, S2 (2001): 542–43. http://dx.doi.org/10.1017/s1431927600028786.

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Confocal laser scanning microscopy (CLSM) has been used to study asphaltene aggregation kinetics by employing the microscope's automated acquisition to generate time-lapsed projection maps of aggregating asphaltenes in the autofluorescent matrix of crude oil. Heavy crude oils contain asphaltene particles resulting in the production of optically observable micron-sized asphaltene aggregates. These aggregates form as a result of attractive interactions induced by mixing the heavy crude oil with a poor solvent. This technique has been employed to determine the volume fraction of aggregated asphal

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3

Johnston, Robert J., and Thomas G. Mason. "Asphaltene Aggregation Studies of Crude Oil Using 3-D Confocal Microscopy." Microscopy and Microanalysis 6, S2 (2000): 22–23. http://dx.doi.org/10.1017/s1431927600032608.

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Confocal laser scanning microscopy (CLSM) has been used to generate three dimensional projection maps of less fluorescent domains caused by asphaltene aggregates in the autofluorescent matrix of crude oil. Heavy crude oils contain asphaltene particles resulting in the production of optically observable micron sized asphaltene aggregates. This technique has been employed to determine the volume fraction of aggregated asphaltenes, øagg, and the time evolution of this phenomenon. The measurements cover a range of various concentrations of asphaltene volume fractions of the heavy asphaltenic oil,

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4

Leontaritis, Kosta J. "Asphaltene Near-well-bore Formation Damage Modeling." Journal of Energy Resources Technology 127, no. 3 (2005): 191–200. http://dx.doi.org/10.1115/1.1937416.

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When during oil production the thermodynamic conditions within the near-well-bore formation lie inside the asphaltene deposition envelope of the reservoir fluid, the flocculated asphaltenes cause formation damage. Mathematically, formation damage is a reduction in the hydrocarbon effective mobility, λ, λ=ko∕μo=kkro∕μo. Three possible mechanisms of asphaltene-induced formation damage have been discussed in the literature. Asphaltenes can reduce the hydrocarbon effective mobility by a) blocking pore throats thus reducing the rock permeability, k, b) adsorbing onto the rock and altering the forma

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5

Mullins, Oliver C. "Review of the Molecular Structure and Aggregation of Asphaltenes and Petroleomics." SPE Journal 13, no. 01 (2008): 48–57. http://dx.doi.org/10.2118/95801-pa.

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Summary Tremendous strides have been made recently in asphaltene science. Many advanced analytical techniques have been applied recently to asphaltenes, elucidating many asphaltene properties. The inability of certain techniques to provide correct asphaltene parameters has also been clarified. Longstanding controversies have been resolved. For example, molecular structural issues of asphaltenes have been resolved; in particular, asphaltene molecular weight is now known. The primary aggregation threshold has recently been established by a variety of techniques. Characterization of asphaltene in

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6

Sultanov, F. R., Ye Tileuberdi, Ye K. Ongarbayev, et al. "Study of Asphaltene Structure Precipitated from Oil Sands." Eurasian Chemico-Technological Journal 15, no. 1 (2012): 77. http://dx.doi.org/10.18321/ectj143.

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<p>In the paper microscopic structure and physicochemical characteristics of asphaltenes were investigated. Asphaltene was precipitated from natural bitumen of oil sand of Munaily-Mola deposit using organic solvent of petroleum ether. According to results of our work, we found that the largest yield of asphaltens was reached by using the petroleum ether in 40-fold amount in relation to the initial hitch of bitumen. Chemical composition of precipitated asphaltenes aggregates were studied on FT-Infra red spectrometer Spectrum-65 at 450-4000 cm<sup>-1</sup>. At the Infrared spec

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7

Korneev, Dmitry S. "Structural-group composition and colloidal stability of synthetic asphalten-like nitrogen bases." Bulletin of the Tomsk Polytechnic University Geo Assets Engineering 336, no. 2 (2025): 116–25. https://doi.org/10.18799/24131830/2025/2/4660.

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Relevance. The need to establish the selective impact of individual structural parameters and heteroatomic functional groups in the structure of asphaltene molecules on their aggregation in order to develop effective ways to prevent sedimentation in technological equipment at the stages of production, transport and processing of heavy hydrocarbon raw materials. Aim. To establish the impact of the structural group composition, the concentration of basic nitrogen in asphaltene substances on their colloidal stability. Objects. Heavy oil of the Republic of Tatarstan (density at 20°C – 940,0 kg/m3;

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8

Lindt, Kevin, Bulat Gizatullin, Carlos Mattea, and Siegfried Stapf. "Non-Exponential 1H and 2H NMR Relaxation and Self-Diffusion in Asphaltene-Maltene Solutions." Molecules 26, no. 17 (2021): 5218. http://dx.doi.org/10.3390/molecules26175218.

