Abstract: 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.

Key words: organic zirconium, high temperature resistant gel, polymer, rheology, kinetics

摘要： 以乳酸/丙三醇有机锆为交联剂,聚合物[一种耐高温的丙烯酰胺(AM)/N,N-二甲基丙烯酰胺(DMAM)/2-丙烯酰胺基-2-甲基丙磺酸(AMPS)三元聚合物]为稠化剂,获得了耐高温聚合物凝胶.研究了聚合物凝胶的流变学特性(黏弹性、触变性)及其交联流变动力学,获得了聚合物交联过程中黏度、黏弹性模量随时间的变化关系,并考察了剪切速率和温度对凝胶形成的影响,建立了交联流变动力学模型.结果表明,交联聚合物凝胶具有明显的黏弹性和触变性;在180℃、170 s^-1下剪切120 min后,黏度达176.8 mPa·s,获得了耐高温达180℃的凝胶;一级交联流变动力学模型可拟合聚合物的交联流变动力学过程,拟合的模型参数物理意义明确合理.

关键词: 有机锆, 耐高温凝胶, 聚合物, 流变学, 动力学