Abstract
The work is devoted to investigation of the dispersing additive influence on asphaltenes aggregation in the asphaltenes-toluene-heptane model system by photon correlation spectroscopy method. The experimental relationship between the onset point of asphaltenes and their concentration in toluene has been obtained. The influence of model system composition on asphaltenes aggregation has been researched. The estimation of aggregative and sedimentation stability of asphaltenes in model system and system with addition of dispersing additive has been given.
Highlights
Over the last decade, the share of unconventional Russian reserves has increased significantly, in high viscosity oil and natural bitumen
The aim of this work is to address the influence of dispersing additives on asphaltene aggregation in model system by the photon correlation spectroscopy method
With figure 5 and table 1 it can be concluded that addition of the additive in small amounts leads to the increase in the asphaltenes aggregation time, which increases the sedimentation stability of asphaltenes
Summary
The share of unconventional Russian reserves has increased significantly, in high viscosity oil and natural bitumen. One of the main problems is the high content of asphaltenes, which can reach 20% in such oils [1, 2]. Asphaltenes are usually classified as the most polar fraction of crude oil that are soluble in aromatic solvents but insoluble in normal alkanes. Asphaltenes are identified as molecules having polyaromatic and polycyclic rings with short aliphatic chains and heteroatoms, such as nitrogen, oxygen and sulfur. Aromaticity, and heteroatom content in asphaltenes causes a strong tendency to self-association and the formation of supramolecular aggregates even in very dilute organic solvents. In this regard the prevention of asphaltenes sedimentation stability loss is an important scientific and practical task
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