Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"asphaltene precipitation"”.
-
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 …
-
Precipitation, Aggregation, and Settling of Asphaltenes from n-Alkane Diluted Bitumens
Several industrial processes involve 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 …
-
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 …
-
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. …
-
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. …
-
Development and application of a parallel compositional reservoir simulator
… finite difference, physical dispersion, and asphaltene precipitation. The parallelization was verified for several case studies using multiple processors. The parallel simulator produces outputs required for visualizing simulation results using the S3graph visualization software. The …
-
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 …
-
Heavy Oil Recovery by Gas Assisted Gravity Drainage in Naturally Fractured Reservoirs
… of all physical phenomena, such as asphaltene precipitation and matrix-fracture interaction, would require fine grid simulation and a huge amount of numerical work.
-
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 …
-
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 …