聚丙烯酰胺水溶液的流变性和粘弹性的研究

A study on the rheological properties and viscoelasticity of PAM aqueous solutions

描述了用于聚合物驱油的聚丙烯酰胺(PAM)水溶液的流变性和粘弹性,利用低剪切旋转流变仪(Low Shear 40)和控制应力流变仪(AR-100),测定了不同浓度,在不同温度下的PAM水溶液的粘弹性和流变性,实验表明,在振荡频率作用下,PAM水溶液具有粘弹性,其实数粘度(η’),实数模量(G’)和损耗正切(tgθ)都受PAM浓度(C)、温度(T)影响。对于低浓度PAM水溶液,表现为牛顿性流体,超过一个临界浓度(C*)以上,PAM水溶液表现为假塑性流体。对于一个假塑性流体,它仍然有两个牛顿区,即在极低和较高的剪切速度率(γ)下表现为牛顿流体的特征。上述结论为三次采油提高石油采收率的研究提供了理论依据.

The rheological properties and viscoelasticity of polyacrylamide aqueous solutions used in polymer plooding are described. A low shear rotational rheometer (Low Shear 40) and a controlled stress rheometer (AR-1000) were used to determine the viscolelasticity and rheological properties of PAM aqueous solutions with different PAM concentrations at different temperatures. Experimental data show that under the action of vibration frequency, PAM solutions possess viscoelasticity, its real number viscosity (η'), real number modulus (G') and loss tagent (tgθ) are all affected by the concentration (C) and temperature (T) of the PAM aqueous solution. Low concentration PAM aqueous solutions behave as Newtonian fluids, but PAM aqueous solutions with concentrations exceeding critical concentration (C*) behave as pseudoplastic fluids. For a pseudoplastic fluid, it still has two Newtonian areas: it shows Newtonian fluid characteristics at very low and rather high shear rates (γ). Above conclusions provide theoretical basis for tertiary enhanced oil recovery research.