ADDITIVES FOR EXTRACTION OF OIL FROM OIL FORMATIONS Russian patent published in 2012 - IPC C09K8/86 C09K8/88 E21B43/22 C08G73/02 

FIELD: oil and gas industry.

SUBSTANCE: method for extraction of oil from carbonate formations involves dilution in water or salt solution (in quantity of 0.01-20%) of quarternary polyamines of the specified formula, where n≥1; R₁ represents H, CH₃, CH₂CH₃, CnH_2n+1; R₂ represents H₂CHOHCH₂, CH₂, CH₂CH=CH₂, R₃ represents CH₃, CH₂CH₃, CnH_2n+1; R₄ represents CH₂, CH₂CH=CH₃; and if R₂ and R₄ represent allyl groups, then altogether they can form aliphatic cyclic structures; ratio between atoms of carbon and nitrogen (C/N) is at the interval of 2 to 30, and further introduction to the well.

EFFECT: increasing oil extraction degree.

15 cl, 30 ex, 4 tbl, 5 dwg