Study and performance evaluation of an organic acid fracturing fluid

The acid fracturing fluid system was developed for low permeability,alkaline sensitivity reservoir using organic zirconium as crosslinking agent,carboxymethyl hydroxypropyl guar gum as thickening agent.The performance of fracturing fluid was evaluated.The results showed that when the concentration of thickening agent was 0.4%,crosslinking ratio was 100∶ 2,gel breaking agent amount was 0.06%,the viscosity of gel breaking agent was 1.013 mPa·s,the residue content was 261 mg/L,the preventing expansion rate was 90.5%,the surface tension was 27.6 mN/m,the average corrosion inhibition rate was 0.826 g/(h·m2).The filtration rate was 0.575×10-5 m/min0.5 at 90 ℃,the damage rate for reservoir was less than 15%.