Fe2+对HPAM驱油剂流变性能影响研究

针对目前海上油田聚合物驱入井液黏度损失问题，分析了聚合物溶液黏度损失的原因，重点研究了Fe2+浓度对聚合物流变性能的影响。通过室内实验分别考察了溶液中不同Fe2+浓度对聚合物的特性黏数、黏弹性和拉伸流变性的影响规律。实验结果表明:当Fe2+浓度小于0.5 mg/L 时，随着Fe2+浓度增大，聚合物的特性黏数、表观黏度和拉伸黏度呈迅速下降趋势；当Fe2+浓度大于0.5 mg/L时，降解不明显。控制注入水中Fe2+浓度低于0.5 mg/L，可以有效消除Fe2+对聚合物入井液黏度的不利影响。

Study of the effect of Fe2+ on rheological behavior of HPAM

In view of serious viscosity losses of the fluid solution into wells in the process of polymer flooding, the paper analyzed the reasons of the loss of polymer solution viscosity, mainly about the influence of Fe2+ concentration on polymer rheological properties. We respectively studied the influencing laws of different Fe2+ concentration in the solution to polymer intrinsic viscosity, viscoelasticity and tensile rheological property. The results showed that when Fe2+ concentration was under 0.5 mg/L, HPAM solution intrinsic viscosity, apparent viscosity and stretching rheological property were greatly reduced with the increase of Fe2+ concentration, while the influence trend slowed down gradually when Fe2+ concentration was over 0.5 mg/L. Thus, Fe2+ concentration of the injected water should be controlled under 0.5 mg/L, which can effectively eliminated the adverse impact of Fe2+ on the polymer solution viscosity.