anionic polyacrylamide emulsion used for fracturing thickener
In order to reduce the friction of fracturing construction and increase the pumping capacity, polyacrylamide fracturing fluid drag reducer was synthesized by inverted emulsion polymerization using acrylamide, sodium 3-propenyl-2-hydroxy-1-propane sulfonate and octateacrylate as raw materials. The structure and morphology of the product were characterized by Fourier infrared spectroscopy and scanning electron microscopy. The properties of drag reduction, solubility, shear resistance, viscoelasticity and compatibility of the fluid were investigated. The experimental results showed that the polyacrylamide emulsion was synthesized successfully. The solid content of the emulsion was 29.6%, the molecular weight of the emulsion was 8.5×105g/mol, and the emulsion viscosity was 1800mPa.s. When the shear rate is 6.8m/s, the dissolution time of emulsion is 48s. When the shear rate is 10m/s and the shear time is 300s, the drag reduction rate remains at 70%, and the shear resistance is good. At room temperature, when the shear rate is 10m/s and the mass fraction is 1g/L, the drag reduction rate of fracturing fluid drag reduction agent is 78%. With the increase of the mass fraction of drag reduction agent, the drag reduction rate first increases gradually and then maintains a balance. The viscoelastic test shows that the polymer is a fluid of viscoelastic structure. When the shear frequency is 1Hz and the stress change is 5%, the energy storage modulus of the system is greater than the energy dissipation modulus and remains stable. When the shear rate is 10m/s, the mass fraction is 1g/L, the temperature is 80℃ and the salinity is 20 00mg/L, the resistance reduction rate of the polymer is 53%, and the discharge aid and clay stabilizer have no effect on the resistance reduction agent.