Papers by Oiyehi Francis
Asphaltene precipitation from crude oils is one of the flow assurance issues for the oil industry... more Asphaltene precipitation from crude oils is one of the flow assurance issues for the oil industry. Precipitation can be significantly affected by the changes in composition and pressure of the crude oil. For example, asphaltenes precipitate upon mixing of incompatible oils or solvents to crude oils, and pressure depletion in conventional oils containing solution gas. The focus of this thesis was to develop a phase behavior model for predicting the onset and the amount of precipitation from solvent-diluted crude oil blends and oils undergoing depressurization. Furthermore, crude oils with no or very little water are always considered for asphaltene precipitation measurements and modeling. In reality, the crude oils are often co-produced or extracted with water. Hence, the thesis also investigates the effect of water on asphaltene precipitation.
A model which is based on Flory-Huggins polymer-solution theory and Hildebrand solubility concept... more A model which is based on Flory-Huggins polymer-solution theory and Hildebrand solubility concept has been developed which shows an excellent match with experimental data. The fine-tuned model is then possible to predict weight percent of precipitated asphaltene at wide range of conditions (changes in pressure, temperature and composition). The prediction can be used to identify at which conditions lead to precipitation of asphaltene.
Thesis Chapters by Oiyehi Francis
Asphaltene precipitation from crude oils is one of the stream affirmation issues for the oil busi... more Asphaltene precipitation from crude oils is one of the stream affirmation issues for the oil business. Precipitation can be essentially influenced by the adjustments in organization and weight of the crude oil. For instance, asphaltenes hasten after blending of contradictory oils or solvents to crude oils, and weight consumption in traditional oils containing arrangement gas. Moreover, crude oils with no or almost no water are constantly considered for asphaltene precipitation estimations and demonstrating. The paper shows a layout survey of Asphaltene precipitation and its models.
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Papers by Oiyehi Francis
Thesis Chapters by Oiyehi Francis