HYDRAULIC FRACTURING EMULSION Russian patent published in 2024 - IPC C09K8/35 C09K8/68 E21B43/26 

FIELD: mining.

SUBSTANCE: group of inventions relates to reduction of friction of fluid for hydraulic fracturing in hydraulic fracturing operation. Reverse emulsion "water-in-oil" for reducing friction of fluid for hydraulic fracturing contains oil; water; at least one water-soluble anionic polymer with an average molecular weight of more than 3 million daltons, containing from 4 to 14 mol.% of sulphonated anionic monomers, from 0 to 17 mol.% of carboxylated anionic monomers and from 69 to 96 mol.% of non-ionic monomers; at least one inverting agent and at least one emulsifying agent, wherein the weight ratio R between the total amount of the inverting agent and the total amount of the emulsifying agent is higher than 1.8. Inverting agent is selected from ethoxylated nonylphenol; ethoxylated/propoxylated alcohol; ethoxylated tridecyl alcohol and ethoxylated/propoxylated fatty alcohol. Emulsifying agent is selected from sorbitan monooleate, polyethoxylated sorbitan esters, diethanolamide of tall oil fatty acids or polyethoxylated fatty acids.

EFFECT: reduced friction in conditions of high salinity with high content of divalent salts.

18 cl, 2 tbl, 11 ex