Abstract: When polymer solution is injected into reservoir, if the radius of polymer molecule thread is much larger than the radius of pore throat, it will cause the blockage of polymer in reservoir pore. Selecting a typical block in Sabei oil field, sampling the blocked injection wellbore backflow, and analyzing the composition of backflow by laboratory, it is determined that the main component of backflow blockage is polymer soft micelle. According to the geological structure, sedimentary facies, reservoir property of geological data, the geological model of plugging wells was establish，the concentration of polymer distribution in the reservoir was utilized, the polymer solution flowing trajectory was simulate and the distance of the polymer blockage was confirm. The advancing distance of direction provides a basis for improving the blocking condition of injection wells and taking pertinent measures.

Key words: Polymer blockage, Flowing trajectory, Data simulation

摘要： 聚合物溶液在注入油层的过程中，如果聚合物分子线团回旋半径远大于油层孔喉半径，会造成聚合物在储层孔隙的堵塞。选取萨北开发区典型区块，对堵塞的注入井井底返排取样，通过化验分析返排物成分，确定井底返排堵塞物的主要成分是聚合物软胶团。根据油层物性、沉积特征、连通状况等地质资料建立聚合物堵塞井井组地质模型，模拟超高分子质量、高质量浓度聚合物溶液在油层中的推进轨迹，利用聚合物质量浓度在油层渗流过程中分布的渐变，确定聚合物堵塞物在不同油层、不同方向的推进距离，为改善注入井堵塞状况，采取针对性的措施提供了依据。

关键词: 聚合物堵塞物, 推进轨迹, 数值模拟