Oil as an Object of Rheology (Review)

Malkin, A. Ya.

doi:10.1134/s0965544119100062

Cited by 20 publications

(11 citation statements)

References 106 publications

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“…For the high asphaltene concentration, the association energy (absolute value) substantially increased with the increase in the number of aromatic carbons . The ratio of the number of aromatic groups in the peripheral part of asphaltene molecules to the total aromatics content strongly affects the asphaltene aggregation . From Figure , it also can be seen that the asphaltene molecules in OIL3 have an island structure, while the molecular structure of asphaltenes in OIL4 is a continental structure with larger polycondensed aromatic rings.…”

Section: Resultsmentioning

confidence: 92%

“…30 The ratio of the number of aromatic groups in the peripheral part of asphaltene molecules to the total aromatics content strongly affects the asphaltene aggregation. 1 From Figure 1, it also can be seen that the asphaltene molecules in OIL3 have an island structure, while the molecular structure of asphaltenes in OIL4 is a continental structure with larger polycondensed aromatic rings. The aggregate structures of asphaltene in OIL3 and OIL4 are shown in Figure 8.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…With the decrease of available resources of conventional oil, heavy crude oil has become an important energy source of the world. Heavy crude oil and ultra-heavy oil are defined by the American Petroleum Institute (API) as having an API gravity less than or equal to 22.3 and 10 . Due to its complex compositions, high viscosity, and sensitivity to external conditions, heavy crude oil often faces a series of challenges in the process of oil recovery, storage, transportation, and refining. , The viscosity of heavy crude oil varies from 100 to over 10 5 mPa·s, while the viscosity that would enable the pipeline transport of oil in existing networks is close to 400 mPa·s .…”

Section: Introductionmentioning

confidence: 99%

“…Hemmati-Sarapardeh et al observed a slight increase in asphaltene aggregate size as the asphaltene concentration in toluene increased. Numerous attempts have been repeatedly made to find correlations between the asphaltene concentration and the viscosity of heavy oil. ,, In fact, a relative low asphaltene concentration also can cause severe deposition problems, and different asphaltene components do not contribute equally to aggregation and precipitation, which indicates the role of not only the concentration of asphaltenes but also their structures and compositions.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 92%

Section: ■ Results and Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The transportation of such oils in the difficult climatic conditions of the Far North is associated with technological problems arising from the cooling of oil during the pumping process. Various aspects of these problems are discussed in [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Application of induction heaters for pumping high-wax oil from the Kyrtaelskoye field

Nekuchaev

Mikheev

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The article discusses modern views on the problem of pipeline waxing when transporting highly paraffinic oil from the Kyrtaelskoye field in the Komi Republic via the Kyrtael - Chikshino oil pipeline and possible ways to improve the rheological properties of the pumped oil. The paper presents the results of measuring the rheological characteristics of samples from one batch of oil as it flows through the pipeline, as well as the results of modeling the operation of the pipeline in the NIPAL 3.0 program for various pumping options. It has been established that, taking into account the complex rheological properties of oil pumped through the interfield oil pipeline PPSN “Kyrtael” - PSP “Chikshino”, the operation of the oil pipeline is possible at pumping volumes of at least 2300 tons / day due to an increase in the critical operating pressure in the oil pipeline. At the moment, a Flexoil depressant is injected into the oil stream to improve the rheological parameters. In connection with a gradual decrease in the volume of oil pumping, the speed of oil movement decreases and the temperature of the pumped oil decreases below the pour point. Even with the use of a pour point depressant, the pipeline will not be able to operate at the beginning of 2024 (according to the existing operation scheme). The analysis of the problem of pumping oil through an interfield oil pipeline performed in this work shows the need to achieve optimal parameters for pumping oil during the operation of the pipeline under consideration in order to ensure the safety of oil transportation from the Kyrtaelskoye field and further pumping into the system of Transneft-Sever JSC into the Usa-Ukhta main oil pipeline. The paper considers standard methods of oil heating with the help of line heaters, as well as the method of oil heating on the linear part of the interfield oil pipeline using induction flow heaters, which were first proposed when pumping oil through the oil pipeline PPSN “Kyrtael” - PPSP “Chikshino”.

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Rheology of waxy oils: A critical review

Andrade,

Negrão

2025

Applications in Engineering Science

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Oil as an Object of Rheology (Review)

Cited by 20 publications

References 106 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

Application of induction heaters for pumping high-wax oil from the Kyrtaelskoye field

Rheology of waxy oils: A critical review

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