Drivers of pH increase and implications for low salinity effect in sandstone
© 2018 Elsevier Ltd. Low salinity water flooding appears to be a cost-effective and environmentally friendly means to shift wettability of oil/brine/rock system towards more water-wet, thus improving hydrocarbon recovery. While the contribution of kaolinite (edge-charged clays) on low salinity effec...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
Elsevier Ltd
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/66516 |
| _version_ | 1848761340762521600 |
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| author | Chen, Yongqiang Xie, Sam Pu, W. Saeedi, Ali |
| author_facet | Chen, Yongqiang Xie, Sam Pu, W. Saeedi, Ali |
| author_sort | Chen, Yongqiang |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 Elsevier Ltd. Low salinity water flooding appears to be a cost-effective and environmentally friendly means to shift wettability of oil/brine/rock system towards more water-wet, thus improving hydrocarbon recovery. While the contribution of kaolinite (edge-charged clays) on low salinity effect has been extensively investigated, how basal-charged clays (e.g., illite, smectite, and chlorite) contributing to the low salinity effect remains unclear. We thus hypothesize that low salinity water facilitates ion exchange in the presence of basal charged clays, thus lifting off oil films from pore surfaces. To test the hypothesis, we performed a geochemical study using PHREEQC in light of double layer diffuse theory. We quantitatively interpreted the pH increase and low salinity effect from corefloods conducted by RezaeiDoust et al. [RezaeiDoust A, Puntervold T, Austad T. Chemical verification of the EOR mechanism by using low saline/smart water in sandstone. Energy & Fuels. 2011;25(5):2151–62.]. We demonstrate that low salinity water triggers a pH increase at the presence of basal-charged clays, thus a more water-wet because of ion exchange. We therefore expand the application envelope of low salinity water flooding to reservoirs with basal-charged clays. |
| first_indexed | 2025-11-14T10:30:07Z |
| format | Journal Article |
| id | curtin-20.500.11937-66516 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:30:07Z |
| publishDate | 2018 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-665162018-07-09T03:03:41Z Drivers of pH increase and implications for low salinity effect in sandstone Chen, Yongqiang Xie, Sam Pu, W. Saeedi, Ali © 2018 Elsevier Ltd. Low salinity water flooding appears to be a cost-effective and environmentally friendly means to shift wettability of oil/brine/rock system towards more water-wet, thus improving hydrocarbon recovery. While the contribution of kaolinite (edge-charged clays) on low salinity effect has been extensively investigated, how basal-charged clays (e.g., illite, smectite, and chlorite) contributing to the low salinity effect remains unclear. We thus hypothesize that low salinity water facilitates ion exchange in the presence of basal charged clays, thus lifting off oil films from pore surfaces. To test the hypothesis, we performed a geochemical study using PHREEQC in light of double layer diffuse theory. We quantitatively interpreted the pH increase and low salinity effect from corefloods conducted by RezaeiDoust et al. [RezaeiDoust A, Puntervold T, Austad T. Chemical verification of the EOR mechanism by using low saline/smart water in sandstone. Energy & Fuels. 2011;25(5):2151–62.]. We demonstrate that low salinity water triggers a pH increase at the presence of basal-charged clays, thus a more water-wet because of ion exchange. We therefore expand the application envelope of low salinity water flooding to reservoirs with basal-charged clays. 2018 Journal Article http://hdl.handle.net/20.500.11937/66516 10.1016/j.fuel.2018.01.037 Elsevier Ltd restricted |
| spellingShingle | Chen, Yongqiang Xie, Sam Pu, W. Saeedi, Ali Drivers of pH increase and implications for low salinity effect in sandstone |
| title | Drivers of pH increase and implications for low salinity effect in sandstone |
| title_full | Drivers of pH increase and implications for low salinity effect in sandstone |
| title_fullStr | Drivers of pH increase and implications for low salinity effect in sandstone |
| title_full_unstemmed | Drivers of pH increase and implications for low salinity effect in sandstone |
| title_short | Drivers of pH increase and implications for low salinity effect in sandstone |
| title_sort | drivers of ph increase and implications for low salinity effect in sandstone |
| url | http://hdl.handle.net/20.500.11937/66516 |