耐温抗盐驱油聚合物溶液黏弹性

对3种不同结构类型的耐温抗盐驱油聚合物〔高分子量聚丙烯酰胺(HPAM)、磺化聚丙烯酰胺(S-HPAM)和疏水缔合聚丙烯酰胺(A-HPAM)〕的溶液黏弹性能进行了研究。在温度85℃下,通过稳态剪切和动态剪切试验,考察了质量浓度和矿化度对聚合物溶液黏弹性的影响。结果表明,随剪切速率增加,溶液表观黏度逐渐降低。质量浓度越高,溶液的储能模量(G')和损耗模量(G″)越大。由动态剪切实验数据,计算得到第一法向应力差(N1)。随质量浓度增加,聚合物溶液的N1逐渐增大;随矿化度增加,聚合物溶液的N1出现不同盐敏感区域,说明不同结构类型的驱油聚合物溶液对矿化度的弹性响应不同。研究结果为高温高盐油藏聚合物驱剂的选择及开发提供了理论参考。

Viscoelasticity of Temperature-Tolerant and Salt-Resistant Flooding Polymer Solutions

The effects of mass concentration and salinity on the viscoelasticity of three temperature-tolerant and salt-resistant flooding polymers(high molecular mass polyacrylamide(HPAM), sulfonated polyacrylamide(S-HPAM) and hydrophobic associating polyacrylamide(A-HPAM)), were investigated through the dynamic and steady state shear test at 85 ℃. The results show that the higher the mass concentration, the higher the storage modulus(G') and the loss modulus(G″). The apparent viscosity of polymer solutions decreases with the increase of the shear rate. The normal stress difference(N₁) of polymer solutions was calculated by using dynamic experimental data. With the increase of the solution concentration, N₁ gradually increases. With the increase of salinity, N₁ appears different salt sensitive areas, which shows that elastic responses of polymer solutions to salinity are different. The study provides the theoretical reference for the choice and development of flooding polymers of high temperature and high salt reservoir.