Abstract:

The agitated flow field of polymer solution，which has been widely used to enhanced oil recovery in China，was measured by using particle image velocimetry（PIV）. It was found that because the polymer solution has the properties of significant viscoelasticity，low transparency and irreplaceability by any clear liquid，the camera in PIV system could not shoot the distanced images of tracer particle in polymer solution at the concentration above 1000 mg/L，even with greater size tracer particle and higher laser intensity. The flow field stirred by double helical ribbon and screw impeller in the polymer solution at the concentration of 1000 mg/L and 500 mg/L showed axial circulation characteristics，unlike the flow field agitated by disk or sphere in polymer solution which showed reverse secondary flow. In laminar region，the agitation speed and solution concentration had little effect on the whole circulation flow feature in stirred tank. Research in this paper indicated that double helical ribbon screw impeller was suitable for agitating and mixing the polymer solution.

摘要：

采用粒子图像成像仪（PIV）对广泛应用于我国油田驱油用的聚合物溶液搅拌流场进行了测试。研究过程发现，由于聚合物溶液具有黏弹特征、透明度较差、其它透明物系又无法替代的特点，采用较大颗粒的示踪粒子、激光光强为400 mJ时，PIV仪器相机仍不能拍摄到浓度高于1000 mg/L聚合物溶液中示踪粒子的清晰图像；双螺带螺杆搅拌桨在浓度为1000 mg/L和500 mg/L聚合物溶液中的搅拌流场并没有像圆盘和圆球一样出现反向二次流现象，而是呈轴向大循环特征；在层流区域内，搅拌转速以及溶液浓度对搅拌槽内整体大循环特征影响不大；研究表明双螺带螺杆搅拌桨应用于聚合物溶液的搅拌混合是合适的。