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The distribution of NMR relaxation times and diffusion coefficients in crude oils results from the vast number of different chemical species. In addition, the presence of asphaltenes provides different relaxation environments for the maltenes, generated by steric hindrance in the asphaltene aggregates and possibly by the spatial distribution of radicals. Since the dynamics of the maltenes is further modified by the interactions between maltenes and asphaltenes, these interactions—either through steric hindrances or promoted by aromatic-aromatic interactions—are of particular interest. Here, we

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9

Ismail, Ali I., Ayman M. Atta, Mohamed El-Newehy, and Mohamed E. El-Hefnawy. "Synthesis and Application of New Amphiphilic Asphaltene Ionic Liquid Polymers to Demulsify Arabic Heavy Petroleum Crude Oil Emulsions." Polymers 12, no. 6 (2020): 1273. http://dx.doi.org/10.3390/polym12061273.

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Asphaltenes are heavy petroleum crude oil components which limit the production of petroleum crude oil due to their aggregation and their stabilization for all petroleum crude oil water emulsions. The present study aimed to modify the chemical structures of isolated asphaltenes by converting them into amphiphilic polymers containing ionic liquid moieties (PILs) to demulsify the emulsion and replace the asphaltene layers surrounding the oil or water droplets in petroleum crude oil emulsions. The literature survey indicated that no modification occurred to produce the PILs from the asphaltenes.

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10

Carpenter, Chris. "Data Science Enables Management of Stealth Asphaltene Flow-Assurance Risk." Journal of Petroleum Technology 76, no. 11 (2024): 115–17. http://dx.doi.org/10.2118/1124-0115-jpt.

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_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 216216, “Managing Stealth Asphaltene Flow-Assurance Potential Risk in Gas-Injection Field Based on Data Science Using Over 20-Year Accumulated Data Set,” by Hideharu Yonebayashi, SPE, and Takeshi Hiraiwa, SPE, Japan Oil Development, and Khuloud T. Al Khlaifi, SPE, ADNOC, et al. The paper has not been peer reviewed. _ Gas injection is recognized generally not only to improve oil recovery but also to increase the risk of asphaltene destabilization. The recent discovery of asphaltene deposits in a s

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11

Stratiev, Dicho, Radoslava Nikolova, Anife Veli, Ivelina Shishkova, Vesislava Toteva, and Georgi Georgiev. "Mitigation of Asphaltene Deposit Formation via Chemical Additives: A Review." Processes 13, no. 1 (2025): 141. https://doi.org/10.3390/pr13010141.

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The deposition of asphaltenes in the petroleum industry has been found to be a significant factor affecting the profitability of petroleum production and refining. For this reason, many efforts have been made to clarify the mechanism of deposition formation and to find measures to reduce its harmful impact on the efficiency of oil production and refining. Recent reports on the mechanism of deposit formation by asphaltenes suggest that it is a phase transition phenomenon. Many studies have shown that this process can be slowed by using chemical inhibitors. Different classes of chemical substanc

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12

Goncharov, A. V., and E. B. Krivtsov. "Changes in the Structure of Asphaltene Molecules in the Process of Initiated Cracking of Tars." Химия твердого топлива, no. 2-3 (March 1, 2023): 99–106. http://dx.doi.org/10.31857/s0023117723020056.

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The results of a study of asphaltenes isolated from the liquid products of tar cracking performed at a temperature of 500°C in the presence of didodecanoyl peroxide are presented. The reactions rate constants of the thermal transformations of asphaltenes in the studied tars were calculated. It was found that the reaction rate of asphaltene condensation into solid compaction products depends not only on the initial asphaltene content of tars but also on the molecular structure. Changes in the structural group parameters of tar asphaltenes in the course of initiated cracking were established. It

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13

Guerrero-Martin, Camilo Andrés, Daniel Montes-Pinzon, Mariana Meneses Motta da Silva, et al. "Asphaltene Precipitation/Deposition Estimation and Inhibition through Nanotechnology: A Comprehensive Review." Energies 16, no. 13 (2023): 4859. http://dx.doi.org/10.3390/en16134859.

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Asphaltene precipitation/deposition is considered a problem of formation damage, which can reduce the oil recovery factor. In addition, asphaltenes can be deposited in pipelines and surface installations, causing serious complications in guaranteeing runoff, decreasing the production of oil wells. The precipitation of asphaltenes can be minimized by reducing the oil production flowrate or by using chemical inhibitors. Analyzing the stability and precipitation trend of asphaltenes in petroleum is vital for the guarantee of flow. For this purpose, several experimental and numerical methods have

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14

Hashmi, Sara M., and Abbas Firoozabadi. "Effective Removal of Asphaltene Deposition in Metal-Capillary Tubes." SPE Journal 21, no. 05 (2016): 1747–54. http://dx.doi.org/10.2118/166404-pa.

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Summary We describe asphaltene deposition and removal processes in metal capillaries. We induce asphaltene precipitation by adding an asphaltene precipitant, heptane, to a petroleum fluid. The mixture is then injected through a laboratory-scale capillary and allowed to deposit. We assess the reversal of the deposition by means of the use of two separate chemical treatments: (1) a strong organic acid surfactant and (2) an aromatic solvent. The strong organic acid surfactant, dodecyl benzene sulfonic acid (DBSA), was shown to completely dissolve asphaltenes by means of acid-base chemistry reacti

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15

Sun, Dachuan. "A Simple Scheme for Extraction of Asphaltenes from Asphalt at Room Temperature." Coatings 12, no. 3 (2022): 407. http://dx.doi.org/10.3390/coatings12030407.

