Some Compositional Viscosity Correlations for Crude Oils from Russia and Norway

Malkin, A. Ya.; Rodionova, G. N.; Simon, Sébastien; Ilyin, Sergey O.; Arinina, M. P.; Куличихин, В. Г.; Sjöblom, Johan

doi:10.1021/acs.energyfuels.6b02084

Cited by 44 publications

(31 citation statements)

References 28 publications

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“…30 Applications of many sophisticated methods for the evaluation of asphaltenes (such as time-resolved fluorescence depolarization, laser ionization mass spectrometry, AFM, and STM) have reduced the chemical uncertainties substantially, 17 but contradictory conclusions may be presented for understanding the relationship between the compositions and apparent properties of heavy crude oil. Researchers have established a general correlation of viscosity increase along with increasing asphaltene, resin, and aromatics concentrations and a decrease in viscosity with increasing saturate concentration, 31 but another article mentioned that resins "mitigated" the influence of asphaltenes, facilitating the disaggregation and stabilizing of the system as a whole. 32 Keep in mind, the concept of asphaltenes and resins are not definite, which depends on the method of determining their concentration.…”

Section: ■ Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Zhu

Zhang

et al. 2021

Energy Fuels

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Heavy oil, with high viscosity and complex compositions, often faces a series of challenges in the process of its exploitation and utilization. There are huge amounts of compositions with different molecular structures in heavy oil, and it is a great challenge to clarify the influence of the microstructure of heavy oil on the rheological and viscosity–temperature properties. Based on the experimental data, such as acid value, element content, functional group type of the heavy oil, and so on, we constructed six types of heavy oils from three regions to reveal the unique properties of Karamay heavy oil. Molecular dynamics simulation was used to study the effects of the compositions and the aggregation structure on the rheological and viscosity–temperature properties of heavy oil. The results show that the rheological properties of Karamay heavy oil with low asphaltene concentration are dominated by molecular conformation, and heavy oil with molecules that are not easily stretched has a higher viscosity. When the concentration of asphaltene is high, the nanoaggregates formed by asphaltene molecules and their variation with shear rate affect the viscosity. Compared with the aggregates by the island structure asphaltene molecules, the larger nanoaggregate size of continental structure due to stronger π–π interaction leads to the increase in viscosity. However, the viscosity decreases faster with the increase in shear rate, which is attributed to the more orderly aggregate structure of polycondensed aromatic rings that can be easily pulled along the velocity plane. In addition, we found that metal ions, as a bridge, can interact with molecules containing different heteroatoms, forming larger clusters and increasing the viscosity of Karamay heavy oil. For the viscosity–temperature properties, the more intense thermal movement of molecules with the increased temperature weakens the interaction between the aromatic rings and decreases the viscosity of heavy oils.

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Section: ■ Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Zhu

Zhang

et al. 2021

Energy Fuels

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“…A simple way to reduce heavy crude oil transportation costs is removing of heavy components from it, namely asphaltenes, [ 41 ] which contribute significantly to the high viscosity of these oils. [ 42,43 ] Thereby, there is the problem of rationally utilization of asphaltenes generated after oil deasphalting. It seems that the best way to solve this environmental problem is to give the asphaltenes an added value.…”

Section: Introductionmentioning

confidence: 99%

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Ignatenko

Kostyuk

Смирнова

et al. 2020

Polymer Engineering & Sci

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The use of heavy crude oil asphaltenes and resins (termed asphaltenes) as the components of hot‐melt adhesives based on the styrene‐isoprene triblock copolymer was considered. The rheological, thermophysical, strength, and adhesive characteristics of the mixtures containing from 10 to 40 wt% of asphaltenes were studied. The addition of 10 to 20 wt% of asphaltenes enhanced the strength and adhesive properties of the mixtures and only slightly changed their rheology. The higher concentrations of asphaltenes reduced the viscosity of the mixtures but did not lead to improved characteristics of the adhesives. The ambiguous effect of asphaltenes is probably due to their uneven distribution between the microphases of the block copolymer as well as their ability to act both plasticizers and reinforcing particles depending on temperature. A comparison of asphaltenes and conventional tackifiers based on hydrocarbon resins revealed their comparable effect on the properties of the block copolymer.

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“…6, between the power constant and the ratio Resins (wt%)−0.4×Asphaltenes (wt%) ν , a correlation coefficient of 0.99 was obtained, indicating proportionality between the K r K a and the ratio. Malkin et al showed that the small concentrations of asphaltenes have a dominant influence on the viscosity, while much higher concentrations of resins and aromatics are required in order to cause a significant increase of oil viscosity [32]. Resins contribute to dispersion of asphaltene nanoaggregates, increase the solubility of asphaltenes in oil and decrease the effect of asphaltenes on viscosity through reducing the size of asphaltene aggregates [33][34][35].…”

Section: Resultsmentioning

confidence: 99%

Modeling of surfactant adsorption on coated quartz crystal surfaces during surfactant flooding process

et al. 2020

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The focus of this study was the experimental determination of surfactant adsorption during low salinity water injection combined with surfactant flooding (LSW-SF) into an oil reservoir and development of an analytical model to predict this adsorption. The experimental model used was surfactant adsorption on silica and aluminosilicate coated quartz crystal surfaces in a quartz crystal microbalance (QCM), taking into consideration different surfactant concentrations, different surfactants, and the effect of different oils. In a previous study, the authors developed a method for determining the oil desorption from surfaces in QCM measurements. In this method the frequency decrease due to surfactant adsorption was determined experimentally by carrying out the blank measurements, and the role of the oil in the surfactant adsorption process was neglected. Therefore, in the developed calculation procedure for simplicity and practicality, it was assumed that the surfactant adsorption is independent of the oil properties. The analytical solution of the developed theoretically model in this study and the associated QCM experiments with different oils showed that taking into account the role played by the oil, it was possible to predict the difference in surfactant adsorptions with different type of oils, and there is a good agreement between analytical and experimental results. The results of the model reveal that surfactant\oil replacement on silica surfaces increased with increasing concentration of surfactant on silica surfaces. On the other hand, it decreased on aluminosilicate crystals with increasing surfactant concentrations.

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Some Compositional Viscosity Correlations for Crude Oils from Russia and Norway

Cited by 44 publications

References 28 publications

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Modeling of surfactant adsorption on coated quartz crystal surfaces during surfactant flooding process

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