ANIONIC-CATIONIC-NONIONIC SURFACTANT, METHOD OF ITS OBTAINING AND APPLICATION Russian patent published in 2018 - IPC C09K8/584 E21B43/22 

FIELD: biochemistry.

SUBSTANCE: present invention relates to an anionic-cationic non-ionic surfactant for oil production. Anionic-cationic non-ionic surfactant – ACNIS – for oil production is one or more compounds, represented by the given formula with an indicated type and combination of radicals. Method for producing the above mentioned ACNIS includes steps of reacting said multifunctional compounds with one or more of said alkylene oxides in the presence of an alkaline catalyst to form an ether, reacting the resulting ester with said quaternizing agent under said conditions. Composition of tertiary oil recovery fluid for oil production of oil includes the above-mentioned ACNIS or ACNIS, obtained in the above-mentioned manner, and water, wherein the ACNIS content is 0.001–19 % by weight based on the total weight of the composition of said fluid. Method for producing tertiary oil recovery fluid for tertiary oil recovery method comprises mixing the above or obtained by the above-mentioned method ACNIS with at least water, wherein the ACNIS content is 0.001–10 % by weight, based on the total weight of said tertiary oil recovery fluid composition. Tertiary method of oil recovery includes a step of said production in the presence of the above-mentioned ACNIS or the above-mentioned or obtained by the above-mentioned tertiary oil recovery fluid composition method for tertiary method of oil recovery. Invention is developed in dependent items of the formula.

EFFECT: technical result is increase of efficiency of oil displacement and the ability to wash oil.

13 cl, 33 ex,40 ex,16 tbl