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This paper proposes a simple scheme to separate asphaltenes from asphalt at room temperature without heating or refluxing. The proposed scheme can solve the problems of high energy cost, expensive devices, and safety risks of flammable steam in standard methods of asphaltene extraction. First, the asphalt is dissolved in a good solvent to obtain a solution containing asphaltenes, and the inorganic impurity as well as residual carbons are removed by filtration. Then, the solution containing asphaltenes is dropped into poor solvent to let asphaltenes flocculate into suspended solids. Finally, th

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16

Borzdun, Natalia, Artyom Glova, Sergey Larin, and Sergey Lyulin. "Influence of Asphaltene Modification on Structure of P3HT/Asphaltene Blends: Molecular Dynamics Simulations." Nanomaterials 12, no. 16 (2022): 2867. http://dx.doi.org/10.3390/nano12162867.

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Further development and commercialization of bulk heterojunction (BHJ) solar cells require the search for novel low-cost materials. The present study addresses the relations between the asphaltenes’ chemical structure and the morphology of the poly(3-hexylthiohene) (P3HT)/asphaltene blends as potential materials for the design of BHJ solar cells. By means of all-atom molecular dynamics simulations, the formation of heterophase morphology is observed for the P3HT-based blends with carboxyl-containing asphaltenes, as well as the aggregation of the asphaltenes into highly ordered stacks. Although

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17

Li, Xinyuan, Shu Lu, Meifei Niu, Ruzhen Cheng, Yanjun Gong, and Jun Xu. "Asphaltene Inhibition and Flow Improvement of Crude Oil with a High Content of Asphaltene and Wax by Polymers Bearing Ultra-Long Side Chain." Energies 14, no. 24 (2021): 8243. http://dx.doi.org/10.3390/en14248243.

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A high content of asphaltene and wax in crude oil leads to difficulties in the recovery and transportation of crude oil due to the precipitation of asphaltenes and the deposition of waxes. Comb-like polymers were found to be capable of inhibiting the aggregation of asphaltenes and crystallization of waxes. In this work, comb-like bipolymers of α-olefins/ultra-long chain (C18, C22 and C28) alkyl acrylate were synthesized and characterized by FT-IR and 1H NMR spectra. The results show that, for a model oil containing asphaltene, the initial precipitation point (IPP) of asphaltene was prolonged b

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18

Jamaluddin, A. K. M., J. Nighswander, N. Joshi, O. C. Mullins, C. Forde, and P. Barraclough. "ASPHALTENE CHARACTERISATION USING SPECTRAL ANALYSIS SYSTEM." APPEA Journal 44, no. 1 (2004): 617. http://dx.doi.org/10.1071/aj03029.

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Asphaltenes are the heaviest hydrocarbon component of crude oil and remain in colloidal suspension under reservoir temperature and pressure conditions. These materials may flocculate and deposit as a result of pressure, temperature and compositional changes, and consequently, disrupt production operations. This disruption can have severe implications, particularly in an offshore subsea environment. In these circumstances, it is imperative to understand the fundamental behaviour of asphaltenes prior to the development phase of any field under consideration.In this paper, we present a novel meth

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19

Yanyun, Chen, Deng Liangguang, Lu Xiao, Zhao Chunyu, and Wei Zhao. "Evaluation of the effect of asphalt deposition inhibitor for crude oil." Journal of Physics: Conference Series 2430, no. 1 (2023): 012022. http://dx.doi.org/10.1088/1742-6596/2430/1/012022.

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Abstract In this paper, the effect of asphalt deposition inhibitors coal tar, bromohexadecylpyridine and sodium oleate on the viscosity reduction and asphaltene reduction of crude oil was investigated. The results show that coal tar has a better inhibitory effect on asphaltenes in crude oil. The asphaltene reduction effect is the best when the addition amount is 0.5%. Compared with the blank, the asphaltene content is reduced from 24.47% to 9.42%. The cationic surfactant bromohexadecylpyridine and coal tar have a good synergistic effect, and the asphaltene content is reduced by 1.74% compared

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20

Zhao, Fa Jun, Yong Jian Liu, Yi Wu, Yong Si, Bo Zhang, and Hong Rui Wu. "Research on the Asphaltene Structure and Thermal Analysis in Catalytic Aquathermolysis of Heavy Oil." Key Engineering Materials 474-476 (April 2011): 893–97. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.893.

