Fluid Loss Control in Viscoelastic Surfactant Fracturing Fluids Using Water Soluble Polymers

A method for treating a subterranean formation comprising:

• injecting an aqueous viscoelastic surfactant treating fluid through a wellbore and into the subterranean formation, where the aqueous viscoelastic treating fluid consists essentially of:
• an aqueous brine base fluid;
• a viscoelastic surfactant (VES) gelling agent;
• and
• from about 5 to about 60 pptg (about 0.6 to about 7.2 kg/m3) based on the aqueous viscoelastic treating fluid of a water soluble uncrosslinked polymer fluid loss control agent selected from the group of polysaccharides consisting of guar gum;
• hydroxylpropyl guar (HPG);
• carboxymethyl guar (CMG);
• carboxymethylhydroxypropyl guar (CMHPG);
• hydroxyethylcellulose (HEC);
• carboxymethylhydroxyethylcellulose (CMHEC);
• propylene glycol alginate;
• salts of alginates;
• salts of iota, kappa, and lambda carrageenan;
• agar-agar;
• xanthan gum;
• gum tragacanth;
• locust bean gum;
• karaya gum;
• gum arabic;
• starch;
• and mixtures thereof;
• and
• treating the subterranean formation.

A method for treating a subterranean formation comprising:

• injecting an aqueous viscoelastic pad fluid through a wellbore and into the subterranean formation, the pad fluid comprising:
• a first aqueous base fluid;
• and
• a first viscoelastic surfactant (VES) gelling agent;
• and
• injecting an aqueous viscoelastic surfactant treating fluid through a wellbore and into the subterranean formation, the treating fluid comprising:
• a second aqueous base fluid;
• and
• a second viscoelastic surfactant (VES) gelling agent;
• where the first aqueous base fluid and the second aqueous base fluid may be the same or different;
• where the first VES gelling agent and the second VES gelling agent may be the same or different;
• and
• where at least one of the fluids selected from the group consisting of the pad fluid and the treating fluid contains a water soluble uncrosslinked polymer fluid loss control agent in the absence of a water soluble crosslinked polymer fluid loss control agent.

An aqueous viscoelastic treating fluid comprising:

• an aqueous base fluid;
• a viscoelastic surfactant (VES) gelling agent;
• and
• an uncrosslinked polymer fluid loss control agent in the absence of a water soluble crosslinked polymer fluid loss control agent.