Influence of Individual Ions on Oil/Brine/Rock Interfacial Interactions and Oil–Water Flow Behaviors in Porous Media
| Autor: | Xingguang Xu, Xuewen Ning, Colin D. Wood, Yang Yang, Bing Wei, Laiming Lu, Runnan Wu |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
General Chemical Engineering Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Ion Salinity Fuel Technology Adsorption Brine 020401 chemical engineering Chemical engineering Wetting Enhanced oil recovery 0204 chemical engineering 0210 nano-technology Relative permeability Porous medium |
| Zdroj: | Energy & Fuels. 31:12035-12045 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/acs.energyfuels.7b02458 |
| Popis: | The low salinity effect (LSE) in enhanced oil recovery (EOR) is widely accepted. However, its underlying mechanisms remain unclear due in part to the complex interactions at the oil/brine/rock interface. The chemistry of brine largely depends on the ionic composition. Thus, in this work, attention was placed on the roles of individual ions and salinity in LSE through direct measurements of oil/brine/rock interfacial behaviors, oil displacement efficiencies, and oil–water relative permeability in sandstone porous media. The results showed that the oil/water interfacial tensions (IFTs) were weakly dependent on ion and the lowest IFTs were generated at the salinities of 0.2–0.5 wt %. In contrast, the interfacial dilational modulus varied significantly with ion types and salinities due to the adsorption of polar components at the oil/water interface. Moreover, wettability alteration of the sandstone surface was found to be associated with the divalent ions in our work. As a result of the viscoelastic interfac... |
| Databáze: | OpenAIRE |
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