Table 11 Quantitative comparison of FTIR-derived indices for asphaltenes in crude oil and after exposure to Sr2+-based FW and SW with 4 × Na2SO4, under scale and non-scale conditions.
From: Influence of inorganic scale formation on asphaltene behavior during water injection
Functional group index | Crude oil | With scale formation | Without scale formation |
|---|---|---|---|
S = O (Sulfoxide index) | 0.0308 | 0.0417 | 0.0470 |
C = O (Carbonyl index) | 0.0026 | 0.0372 | 0.0323 |
Polarity index | 0.1296 | 0.1239 | 0.1035 |
Aromatic index | 0.1458 | 0.1570 | 0.1700 |
Aliphatic index | 0.6110 | 0.4638 | 0.5024 |
