The present application concerns a water-in-oil inverse emulsion comprising: oil; water; at least one water-soluble anionic polymer of average molecular weight higher than 3 million daltons, containing between 4 and 14 mol % of sulfonated anionic monomers, between 0 and 17 mol % of carboxylated anionic monomers and between 69 and 94 mol of nonionic monomers; at least one inverting agent and at least one emulsifying agent, the weight ratio R between the total amount of inverting agent and the total amount of emulsifying agent being higher than 1.8; the inverting agent being selected from among an ethoxylated nonylphenol preferably having between 4 and 10 ethoxylations; an ethoxylated/propoxylated alcohol preferably having ethoxylations/propoxylations to obtain a total number of carbons of between C12 and C25, an ethoxylated tridecylic alcohol and an ethoxylated/propoxylated fatty alcohol; the emulsifying agent being selected from among sorbitan monooleate, polyethoxylated sorbitan esters or the diethanolamide of tall oil fatty acids, polyethoxylated fatty acids, and use thereof for hydraulic fracturing.