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An Experimental Study of the Influence of the Preflush Salinity on Enhanced Oil Recovery Using Silica-Based Nanofluids
| Content Provider | MDPI |
|---|---|
| Author | Sreu, Tola Sasaki, Kyuro Sugai, Yuichi Nguele, Ronald |
| Copyright Year | 2021 |
| Description | The underlying effect of preflush salinity and silica nanofluid (Si-NF) on oil production is examined. The influence of salinity on the stability of Si-NFs is studied. A series of sand-pack floodings evaluating oil production was conducted at different concentrations of preflush salinity (0 to 4 wt.%), followed by the injection of a Si-NF (0.5 wt.%) at the trail of which postflush water was injected. The effluent water and solids were collected and analyzed using X-ray fluorescence (XRF). Interfacial tension (IFT) and contact angle measurements were conducted on the Si-NF in the presence of salinity to confirm the effect. The Si-NF became unstable and formed precipitate in the presence of salinity. The sand-pack flooding showed that when the preflush salinity was increased, the displacement efficiency $(E_{D}$) using the Si-NF and postflush injection was increased $(E_{D}$ = 44%). The XRF of the precipitated effluent revealed that the preflush salinity and Si-NF caused mineral leaching, which triggered pore clogging. The IFT value reduced from 13.3 to 8.2 mN/m, and the wettability was altered to be more strongly water-wet when the salinity increased. The primary mechanisms of oil recovery using the Si-NF after preflush salinity is attributed mainly to the clogging mechanism. This clogging helps block the high-perm area, shift the fluid flow to the oil-trapped zone, and free the oil out. Other contribution mechanisms are IFT reduction and wettability alteration. |
| Starting Page | 6922 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en14216922 |
| Journal | Energies |
| Issue Number | 21 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-10-21 |
| Access Restriction | Open |
| Subject Keyword | Energies Petroleum Engineering Enhanced Oil Recovery Sand-pack Flooding Silica Nanofluid Precipitation Sedimentation Saline Water Pore Clogging Interfacial Tension Contact Angle Wettability Alteration |
| Content Type | Text |
| Resource Type | Article |
