BREAKING DIUTAN WITH OXALIC ACID AT 180 °F to 220 °F

摘要

A method of treating a portion of a well of a well is provided. The method includes the step of forming a treatment fluid comprising: (i) a continuous aqueous phase; (ii) a viscosity-increasing agent selected from the group consisting of diutan, clarified diutan, water-soluble derivative of diutan, and any combination thereof, wherein the viscosity-increasing agent is dissolved in the aqueous phase; and (iii) a breaker comprising oxalic acid, wherein the oxalic acid is dissolved in the aqueous phase. The viscosity of the treatment fluid breaks to less than 3.0 cP in less than 72 hours when in a temperature range of 180 F (82.2 C) to 220 F (104.4 C). The method also includes the steps of introducing the treatment fluid into the portion of the well and flowing back from the portion of the well.