Synergistic interactions between SARA fractions in the formation of asphaltenes aggregates

Abstract

Abstract: Asphaltenes are petroleum macromolecules with high molar weight, high polarity and marked surface activity. Colloidal characteristics of the asphaltene fractions have influenced the formation and stabilization of emulsions and foams, reservoir-rock wettability and deposition and adhesion of solids on surfaces. The present project aims to study the influence of interactions between SARA fractions on the formation of asphaltenes aggregates. The study uses analytical methods for the molecular description of colloidal aspects of the petroleum, which are related to the remediation of flow assurance problems. Specifically, the project will use tensiometric and spectroscopic techniques to describe the synergy of SARA fractions in the asphaltenes aggregation process, contributing to a better understanding and description of the phenomenon of aggregation and precipitation that impact the flow of oil. The experimental methodology includes the extraction and characterization of the SARA fractions, the analysis of the properties of the interfacial films, the description of the rheological behavior of interfacial films and the evaluation of interactions between the SARA fractions (using the quartz microbalance - QCM), together with data compositions obtained by nuclear magnetic resonance spectroscopy and infrared spectroscopy, to evaluate the interaction and aggregation of the colloidal fractions of petroleum. The intended results are in line with the demand for strategies to remediate the effects resulting from the aggregation of oil macromolecules, in order to reduce problems and risks in the oil industry. (AU)