METHOD OF EXTRACTING CRUDE OIL, INVOLVING INJECTION OF RESIN Russian patent published in 2024 - IPC E21B43/22 E21B37/06 C09K8/524 C09K8/588 

FIELD: oil, gas and coke-chemical industry; mining.

SUBSTANCE: invention relates to oil production. Method of extracting crude oil from a geological formation in which it occurs includes the following stages: (i) a first step in which at least one compound is injected under pressure into a geological formation, which is a modified alkylphenol-aldehyde resin, (ii) a second stage, at which crude oil is extracted from the geologic formation. Said modified alkylphenol-aldehyde resin is obtained by a Mannich reaction of a condensation alkylphenol-aldehyde resin with at least one aldehyde and/or ketone containing from 1 to 8 carbon atoms, and at least one hydrocarbon compound containing at least one alkylpolyamine group containing from 1 to 30 carbon atoms. Said condensation alkylphenol-aldehyde resin is obtained by condensation of at least one alkylphenol substituted with at least one alkyl group, linear or branched, comprising from 1 to 30 carbon atoms, with at least one aldehyde and/or ketone containing from 1 to 8 carbon atoms.

EFFECT: increased efficiency of oil production and inhibition of paraffin deposition at limitation of quantity of used resin in composition of oil and oil products.

14 cl, 4 tbl, 2 ex