COMPOSITION FOR INCREASING OIL RECOVERY OF FORMATIONS Russian patent published in 2020 - IPC C09K8/584 C09K8/74 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil industry, in particular to development of oil deposits and oil production, and can be used for increasing oil recovery of formations. Composition for increasing oil recovery of formations, containing a complex surface-active substance - surfactant or mixture of non-ionic surfactant and anion-active surfactant in ratio 2:1, boric acid, carbamide, glycerine and water, additionally contains ammonium nitrate and aluminium salt AlCl_3, with the following ratio of components, wt. %: surfactant - non-ionic surfactant neonol AF 9–12 and volgonate anionactive surfactant or complex surfactant Neftenol VVD 1.0–4.0, boric acid 2.0–5.0, carbamide 10.0–30.0, glycerol 20.0–50.0, aluminium salt AlCl₃ - AlCl₃⋅6H₂O or aluminium hydroxychloride Aqua-Aurat 30 in terms of anhydrous 2.0–3.0, ammonium nitrate NH₄NO₃ 5.0–10.0, water is the rest.

EFFECT: technical result is providing in a wide temperature range from 20 to 220 °C, adjusting viscosity to achieve optimum ratio of viscosities of formation oil and displacing working agent and as a result of this increase in formation coverage ratio by exposure, as well as controlled alkalinity to achieve optimum pH level, providing maximum action and minimum adsorption of surfactants, low interfacial tension at boundary with formation oil, and as a result of increasing oil displacement factor.

1 cl, 14 ex, 3 tbl, 4 dwg