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Asphaltenes: The Cholesterol of Petroleum
Proceedings of Middle East Oil Show, 1995ABSTRACT Asphaltene precipitation and deposition has been recognized to be a significant problem in oil production, transmission, and processing facilities. The precipitation of asphaltenes is caused by a number of factors including changes in pressure, temperature, chemical composition of the crude oil, mixing the oil with diluents or ...
Selim G. Sayegh, Sunil Kokal
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Self-assembly of resins and asphaltenes facilitates asphaltene dissolution by an organic acid [PDF]
Journal of Colloid and Interface Science, 2013 Asphaltene precipitation occurs in petroleum fluids under certain unfavorable conditions, but can be controlled by tuning composition. Aromatic solvents in large quantities can prevent precipitation entirely and can dissolve already precipitated asphaltenes.
Abbas Firoozabadi, Sara M. Hashmi
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Petroleum Science and Technology, 1998
ABSTRACT We report x-ray scattering measurements on asphaltenes and bitumen solutions, with attention to the concentrated regimes. We characterize the data in terms of a correlation length which is indicative of proximity to phase separation in a mixture, rather than the radius-of-gyration more indicative of individual colloids.
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ABSTRACT We report x-ray scattering measurements on asphaltenes and bitumen solutions, with attention to the concentrated regimes. We characterize the data in terms of a correlation length which is indicative of proximity to phase separation in a mixture, rather than the radius-of-gyration more indicative of individual colloids.
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The Fractal Aggregation of Asphaltenes
Langmuir, 2013This paper discusses time-resolved small-angle neutron scattering results that were used to investigate asphaltene structure and stability with and without a precipitant added in both crude oil and model oil. A novel approach was used to isolate the scattering from asphaltenes that are insoluble and in the process of aggregating from those that are ...
Claudio Vilas Boas Favero +3 more
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Asphaltene Characterization: Sensitivity of Asphaltene Properties to Extration Techniques
Canadian International Petroleum Conference, 2001Abstract One step in asphaltene extraction is to wash the precipitated asphaltenes with the precipitant to remove trapped resinous material. To assess the effect of washing on asphaltene properties, asphaltenes were extracted with three different degrees of washing.
Harvey W. Yarranton +3 more
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1998
Asphaltenes have been studied extensively over the past 50–60 years.1–2 A number of experimental techniques have been employed. The simplest and most widely used technique is the measurement of the solubilities of isolated asphaltenes in various organic liquids, both aromatic solvents and flocculants like pentane.3–4 These studies yield valuable ...
Hilde Anfindsen, Per Fotland
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Asphaltenes have been studied extensively over the past 50–60 years.1–2 A number of experimental techniques have been employed. The simplest and most widely used technique is the measurement of the solubilities of isolated asphaltenes in various organic liquids, both aromatic solvents and flocculants like pentane.3–4 These studies yield valuable ...
Hilde Anfindsen, Per Fotland
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Fuel, 2016
Abstract Phosphopropoxylated asphaltenes were synthesized by functionalizing the Mexican VR asphaltenes with phosphorus trichloride and then reacting the product with different polypropylene oxides. Elemental analysis, and molecular weight characterization showed that in average one atom of phosphorus and one propoxyl moiety are incorporated to the ...
Estrella Rogel +3 more
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Abstract Phosphopropoxylated asphaltenes were synthesized by functionalizing the Mexican VR asphaltenes with phosphorus trichloride and then reacting the product with different polypropylene oxides. Elemental analysis, and molecular weight characterization showed that in average one atom of phosphorus and one propoxyl moiety are incorporated to the ...
Estrella Rogel +3 more
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SPE Western Regional Meeting, 2016
Abstract Significant effort has been dedicated to understand the variables affecting asphaltene precipitation. Based on years of research, it is well known how variables such as temperature and pressure can affect the deposition of asphaltenes.
Andreas Prakoso +5 more
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Abstract Significant effort has been dedicated to understand the variables affecting asphaltene precipitation. Based on years of research, it is well known how variables such as temperature and pressure can affect the deposition of asphaltenes.
Andreas Prakoso +5 more
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On Enthalpies of Solution of Athabasca Pentane Asphaltenes and Asphaltene Fractions
Energy & Fuels, 2012The analysis and prediction of asphaltene precipitation behaviors and asphaltene–diluent interactions are typically treated from either a solution thermodynamics or a colloid perspective. The polydispersity and multiphase nature of asphaltenes allows for portions of these materials to exhibit both behaviors concurrently at fixed global composition.
Kasra Nikooyeh, John M. Shaw
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Energy & Fuels, 2012
Asphaltenes extracted from seven different crude oils representing different geological formations from around the globe were analyzed using the Raman spectroscopic technique. Each spectrum is fitted with four main peaks using the Gaussian function. On the basis of D1 and G bands of the Raman spectrum, asphaltene indicated an ordered structure with the
Abdallah, Wael A., Yang, Yang
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Asphaltenes extracted from seven different crude oils representing different geological formations from around the globe were analyzed using the Raman spectroscopic technique. Each spectrum is fitted with four main peaks using the Gaussian function. On the basis of D1 and G bands of the Raman spectrum, asphaltene indicated an ordered structure with the
Abdallah, Wael A., Yang, Yang
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