OIL RESERVOIR DEVELOPMENT METHOD Russian patent published in 2005 - IPC

FIELD: oil production equipment, particularly for development oil reservoirs characterized by zonal non-uniformity and formed by terrigenous rock.

SUBSTANCE: method involves alternating injecting acid solution and polymer-and-alkaline solution beginning from acid solution, wherein the polymer-and-alkaline solution includes water-soluble carbonate , water-soluble polymer and water so that gaseous carbon dioxide is generated as a result of their reaction; forcing carbon dioxide plug with water. Acid solution is aqueous solution of hydrochloric acid, lignosulphonate, solvent and nonionic surfactant or aqueous solution of hydrochloric and/or hydrofluoric acid, solvent and nonionic surfactant or composition including hydrochloric acid in amount of 10.0-25.9 % by weight, nonionic surfactant in amount of 0.05-1.0 % by weight and water. After acid solution injection polymer-and-alkaline solution is forced, wherein the polymer-and-alkaline solution includes water-soluble carbonate in amount of 5.0-15.0 % by weight, water-soluble polymer in amount of 0.05-1.0 % by weight, remainder is water.

EFFECT: increased efficiency of oil reservoir development and, as a result, increased reservoir treatment area and increased oil recovery by forming oil-displacing agent directly in reservoir environment.

12 ex, 1 tbl