Novel aqueous fracturing fluid composition and fracturing process using the composition

A fracturing fluid comprising a proppant and an associative amphoteric polymer, the said polymer comprising:

• 0.01 to 10 mol % of at least one cationic monomer containing a hydrophobic chain;
• from 0.09 to 89.99 mol % of at least one anionic monomer;
• and from 10 to 99.9 mol % of at least one nonionic water-soluble monomer;
• the total amount of monomer being 100 mol %,
• wherein the at least one cationic monomer containing a hydrophobic chain has general formula I:
• in which:
• R1 is an alkyl or arylalkyl chain of 16 to 18 carbons,
• X is a halide chosen from the group consisting of bromide, chloride, iodide, fluoride, and a counterion of negative charge.