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As an irreversible viscosity reduction way, catalytic aquathermolysis of heavy oil is given close attention by scholars at home and abroad, and a high content of asphaltene in heavy oil is the major cause for the high viscosity of heavy oil. Through the use of IR spectrum and TG-DTA, this paper analyzes the asphaltene structure and thermal analysis before and after the catalytic aquathermolysis reaction, and the result shows some changes in the heavy component structure in the asphaltene after the reaction, a reduction in some unsaturated structures, an increase in saturated structures, a redu

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21

Kuzmenko, Oleg S., Mihail G. Kulkov, Yuri V. Korzhov, and Sergey V. Nekhoroshev. "The study of the effect of precipitating n-hexane in the oil asphaltenes West Salym." Yugra State University Bulletin 12, no. 3 (2016): 26–34. http://dx.doi.org/10.17816/byusu201612326-34.

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The oil is co-featured bout dispersion and by influencing the nature of mutually-interacting between the parish-contact, resins and asphaltene-mi, it becomes possible to control the processes of structure-turoobrazovaniya in the oil system. Therefore, for the rose-ciency technologies extraction of residual oil using carbon-hydrogen solvent was conducted to study the pro-asphaltene precipitation process oil with an increase in its concentration of n-hexane. As a result of experiments, it was found that pro-process asphaltene precipitation with n-hexane from the oil West but Salymmestorozhde-tio

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22

Zhang, Yan Xing, Xiang Fang Li, and Jia Li. "Asphaltene Deposition Forecasting Methods." Advanced Materials Research 616-618 (December 2012): 789–95. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.789.

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Asphaltene deposition problems occurred in many oil fields in worldwide, which maybe block up wellbore, damage the permeability of reservoir and decline oil productivity. There are many factors to result asphalthene deposition problems, which contain crude component, pressure, temperature and so on. However, it cannot prevent asphaltene deposition problems completely by keeping formation pressure higher than bubble pressure based on the research. Studying the deposition affecting factors, determining the deposition occurring conditions and depth are the basis to resolve the problems. This pape

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23

Mohammadzadeh, Omid, Shawn David Taylor, Dmitry Eskin, and John Ratulowski. "Experimental Investigation of Asphaltene-Induced Formation Damage Caused by Pressure Depletion of Live Reservoir Fluids in Porous Media." SPE Journal 24, no. 01 (2018): 01–20. http://dx.doi.org/10.2118/187053-pa.

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Summary One of the complex processes of permeability impairment in porous media, especially in the near-wellbore region, is asphaltene-induced formation damage. During production, asphaltene particles precipitate out of the bulk fluid phase because of pressure drop, which might result in permeability reduction caused by both deposition of asphaltene nanoparticles on porous-medium surfaces and clogging of pore throats by larger asphaltene agglomerates. Experimental data will be used to identify the parameters of an impairment model being developed. As part of a larger effort to identify key mec

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24

Zheng, Fang, Quan Shi, Germain Salvato Vallverdu, Pierre Giusti, and Brice Bouyssiere. "Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics." Processes 8, no. 11 (2020): 1504. http://dx.doi.org/10.3390/pr8111504.

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Asphaltenes, as the heaviest and most polar fraction of petroleum, have been characterized by various analytical techniques. A variety of fractionation methods have been carried out to separate asphaltenes into multiple subfractions for further investigation, and some of them have important reference significance. The goal of the current review article is to offer insight into the multitudinous analytical techniques and fractionation methods of asphaltene analysis, following an introduction with regard to the morphologies of metals and heteroatoms in asphaltenes, as well their functions on asp

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25

Pei, Xinyan, Hongyu Tian, and William L. Roberts. "Swirling Flame Combustion of Heavy Fuel Oil Blended with Diesel: Effect of Asphaltene Concentration." Energies 15, no. 17 (2022): 6156. http://dx.doi.org/10.3390/en15176156.

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Heavy fuel oil has an energy density content comparable to distillate fuels but a very high viscosity that necessitates extra heating before spray combustion inside a boiler. Heavy fuel oil is also characterized by high asphaltenes, carbon residues, trace metals, such as vanadium and nickel, fuel-bound nitrogen, and sulfur. Asphaltenes are heavy polycyclic aromatic compounds with embedded heteroatoms and significantly affect the physico-chemical properties of heavy fuels; this makes them very difficult to burn and leads to the formation of large cenospheres (lightweight, inert, hollow spheres)

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Kar, Taniya, Khosrow Naderi, and Abbas Firoozabadi. "Asphaltene Deposition and Removal in Flowlines and Mitigation by Effective Functional Molecules." SPE Journal 25, no. 02 (2020): 771–87. http://dx.doi.org/10.2118/199878-pa.

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Summary Efficient removal of deposited asphaltenes on the surface of metallic flowlines by functional molecules is investigated by nonionic and ionic surfactants at low concentrations. Deposition removal by aromatic solvent toluene is measured as a reference. Water is often coproduced with crude oil and may affect deposition of asphaltenes and removal. In this study, we investigate the effect of water in both asphaltene deposition and removal by functional molecules. Two different crudes from different fields that give rise to serious asphaltene deposition are extensively investigated. For the

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27

Grin’ko, A. A., L. V. Ivanova, E. V. Frantsina, et al. "Plasma Processing of Light- and Heavy-Oil Asphaltenes." Химия высоких энергий 57, no. 3 (2023): 238–52. http://dx.doi.org/10.31857/s002311932303004x.

