COMPOSITION FOR INCREASING THE PETROLEUM RECOVERY OF FORMATIONS (VARIANTS) Russian patent published in 2022 - IPC C09K8/74 C09K8/584 

FIELD: petroleum industry.

SUBSTANCE: invention relates to the petroleum industry and can be used to increase the petroleum recovery due to acid treatment of terrigenous reservoirs with varying permeability, including those saturated with high-viscosity petroleum. Composition for increasing the petroleum recovery according to the first variant contains a complex surface-active agent (surfactant) Neftenol VVD or a mixture of non-ionic surfactant AF 9-12, or NP-40, or NP-50, and an anion-active surfactant volgonat, or sulphonol, or NPS-6, or sodium laureth sulphate at a ratio of 2:1, boric acid and glycerine, polyatomic alcohol sorbitol, or pentaerythritol, and additionally hydrofluoric acid HF, at the following ratio of components, wt.%: complex surfactant or a mixture of a non-ionic surfactant and an anion-active surfactant 1.0 to 4.0; boric acid 1.0 to 15.0; glycerine 5.0 to 80.0; sorbitol or pentaerythritol 5.0 to 70.0; hydrofluoric acid HF 1.0 to 6.0; water the rest. Composition for increasing the petroleum recovery according to the second variant contains, wt.%: the above complex surfactant or a mixture of a non-ionic surfactant and an anion-active surfactant 1.0 to 4.0; boric acid 1.0 to 15.0; carbamide 5.0 to 10.0; glycerine 5.0 to 80.0; sorbitol or pentaerythritol 5.0 to 70.0; hydrofluoric acid HF 1.0 to 6.0; water the rest.

EFFECT: increase in the efficiency of petroleum displacement; increase in the permeability of the terrigenous reservoir of the formation both with high formation temperature or when subjected to a heat effect, and with low formation temperature.

2 cl, 5 dwg, 4 tbl, 15 ex