Reverse emulsion for hydraulic fracturing

Abstract

The present application relates to a water-in-oil reverse emulsion comprising an oil; water; at least one water-soluble cationic copolymer with an average molar mass of more than 3 million daltons, containing between 18 and 32 mole % of cationic monomers and 68 and 82 mole of nonionic monomers; at least one reversing agent and at least one emulsifying agent, the weight ratio R of the total amount of reversing agent to the total amount of emulsifying agent being greater than 1.8, the reversing agent being selected from an ethoxylated nonylphenol, preferably having between 4 and 10 ethoxylations; an ethoxylated/propoxylated alcohol, preferably having ethoxylations/propoxylations so as to have a total carbon number between C12 and C25, an ethoxylated tridecyl alcohol and an ethoxylated/propoxylated fatty alcohol. the emulsifying agent being selected from sorbitan monooleate, polyethoxylated sorbitan esters or diethanolamide of tall oil fatty acids, and its use in hydraulic fracturing.

Dependencies are inferred from the claim text.