FIELD: oil and gas industry.
SUBSTANCE: invention relates to the field of corrosion protection of gas and oil field equipment and pipelines operating in highly mineralized hydrogen sulfide-containing aqueous media, as well as during the transportation of oil and gas. The method for obtaining corrosion inhibitors for oilfield, mineralized and hydrogen sulfide-containing media based on polypropylene polyamines and carboxylic acids with distillation of reaction water and impurities is characterized by the fact that, as polypropylene polyamine, pentapropylene hexamine [(3,6,9,12,15-pentamethyl)-1,4,7,10,13,15-hexamino-hexadecane] is used, which reacts with monocarboxylic acid first at a temperature of 160-165°С for 4-6 hours, then at a temperature of 255-265°С for 2-2.5 hours in a molar ratio of pentapropylene hexamine : monocarboxylic acid equal to 1 : 2-2.05, followed by the interaction of the obtained bis-imidazoline with ethylene oxide at a temperature of 20°С in a molar the ratio of bis-imidazoline based on pentapropylene hexamine : ethylene oxide, equal to 1:2.
EFFECT: invention expands the raw material base and the range of products.
1 cl, 1 tbl, 2 ex
