Journal
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
Volume 211, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.petrol.2022.110134
Keywords
Asphaltene; Deposition and removal; pH alterations; Sodium dodecyl sulfonate (SDS); Cetyltrimethylammonium bromide (CTAB); Parallel plate channel; Atomic force microscopy (AFM)
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Funding
- Shell Technology Centre Bangalore, India
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In this study, asphaltene removal from silica surface using shear forces of aqueous media in a parallel plate channel was investigated. The results showed that the removal efficiency of asphaltene varied with different pH and surfactant conditions in the aqueous media. Cationic surfactant was found to significantly improve the removal efficiency, while anionic surfactant was ineffective.
Asphaltene removal from sediments is essential for enhanced oil recovery from heavier crude oil reservoirs and tar sands and bitumen recovery from bottom products in downstream processes. Water injection or water flooding at high pressures exert shear forces that can overcome the adhesive forces between asphaltene and mineral surfaces. The adhesive forces are also affected by ions in the aqueous medium. In the current work we study asphaltene removal from silica surface using shear forces of aqueous media in a parallel plate channel. We demonstrate the effect of varying pH and surfactant conditions in aqueous media on asphaltene removal efficiency. We relate the removal efficiency with fractional asphaltene volume on the surface estimated from atomic force microscopy. The fractional asphaltene volume reduces to 0.12 at pH 10, which is approximately 50% lower than water at neutral pH at the same shear rate. We show that the water-soluble anionic surfactants are inefficient in asphaltene removal, whereas cationic surfactant reduces the asphaltene fraction to 0.30. We conclude that the removal efficiency is affected by the zeta potential of the asphaltene and the surface, where electrostatic repulsion between the asphaltene and the surface and increased wettability in the presence of cationic surfactant improves asphaltene removal.
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