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The paper presents an analysis of the results of an experimental study of carbon materials obtained in a direct-current arc plasma from asphaltenes isolated from light oil of the Sredneugutskoye field and combined heavy oil from Venezuelan fields, as well as asphaltenes isolated from natural asphaltite. The influence of the composition of initial asphaltenes on the composition and properties of carbon materials obtained as a result of plasma treatment has been studied. The parent asphaltenes and carbon materials synthesized from them have been examined using a set of instrumental methods: X-ra

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28

Nguyen, Ngoc Thuy, Ki Hyuk Kang, Pill Won Seo, et al. "Hydrocracking of C5-Isolated Asphaltene and Its Fractions in Batch and Semi-Batch Reactors." Energies 13, no. 17 (2020): 4444. http://dx.doi.org/10.3390/en13174444.

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Non-catalytic and catalytic hydrocracking of C5-isolated asphaltene and its subfractions were performed in batch and semi-batch reactors at various temperatures. Catalyst and H2 played an important role in the hydrocracking of asphaltenes. In the batch system, the catalyst enhanced asphaltene conversion to light liquid products and suppressed coke formation. The coke formation was controlled at a low reaction temperature, but the reaction rate was too low. Light liquid products were also formed at the beginning of the reaction even at high temperatures, but the coke formation was predominant a

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29

Mamedov, T., and A. Yusif-zade. "SEPARATION OF TARS AND ASPHALTENES FROM TARS OF AZERBAIJAN OILS." Scientific heritage, no. 101 (November 21, 2022): 15–17. https://doi.org/10.5281/zenodo.7340719.

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This research is devoted to studying the elemental composition and yield of asphaltene and resin fractions from Azerbaijan oils processed at the Heydar Aliyev Baku Oil Refinery. Acetone was proposed as a solvent, IR spectra for resins and asphaltenes were taken, and the structural group composition was given according to IR spectra. Asphaltene molecules contain polycyclic rings with aromatic cycles and S, O, N heteroatoms and metals. We have shown that the settled asphaltenes were divided into two fractions, which differ in elemental composition and IR spectroscopy.

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Elturki, Mukhtar, and Abdulmohsin Imqam. "Asphaltene Thermodynamic Precipitation during Miscible Nitrogen Gas Injection." SPE Journal 27, no. 01 (2021): 877–94. http://dx.doi.org/10.2118/208588-pa.

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Summary For many years, miscible gas injection has been the most beneficial enhanced oil recovery method in the oil and gas industry. However, injecting a miscible gas to displace oil often causes the flocculation and deposition of asphaltenes, which subsequently leads to a number of production problems. Nitrogen gas (N2) injection has been used to enhance oil recovery in some oil fields, seeking to improve oil recovery. However, few works have implemented N2 injection and investigated its effect on asphaltene precipitation and deposition. This research investigated the N2 miscible flow mechan

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GERASIMOVA, N. N., R. S. MIN, and T. A. SAGACHENKO. "CHARACTERISTICS OF STRUCTURAL FRAGMENTS LINKED VIA SULPHIDE BRIDGES IN THE PRODUCTS FORMED IN THE CONVERSION OF ASPHALTENES OF HEAVY OILS IN SUPERCRITICAL HEXANE." Chemistry for Sustainable Development 33, no. 2 (2025): 180–89. https://doi.org/10.15372/csd2025643.

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The composition of fragments linked by sulphide bridges in the molecules of resin-asphaltene substances isolated from the liquid products of thermal destruction of asphaltene components of heavy high-sulphur oils from the Usinskoye and Ashalchinskoye fields in supercritical n-hexane is investigated using a complex of physicochemical methods (selective chemical degradation, IR spectroscopy, gas chromatography - mass spectrometry). The set of compounds identified in the products of C-S bond cleavage in the molecules of secondary asphaltenes and resins is largely identical to that identified in t

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32

Zhu, Jie, Ganyu Xia, Dejian Shen, Yangtao Li, Baosheng Jin, and Shengxing Wu. "Selection of Representative Asphaltene Molecules in an Asphalt Molecular Model Based on Quantum Chemistry and Statistical Analysis." Molecules 29, no. 24 (2024): 6015. https://doi.org/10.3390/molecules29246015.

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Asphaltenes, as the most complex and strongly polar component among the four components of asphalt, have a significant impact on the macroscopic physicochemical properties of asphalt. Currently, the vast variety of molecular structures used to characterize asphaltenes increases the construction complexity of asphalt molecular models. To construct a more realistic asphalt molecular model and reduce the construction difficulty, this investigation obtains the molecular morphology, molecular polarity, and infrared spectrum indicators of 21 asphaltene molecules through quantum chemical calculations

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33

Ahmadi, Mohammadali, and Zhangxin Chen. "Molecular Interactions between Asphaltene and Surfactants in a Hydrocarbon Solvent: Application to Asphaltene Dispersion." Symmetry 12, no. 11 (2020): 1767. http://dx.doi.org/10.3390/sym12111767.

