RESERVOIR RECOVERY IMPROVEMENT METHOD Russian patent published in 2015 - IPC E21B43/22 C09K8/58 C09K8/88 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to oil industry, in particular, to treatment of producers and injectors with hard to recover reserves. In reservoir recovery improvement method that includes subsequent injection to the reservoir of at least two equal portions of polymer fringe in water and salt cross-linking agent in water with water buffer between them AMG reagent is used as cross-linking agent and fringes of argillic agent in water and fringes of multifunctional agent and aliphatic and/or aromatic alcohol or bypass products containing them are injected additionally with provided reduced interfacial tension in oil-water system up to 0.005 mN/m, with the following sequence of fringes with the following composition, wt %: 1) 0.001-3 polymer in water, 2) 0.0001-0.5 AMG in water, 3) 0.0001-20 argillic agent in water, 4) multifunctional agent 0.1-99.9 and the above alcohol and bypass products in the remaining volume with ratio of the composition 1) and multifunctional agent equal to 1: (0.06-0.25) or 1) 0.001-3 polymer in water, 2) 0.0001-0.5 AMG in water and 3) 0.0001-20 argillic agent in water, 3) multifunctional agent 0.1-99.9 and the above alcohol and bypass products in the remaining volume with ratio of the composition 1) and multifunctional agent equal to 1:0.06-0.25.

EFFECT: improving efficiency.

3 ex, 1 tbl