The Research and Application on Fracturing Technology of Online Preparation for Polymer Fracturing Fluid

In recent years, the measure of fracturing fluid blending was adopted prior to operation. The traditional form of fluid blending not only has the problem of long operation cycle and high strength of fluid blending and so on, but also has difficult disposal of flowback waste fluid and reservoir damage. For avoiding the disadvantages of traditional fluid blending, the online preparation for polymer fracturing fluid (OPPFF) is developed to replace the traditional melon gum system for preparing fracturing fluid continuously on-line. Laboratory e-valuation results show that the viscosity of OPPFF is above 60 mPa.s after 90min shearing at 120 degrees C and 170 s(-1), which could meet the requirements of conventional fracturing. Low molecular polymer emulsion, multifunction additive and ammonium persulfate are pumping into sand blender by metering pump, then mixed with water and propping agent to finish the fluid blending process with 50% sand ratio. It has strengths such as easy preparation, less waste of materials, low reservoir damage and no pollution, and obtains a high efficient and environment protected fracturing operation. The application results are desirable and it has prosperous future for dissemination.