COMPOSITION FOR INCREASING OIL RECOVERY OF FORMATIONS (VERSIONS) Russian patent published in 2019 - IPC C09K8/74 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil industry and can be used to increase oil recovery of carbonate reservoirs with different permeability, saturated with high-viscosity oil. Composition for increasing oil recovery of formations in the first version contains the following, wt%: complex surfactant or mixture of nonionic surfactant and anion-active surfactant 1.0–4.0; boric acid 1.0–15.0; glycerine 0–50.0; sorbitol or mannitol 1.0–70.0; water – balance. Composition for increasing oil recovery of formulations according to the second version contains the following, wt%: complex surfactant or mixture of nonionic surfactants and anion-active surfactant 1.0–4.0; boric acid 1.0–15.0; glycerine 0–50.0; carbamide 5.0–10.0; sorbitol or mannitol 1.0–70.0; water – balance.

EFFECT: higher total solubility of the carbonate rock of the formation, duration of the composition, possibility of controlling the rate of dissolution of the carbonate reservoir.

2 cl, 6 dwg, 2 tbl, 12 ex