Rheokinetics of organic zirconium crosslinked AM/DMAM/AMPS terpolymer

A high temperature resistant polymer gel with lactic acid/ glycerine organic zirconium as crosslinking agent and a polymer [a kind of acrylamide(AM)/N,N-dimethyl acrylamide(DMAM)/2-acrylamide-2-methyl propane sulfonic acid(AMPS) terpolymer of high temperature resistance] as thickening agent was prepared. The rheological properties(viscoelasticity and thixotropy) and crosslinking rheokinetics of the polymer gel were studied. The changes of viscosity and viscoelastic modulus with time in the crosslinking process were obtained. The effects of shear rate and temperature on gel formation were investigated and a crosslinking rheokinetics model was established. The polymer gel had obvious viscoelasticity and thixotropy. Viscosity was maintained at 176.8 mPa·s after the crosslinked polymer gel was sheared at 170 s-1 for 120 min at 180℃. The high temperature resistant fracturing fluid gel which could endure 180℃ was obtained. The first order rheokinetics model would well describe the rheokinetics of polymer crosslinking process and the model parameters could have well-defined and reasonable significance.