FIELD: oil and gas production.
SUBSTANCE: concentrate contains galactomanine as polysaccharide and surfactant at their ratio (0.05-2.0):(0.01-1.0), respectively. Concentrate further contains modified starch according to following ratio: (0.05-2.0):(0.01-1.0):(0.1-3.0), respectively, or sodium benzoate and/or potassium sorbate at following ratio: (0.05-2.0):(0.01-1.0):(0.01-0.5), respectively, or modified starch and/or sodium benzoate, and/or potassium sorbate at following ratio: (0.05-2.0):(0.01-1.0):(0.1-3.0):(0.01-0.5), respectively. Oil displacement composition contains 0.05 to 6.5% of indicated concentrate and solvent (the rest).
EFFECT: improved oil displacement properties from various-permeation formations with any mineralization.
5 cl, 2 tbl, 5 ex
