Effect of pH and surfactants on shear induced asphaltene removal

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NSTL
Elsevier

外文摘要：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.

外文关键词：

AsphalteneDeposition and removalpH alterationsSodium dodecyl sulfonate (SDS)Cetyltrimethylammonium bromide (CTAB)Parallel plate channelAtomic force microscopy (AFM)ATOMIC-FORCE MICROSCOPYMATHEMATICAL-MODEL EVALUATIONIONIC SURFACTANTSADSORPTIONDEPOSITIONOILRESINSWATERSTABILIZATIONPRECIPITATION

作者：

Rizvi, Syed Haider Abbas、Bharatbhai, Shrimali Jonit、Gupta, Shivam、Phirani, Jyoti、Singh, Vikram

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作者单位：

Indian Inst Technol Delhi

出版年：

2022

DOI：

10.1016/j.petrol.2022.110134

Journal of Petroleum Science & Engineering

ISSN：0920-4105

年,卷(期)：2022.211

参考文献量73