矿化度对有机铬/HPAM弱凝胶的成胶及流变性的影响

Effects of Salinity on Gelation Behavior and Rheological Properties of Organic Chromium/HPAM Weak Gels

赵晓非 章磊 杨明全 刘立新 佘庆龙

ZHAO Xiaofei ，ZHANG Lei，YANG Mingquan，LIU Lixin ，SHE Qinglong

为获得矿化度对有机铬/HPAM弱凝胶的成胶行为和流变性的影响规律，采用布氏黏度计和RS150 流变仪分别研究了有机铬/HPAM弱凝胶成胶时间、凝胶强度、剪切性能和黏弹性随矿化度变化的规律。研究结果表明，相同成胶条件下，随矿化度增大，弱凝胶成胶时间加快、黏度增大，矿化度在2371.14～3084.60 mg/L范围能延缓成胶，达到3449.44 mg/L时成胶时间明显变短。剪切作用对稳定期的弱凝胶产生不可逆的破坏，低剪切速率下，矿化度高的弱凝胶表现较高的黏度；而在高剪切速率（≥21 s-1）下，不同矿化度下的弱凝胶的剪切黏度均相差不大。储能模量（G'）和损耗模量（G'' ）均随矿化度增加而增大，矿化度高时弱凝胶以弹性占导，矿化度低则以黏性为主。图7 表2 参11

For organic chromium/HPAM weak gels，salinity（＜5000 mg/L）of NaHCO3 type oilfield wastewater has a huge impact on its gelation time and strength. The effect of salinity on the performance of organic chromium/HPAM weak gels，such as gelation time，gel strength，shear properties and viscoelastic were investigated by brookfield viscometer and RS150 rheology instrument. The experimental results showed that under the identical gelation condition，the gelation time shortened and the viscosity of weak gels raised as salinity increased. Salinity ranging from 2371.14 mg/L to 3084.60 mg/L had a significant delay effect on gelation， while the acceleration arose when salinity was beyond 3449.44 mg/L. Damage of shear on weak gel was not reversible. The weak gel with high salinity had higher viscosity at a low shear rate，while the viscosity with different salinity was similar at a high shear rate（≥21 s-1）. Storage modulus G' and loss modulus G'' of the weak gels increased with the increase of salinity. Elastic of weak gel were dominant at high salinity，while viscous became dominant at low salinity.

10.19346/j.cnki.1000-4092.2016.03.011