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Heavy oil and bitumen supply the vast majority of energy resources in Canada. Different methods can be implemented to produce oil from such unconventional resources. Surfactants are employed as an additive to water/steam to improve an injected fluid’s effectiveness and enhance oil recovery. One of the main fractions in bitumen is asphaltene, which is a non-symmetrical molecule. Studies of interactions between surfactants, anionic, and non-anionic, and asphaltene have been very limited in the literature. In this paper, we employed molecular dynamics (MD) simulation to theoretically focus on the

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34

Peng, Yan, Xiangyu Zhang, Lihua Cheng, et al. "Effect of Asphaltenes on the Stability of Water in Crude Oil Emulsions." Materials 18, no. 3 (2025): 630. https://doi.org/10.3390/ma18030630.

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The presence of asphaltene, especially in heavy crude oil, causes difficulties in the de-watering/desalting process, which is the initial step of crude oil pretreatment. This study investigates the effect of asphaltenes on the stability of crude oil emulsions using a simulated oil system composed of toluene and n-heptane. It was found that asphaltenes behave like conventional surfactants, adsorbing at the oil–water interface and reducing interfacial tension. The critical aggregation concentration (CAC) of W/O emulsions formed from a toluene and n-heptane mixture (7:3 volume ratio) was found to

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35

Ostapenko, Darya V., Tatiana V. Cheshkova, Tatiana A. Sagachenko, and Raisa S. Min. "STRUCTURAL ORGANIZATION OF ASPHALTENES OF NAPHTHENIC AND AROMATIC TYPES OF OILS." ChemChemTech 68, no. 8 (2025): 92–100. https://doi.org/10.6060/ivkkt.20256808.10t.

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The products of oxidative degradation of asphaltenes from naphthenic and aromatic oils from the Russian and Novoportovskoye fields, respectively, using hydrogen peroxide in the presence of acetic acid, were studied. It was found that naphthenic asphaltene contains twice as many oxidized compounds as aromatic asphaltene. According to infrared spectroscopy data, both types of asphaltenes have aliphatic, aromatic, and oxygen-containing groups in their structures. Compounds associated with naphthenic oils have a higher proportion of aromatic structures, while compounds associated with aromatic oil

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Xiang, Chaoyue, Yangwen Zhu, Guanghao Liu, Tao Liu, Xinru Xu, and Jingyi Yang. "Experimental and Simulation Studies of Imidazolium Chloride Ionic Liquids with Different Alkyl Chain Lengths for Viscosity Reductions in Heavy Crude Oil: The Effect on Asphaltene Dispersion." Molecules 29, no. 5 (2024): 1184. http://dx.doi.org/10.3390/molecules29051184.

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Heavy crude oil poses challenges in terms of extraction and transportation due to its high viscosity. In the pursuit of effective methods to reduce viscosity in heavy crude oil, this study investigates the potential of imidazolium chloride ionic liquids with varying alkyl chain lengths as viscosity reducers. The experimental results demonstrate that the addition of 1-dodecyl-3-methylimidazole chloride ([C12-MIM]Cl) leads to a maximum viscosity reduction of 49.87%. Solubility parameters were calculated based on characterization of the average molecular structure of the asphaltenes. The viscosit

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Mahtar, Ariff, Aliyu Adebayo Sulaimon, and Cecilia Devi Wilfred. "Lignosulfonate-Based Ionic Liquids as Asphaltene Dispersants." Molecules 28, no. 8 (2023): 3390. http://dx.doi.org/10.3390/molecules28083390.

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Asphaltenes are recognized as being troublesome from upstream to downstream in the oil industry due to their tendency to precipitate and self-associate. Their extraction from asphaltenic crude oil for a cost-effective refining process is a crucial and critical challenge in the oil and gas sector. Lignosulfonate (LS), as a by-product of the wood pulping process in the papermaking industry, is a highly available and underutilized feedstock. This study aimed to synthesize novel LS-based ionic liquids (ILs) by reacting lignosulfonate acid sodium salt [Na]2[LS] with different alkyl chains of piperi

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Fakher, Sherif, Mohamed Ahdaya, Mukhtar Elturki, and Abdulmohsin Imqam. "An experimental investigation of asphaltene stability in heavy crude oil during carbon dioxide injection." Journal of Petroleum Exploration and Production Technology 10, no. 3 (2019): 919–31. http://dx.doi.org/10.1007/s13202-019-00782-7.

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Abstract Carbon dioxide (CO2) injection is one of the most applied enhanced oil recovery methods in the hydrocarbon industry, since it has the potential to increase oil recovery significantly and can help reduce greenhouse gases through carbon storage in hydrocarbon reservoirs. Carbon dioxide injection has a severe drawback, however, since it induces asphaltene precipitation by disrupting the asphaltene stability in crude oil that bears even the slightest asphaltene concentration. This can result in severe operational problems, such as reservoir pore plugging and wellbore plugging. This resear

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Gafurov, Marat, Georgy Mamin, Irina Gracheva, et al. "High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface." Geofluids 2019 (May 16, 2019): 1–9. http://dx.doi.org/10.1155/2019/3812875.

