机械剪切对缔合聚合物溶液结构的影响

Effects of mechanical shear on associative polymer solution microstructure

朱洪庆 陈士佳 王成胜 宋爱莉 王京博 黄波

中海油能源发展股份有限公司钻采工程研究院，天津　300452

CNOOC Energy Technology &

由于缔合聚合物在水溶液中黏度形成机理与水解聚丙烯酰胺不同，为了研究缔合聚合物驱油剂在配注过程中由于机械剪切作用发生的黏度损失，结合动态激光散射法、芘探针荧光光谱法、原子力显微镜观测等分析方法，研究机械剪切对缔合聚合物溶液的影响规律。研究结果表明，缔合聚合物溶液在受到机械剪切作用初期，黏度、黏均分子量、水化粒子体积均有明显损失；溶液中缔合微区数量随着剪切作用时间的增加而降低；剪切后放置24 h可使缔合微区数量有少量恢复，但无法恢复到到剪切前水平；缔合聚合物溶液剪切前后均存在网络结构，剪切后粒子体积和粒子间联系部分尺寸都有明显减小。因此剪切作用不仅使缔合聚合物分子结构破坏，也破坏了溶液中的缔合结构，并且缔合结构难以恢复，最终造成了溶液黏度的降低。

Since the associative polymer has different solution viscosity forming mechanism with that of HPAM. In this paper, in order to analyze the viscosity loss caused by mechanical shear during associative polymer oil-displacement agent injection allocation process, the effects of mechanical shear on associative polymer solution are studied by combining dynamical laser scattering method, pyrene fluorescence probe spectrometry and atomic force microscopy （AFM）. Studies show that the apparent viscosity, viscosity-average molecular weight and hydrated particle dimension of associative polymer solution decease obviously at the very start of mechanical shearing action. With the increasing of shearing action, numbers of association particles during micro area in the solution is decreasing, but appears slightly recovery after the solution was placed 24 hours, never restores to the previous state. The number of micro-association-area is reduced with the increase of shearing time. Through AFM, the network structures are observed both in the associative polymer solution before and after shearing action and also observed that the hydrated particle dimension and the connections between the particles degrade after shearing. It can be concluded that both the associative polymer molecular chains and association structures damage in the course of shearing action, and because of difficulty of recovery, solution viscosity is fall.