Patent ID: 7704926
Filing Date: 2010-04-27
Classification: B01F,C07C,C09K

Abstract:
1. A wellbore service fluid, comprising: an aqueous viscoelastic composition that comprises cleavable surfactant, the cleavable surfactant comprising a reverse amide surfactant or a reverse ester surfactant and having the structure of formula 1, formula 2 or formula 3: or or where (i) R 1 is a saturated or unsaturated, linear or branched aliphatic chain of at least 18 carbon atoms; (ii) X is an —, or R (iii) m is at least one; (iv) Y (v) R (vi) A (vii) Z wherein: the cleavable surfactant is cleavable at the group X into breakdown products that are soluble in oil or water and include the alcohol R the cleaving of the cleavable surfactants into the oil or water soluble breakdown products removes viscoelastic and viscosifying properties of the wellbore service fluid and reduces potential for the wellbore service fluid to form emulsions.