Polymer-monodispersed nano-microspheres for deep profile control and flooding, and preparation method thereof

摘要

Polymer-monodispersed nano-microspheres for deep profile control and flooding. The polymer-monodispersed nano-microspheres comprise (% wt.): 0.05 to 2.5% of macromolecules A, 0.05 to 2.5% of macromolecules B, 0.002 to 0.05% of an oxygen scavenger, and mineralized water. Macromolecules A comprise a straight-chain water-soluble polymer with an ethyl ether or propyl ether structure. Macromolecules B comprise a water-soluble polymer with a hydroxyl or polyphenolic structure. Macromolecules A and macromolecules B are intermolecularly assembled under the drive of extremely strong hydrogen bonds in aqueous solutions to rapidly construct monodispersed nano-microsphere dispersion glue with a controllable size. The monodispersed nano-microspheres have a good seepage in a porous medium and excellent deep profile control and flooding capabilities.