| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 592350 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2015 | 9 Pages |
•A series of copolymer/ionic liquids complexes (PAAD/ILs) were used for EOR.•PAAD/C8mimBr complex can effectively reduce the IFT of water/crude oil.•PAAD/C8mimBr complex with NaCl can further reduce IFT of water/crude oil.•PAAD/C8mimBr complex exhibits excellent temperature resistance.•PAAD/C8mimBr complex can enhance oil recovery as high as 21.65%.
The current study introduces the water-soluble complexes containing hydrophobically associating copolymer and a series of surface activity imidazolium-based ionic liquids (CnmimBr, n = 6, 8, 10, 12, 14 and 16). The polymer, denoted as PAAD, was prepared with acrylamide (AM), acrylic acid (AA) and N,N-diallyl-2-dodecylbenzenesulfonamide (DBDAP). And the hydrophobic associative behavior of PAAD was studied by a combination of the pyrene fluorescence probe and viscosimetry. Incorporation of CnmimBr (n = 10, 12, 14 and 16) in PAAD leaded to the white thick gel, while the pellucid solutions were obtained in complexes of PAAD and CnmimBr (n = 6 and 8); addition of C6mimBr around critical micelle concentration resulted in a large decrease in viscosity of solution. Therefore, we particularly investigated the performance of PAAD/C8mimBr complex. The interfacial tension of PAAD/C8mimBr complex solution and crude oil under different conditions was examined. Moreover, PAAD/C8mimBr complex exhibited superior temperature resistance and shear reversible performance for enhancing oil recovery (EOR) by rheological test. The promising EOR of 21.65% can be obtained by PAAD/C8mimBr complex showing high potential to utilize this kind of new complex in EOR processes.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
