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Showing 1 to 20 of 42 for “"asphaltene"”.
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New Insights into the Mitigation of Asphaltene Deposition and the Utilization of Asphaltene Deposits
Asphaltene deposition is an ongoing flow assurance problem in the oil and gas industry that is associated with huge economic loss. Different aspects to this problem which includes asphaltene stability, asphaltene deposition and asphaltene characterization has been studied over the past few decades. …
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Investigations of Asphaltene-Metal Interactions
Asphaltenes are the most polar fraction of petroleum that can precipitate due to changes in pressure, temperature and composition which may be encountered during petroleum production and transportation. The precipitated asphaltenes can subsequently deposit on the surfaces of …
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Laser treatment of Asphaltene based Carbon Fibers
… fiber. This research focuses on the use of asphaltene derived from Alberta oil sands as a low-cost alternative precursor, specifically exploring the graphitization step in carbon fiber manufacturing. In the conventional method, graphitization is conducted using a furnace between 2000 °C and …
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Insights into asphaltene stability, aggregation, deposition and molecular structure
Asphaltenes are the heaviest, most polar, and most surface-active species of crude oils which are fairly stable in the oil; however, a small variation in the pressure, composition, and temperature can cause asphaltene phase instability and alteration in their solubility parameter and can …
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Investigation of Asphaltene Adsorption at Liquid-Liquid and Liquid-Solid Interfaces
<p>Asphaltenes, as indigenous components in crude oils, are believed to play an important role in the petroleum production and processing industry. For example, asphaltene molecules can adsorb onto the water / oil interface like the amphiphiles and hinder water droplet coalescence, resulting in the …
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Characterization and Asphaltene Precipitation Modeling of Native and Reacted Crude Oils
The prediction and mitigation of asphaltene precipitation is an ongoing issue in upstream operations with native oils and in refinery processes of fluids from thermocracking and hydrocracking processes. Asphaltenes can precipitate with changes in pressure, temperature and composition, promoting …
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Investigation of Asphaltene Instability Under Gas Injection in Unconventional Reservoirs and its Impact on Oil Recovery Performance
… these reservoirs often contain high levels of asphaltenes, which can lead to deposition and blockages in production wells and reduce the flow of hydrocarbons during gas enhanced oil recovery (GEOR) techniques. This study aims to experimentally evaluate the impact of miscible and immiscible …
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Measurement and Modeling of Pentane-Diluted Bitumen Phase Behaviour
… have successfully fit saturation pressures and asphaltene onset points for bitumen-solvent systems using simple quadratic mixing rules; they do not accurately predict asphaltene precipitation yields. This thesis focuses on data collection and CEoS modeling with asymmetric mixing rules for …
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Geochemical study on reservoir and source rock asphaltenes and their significance for hydrocarbon generation
Erdölasphaltene, Muttergesteinsasphaltene und Muttergesteinskerogene wurden mittels verschiedener analytischer Pyrolysetechniken bezüglich ihres Kohlenwasserstoff-genesepotentials untersucht. Besonderes Interesse wurde hierbei der kompositionellen Zusammensetzung der generierten Kohlenwasserstoffe …
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New insight into the coordination and reactivity of hetero-substituted maltol and method development for complex mixture analysis of asphaltene.
… development of a new method for investigating asphaltenes, the heaviest and most problematic fraction of crude oil, by NMR spectroscopy and mass spectrometry. To study asphaltenes by mass spectrometry, we reacted a sample of asphaltene with elemental bromine (Br2). This was done to selectively …
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Precipitation, Aggregation, and Settling of Asphaltenes from n-Alkane Diluted Bitumens
… the precipitation, aggregation, and settling of asphaltenes from solvent diluted bitumen. Models and data that include the effect of solvent type, concentration, shear, and contact time on asphaltene precipitation and settling are required to design and optimize these processes but are lacking or …
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Partial Upgrading of Bitumen Through Combinations of Deasphalting and Visbreaking
… that reduces viscosity and density but risks asphaltene precipitation and coke formation at high conversions. Solvent deasphalting separates out the densest, most viscous components from the oil but would also remove too much of the valuable oil components to achieve pipeline specifications. …
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Viscosity and Stability of Visbroken Fractionated Oils
… far, this process can destabilize the oil (cause asphaltene precipitation and coke formation). De-asphalting decreases the oil density and can allow more intensive visbreaking without destabilizing the oil. These processes can be applied to both bitumen and vacuum bottom feeds. In all cases, it is …
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Revitalizing Simulations of Colloidal and Interfacial Systems: From Atomistic Trajectories to Data-Centric Insights
… water-in-oil emulsions, chemical inhibition in asphaltene aggregation, and adsorption energy prediction. While each theme addresses unique challenges, they all contribute to quantitative understanding of interactions across scales, integrating structural, thermodynamic, and energetic …
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Separation and characterization of crude oils and investigation of their wetting properties on rock surfaces
… fractions: Saturates, Aromatics, Resins, and Asphaltenes. Currently, some of the available methods for SARA separation are based on chromatographic principles that may possess some limitations, including requiring the solvent and sample in large amounts, being a time-consuming process, and …
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Application of Taylor Dispersion Technique to Measure Molecular Diffusion Coefficient of Hexane-Bitumen System
… both cases of presence and relative absence of asphaltene particles in the solution. As the first result, polydisperse nature of bitumen is clearly revealed. Results were compared with common predictive tools and the most reliable correlation is proposed. Also, it is found that asphaltene …
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Role of Nanosize Effects on the Adsorptive and Catalytic Properties of NiO Nanoparticles towards Heavy Hydrocarbons
… Quinolin-65 (Q-65) was first used as an asphaltene model molecule. Langmuir and Freundlich adsorption isotherms models and computational modeling for the interaction between NiO nanoparticle surface and Q-65 were carried out to understand the adsorption behavior. TGA/DTA and TGA-MS …
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Adsorption & Adhesion of Asphaltenes at Complex Interfaces: An AFM Approach
Asphaltenes are the heaviest fraction of crude oil, pinpointed as the culprit for the fouling of components throughout the hydrocarbon value chain. The ill-defined nature of asphaltenes has challenged scientists and industry alike, to determine their molecular composition and mitigate their effects …
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