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Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films obtained as a result of adsorption on the surface of aluminum oxide were studied by electron paramagnetic resonance (EPR) and double electron-nuclear resonance (ENDOR) in the W-band frequency range (microwave frequency of 95 GHz, magnetic field of 3.4 T). Mims ENDOR spectra from 1H and 27Al nuclei are observed. ENDOR spectra are different for native oil and asphaltenes from one side and the adsorbed samples from the other side while no significant changes in X- (microwave frequency of 9 GHz) or W-

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Nava, Andreina, Narciso Pérez, Alejandra Meza, José Velásquez, and Gladys Rincón. "EFFECT OF RESIN AND ASPHALTENE CONTENT PRESENT ON THE VACUUM RESIDUE ON THE YIELD OF DELAYED COKING PRODUCTS." Rev. LatinAm. Metal. Mat. 39, no. 1 (2019): 49–58. https://doi.org/10.5281/zenodo.7693790.

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The effect of resin and asphaltene concentration in the feed, on the yield of delayed coking products was assessed, feeding controlled concentrations of the groups: saturates, aromatics, resins and asphaltenes (SARA) (50-100%w/w of asphaltene or resin and a fixed mass ratio of the others groups) prepared from a Venezuelan vacuum residue. The results of yield of products obtained in a laboratory-scale process show, that the increases of concentration of resins or asphaltenes raise yield of coke and decreasesthe not-condensable. The distillates yield remained at levels close to zero (<1%w/w)

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Ali, Ali A., Ghassan Hameed Abdul-Majeed, and Abdalellah O. Mohmmed. "Modeling of asphaltene precipitation - part I: comparative study for asphaltene precipitation envelope prediction methods." Iraqi Journal of Chemical and Petroleum Engineering 25, no. 4 (2024): 1–14. https://doi.org/10.31699/ijcpe.2024.4.1.

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The solubility of asphaltenes in crude oils is predominantly influenced by variations in temperature, pressure, and oil composition. These alterations can precipitate asphaltene deposition, resulting in diminished permeability, obstruction of wells and auxiliary surface facilities, and ultimately, a reduction or cessation of production. Therefore, it is imperative for upstream and downstream processing engineers to comprehend and predict asphaltene phase behavior to implement effective preventative and remedial strategies and minimize costs. Asphaltene precipitation can be predicted through th

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Wang, Peng, Fenglan Zhao, Jirui Hou, Guoyong Lu, Meng Zhang, and Zhixing Wang. "Comparative Analysis of CO2, N2, and Gas Mixture Injection on Asphaltene Deposition Pressure in Reservoir Conditions." Energies 11, no. 9 (2018): 2483. http://dx.doi.org/10.3390/en11092483.

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CO2 and N2 injection is an effective enhanced oil recovery technology in the oilfield especially for low-permeability and extra low-permeability reservoirs. However, these processes can induce an asphaltene deposition during oil production. Asphaltene-deposition-induced formation damage is a fairly severe problem. Therefore, predicting the likelihood of asphaltene deposition in reservoir conditions is crucial. This paper presents the results of flash separation experiments used to investigate the composition of crude oil in shallow and buried-hill reservoirs. Then, PVTsim Nova is used to simul

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Wang, Shaojun, and Faruk Civan. "Modeling Formation Damage by Asphaltene Deposition During Primary Oil Recovery." Journal of Energy Resources Technology 127, no. 4 (2005): 310–17. http://dx.doi.org/10.1115/1.1924465.

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Asphaltene precipitation and deposition during primary oil recovery and resulting reservoir formation damage are described by a phenomenological mathematical model. This model is applied using experimental data from laboratory core flow tests. The effect of asphaltene deposition on porosity, permeability, and the productivity of vertical wells in asphaltenic-oil reservoirs are investigated by simulation.

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Sadovnikova, Margarita A., Fadis F. Murzakhanov, Georgy V. Mamin, and Marat R. Gafurov. "HYSCORE Spectroscopy to Resolve Electron–Nuclear Structure of Vanadyl Porphyrins in Asphaltenes from the Athabasca Oil Sands In Situ Conditions." Energies 15, no. 17 (2022): 6204. http://dx.doi.org/10.3390/en15176204.

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The purpose of this work is to analyze the electron–nuclear interactions of the vanadyl-porphyrin (VP) complexes in oil asphaltenes. Asphaltenes from the Athabasca oil sands were studied by HYperfine Sublevel CORrelation Spectroscopy (HYSCORE) electron paramagnetic resonance (EPR). It makes it possible to resolve and interpret complex hyperfine spectra of intrinsic VP with strong and weak hyperfine interactions between the electron magnetic moment and various nuclear spins (1H, 14N, 51V). The main parameters of spin-Hamiltonian for the VP spin system are determined. The axially symmetric struc

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A. Ahmed, Moammed, Ghassan H. Abdul-Majeed, and Ali K. Alhuraishawy. "Asphaltene Precipitation Investigation Using a Screening Techniques for Crude Oil Sample from the Nahr-Umr Formation/Halfaya Oil Field." Iraqi Journal of Chemical and Petroleum Engineering 24, no. 1 (2023): 41–50. http://dx.doi.org/10.31699/ijcpe.2023.1.6.

