THICKENER OF AN AQUEOUS ACID SOLUTION, A METHOD OF THICKENING AN AQUEOUS ACID SOLUTION AND AN OIL RECOVERY METHOD USING SAID THICKENER, A SET OF COMPONENTS FOR THICKENING AN AQUEOUS ACID SOLUTION AND A COMPOSITION FOR CARRYING OUT ACIDIC HYDRAULIC FRACTURING OF THE FORMATION, INCLUDING SAID THICKENER Russian patent published in 2019 - IPC C09K8/35 C09K8/74 E21B43/27 

FIELD: chemistry.

SUBSTANCE: group of inventions is referred to thickening of acid solutions and use of suspended solutions of acids for hydraulic fracturing of formation. To thicken the aqueous acid solution, a combination of a) polyethoxylated tall amine of formula

is used, where m and n = 2 and R is a fatty acid precipitate selected from the group consisting of oleic, palmitic, stearic, myristic or linoleic acid; b) a compound selected from a group consisting of: a quaternary ammonium salt of formula

,

where R is a saturated, mono-, di- or tri-unsaturated hydrocarbon radical C_9–25; R₁ is hydrogen, methyl, ethyl, propyl, isopropyl, allyl, vinyl, phenyl and benzyl; R₂, R₃, R₄, R₅ independently represent hydrogen, methyl, ethyl, propyl, isopropyl, allyl, vinyl, phenyl or benzyl; A is halo-, nitro- or perchlorate; or a zwitterion compound of formula

,

where R₁ is -COO^- or -CH₂COO^- and R, R₂, R₃, R₄, and R₅ such as defined above; c) optionally an iron converter.

EFFECT: technical result is higher efficiency of propant transport, higher efficiency of extraction of hydrocarbons from formation, use for treatment of one working liquid – acid gel, if necessary containing propant.

22 cl, 7 dwg, 4 tbl, 7 ex