Συντάχθηκε 29-10-2025 13:30
Τόπος: Μ4 - Κτίριο ΜΗΧΟΠ, Μ4.003, ΔΙΑ ΖΩΣΗΣ
Έναρξη: 03/11/2025 12:00
Λήξη: 03/11/2025 13:00
Τίτλος εργασίας: «Εντοπισμός και χαρακτηρισμός ασφαλτενίων σε αργό πετρέλαιο.»
Τίτλος εργασίας στα αγγλικά: “Asphaltenes monitoring and characterization in crude oil”
Τριμελής εξεταστική επιτροπή
1. Nικόλαος Πασαδάκης, καθηγητής σχολής ΜΗΧΟΠ (Επιβλέπων)
2. Δρ. Σταύρος Πισσαδάκης (FORTH-IESL)
3. Δρ. Ελευθερία Αντωνίου, μέλος ΕΔΙΠ σχολής ΜΗΧΟΠ
ABSTRACT
In this study, the adsorption behavior of asphaltene fractions from Greek Prinos crude oil onto calcite and dolomite mineral powders was investigated. Asphaltenes, the heaviest and most polar components of crude oil, are known for their complex structure, high aromaticity, and tendency to precipitate under certain conditions, often leading to flow assurance issues. A modified version of the IP143 method was employed for the extraction of asphaltenes, using mineral powders derived from Greek source rocks as the adsorbents. By allowing prolonged precipitation times in n-heptane, higher yields were obtained, offering a more efficient recovery route for surface-interacting species. The experiment yielded five distinct asphaltene fractions: whole, bulk, normally adsorbed, heavily adsorbed, and irreversibly adsorbed. Analytical techniques including CHNSO elemental analysis, Fourier-transform infrared spectroscopy (FTIR), and mass balance assessments were used for characterization. Results revealed a clear correlation between increasing polarity and stronger surface adhesion to the mineral substrate. Additionally, a trend of decreasing carbon content was observed with increasing polarity. Notably, the use of tetrahydrofuran (THF) as a solvent led to the unexpected formation of a sludge-like residue, potentially indicative of polymerization or strong complexation with the asphaltenes—an occurrence not commonly reported in the literature.
These findings not only deepen our understanding of asphaltene–mineral interactions in carbonate reservoirs but also provide a methodological framework for future studies focused on improving reservoir wettability profiling and asphaltene management strategies in enhanced oil recovery (EOR) operations.