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Many oil and gas processes, including oil recovery, oil transportation, and petroleum processing, are negatively impacted by the precipitation and deposition of asphaltene. Screening methods for determining the stability of asphaltenes in crude oil have been developed due to the high cost of remediating asphaltene deposition in crude oil production and processing. The colloidal instability index, the Asphaltene-resin ratio, the De Boer plot, and the modified colloidal instability index were used to predict the stability of asphaltene in crude oil in this study. The screening approaches were in

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Parlov Vuković, Jelena, Predrag Novak, and Tomislav Jednačak. "NMR Spectroscopy as a Tool for Studying Asphaltene Composition." Croatica chemica acta 92, no. 3 (2019): 323–29. http://dx.doi.org/10.5562/cca3543.

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Asphaltenes are the most polar oil components with molecular weights between 500 and 1000 Da, which primarily consist of carbons and hydrogens, some heteroatoms, such as nitrogen, sulphur, oxygen and traces of nickel, vanadium and iron. Owing to their extreme complexity, it is almost impossible to completely identify all the compounds present in asphaltene samples. Various analytical techniques and approaches were used to characterize asphaltenes but their structure and composition are still a matter of thorough investigations. NMR spectroscopy can reveal useful information on asphaltene molec

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M’barki, Oualid, John Clements, and Quoc P. Nguyen. "Effect of Asphaltenes and Asphaltene Dispersants on Wax Precipitation and Treatment." Colloids and Interfaces 8, no. 3 (2024): 30. http://dx.doi.org/10.3390/colloids8030030.

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A detailed understanding of the interactions between wax and asphaltenes with other components of crude oils and the effect of treatments with paraffin inhibitors (PIs) and asphaltene dispersants (ADs), with a focus on identifying specific structure-activity relationships, is necessary to develop effective flow assurance strategies. The morphological and rheological consequences of treating wax and asphaltenes in oils of differing composition with a series of ADs having structural features in common with an alpha olefin-maleic anhydride (AO-MA) comb-like copolymer PI were assessed alone and in

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Tabzar, Amir, Mohammad Fathinasab, Afshin Salehi, Babak Bahrami, and Amir H. Mohammadi. "Multiphase flow modeling of asphaltene precipitation and deposition." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 73 (2018): 51. http://dx.doi.org/10.2516/ogst/2018039.

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Asphaltene precipitation in reservoirs during production and Enhanced Oil Recovery (EOR) can cause serious problems that lead to reduction of reservoir fluid production. In order to study asphaltene tendency to precipitate and change in flow rate as a function of distance from wellbore, an equation of state (Peng-Robinson) based model namely Nghiem et al.’s model has been employed in this study. The heaviest components of crude oil are separated into two parts: The first portion is considered as non-precipitating component (C31A+) and the second one is considered as precipitating component (C3

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Voloshin, A. I., M. G. Volkov, and V. A. Dokichev. "TECHNOLOGICAL COMPLICATIONS (FORMATION DAMAGE) DURING CO2 INJECTION FOR ENHANCED OIL RECOVERY. PART 3. PREVENTING AND REPAIRING FORMATION DAMAGE CAUSED BY CO2 INJECTION." Problems of Gathering Treatment and Transportation of Oil and Oil Products, no. 5 (November 8, 2024): 67–78. http://dx.doi.org/10.17122/ntj-oil-2024-5-67-78.

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The article considers technological complications arising during CO2 injection for enhanced oil recovery, with a focus on the formation of asphaltenes in the pore space and their negative impact on production efficiency. Formation of asphaltene solids in the reservoir leads to an increase in the skin factor, their removal to the wells, accumulation in the wellbore and on the surface of the equipment, which reduces oil flow to the well and requires expensive remedial work. Methods of identification and monitoring of asphaltene deposits are considered. Results of laboratory studies confirming th

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Voloshin, A. I., M. G. Volkov, and V. A. Dokichev. "TECHNOLOGICAL COMPLICATIONS (FORMATION DAMAGE) DURING CO2 INJECTION FOR ENHANCED OIL RECOVERY. Part 2. INTERACTION OF CO2 WITH FORMATION OIL: WETTABILITY CHANGE, ASPHALTENE PRECIPITATION AND DEPOSITION IN THE FORMATION." Problems of Gathering Treatment and Transportation of Oil and Oil Products, no. 4 (September 3, 2024): 74–95. http://dx.doi.org/10.17122/ntj-oil-2024-4-74-95.

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In the second part of the review (the first part was published in [1]) the processes of formation damage at CO2 injection due to the oil phase stability disturbance are considered. Changes in reservoir temperature, pressure or fluid composition due to CO2 dissolution can provoke asphaltene precipitation and deposition. Their adsorption on the reservoir pore surface leads to a change in decrease in rock permeability. The currently ac wettability and a cepted numerical models describe well the experimental results on colmatation of pore media by asphaltenes in the presence of CO2, with different

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