采用连续油管氮气辅助返排技术,将井底聚合物溶液举升到地面,能够进行取样试验并直接测试地层中聚合物溶液的粘度和浓度.试验结果表明:在目前海上注水井完并条件下,聚合物溶液进入地层发生了降解,地层粘度约为地面粘度的1/3;长期注入聚合物会使部分未溶物在井筒内部堆积,形成凝胶状物.本文研究结果为聚合物驱数模研究和施工设计提供了第一手资料,也为进一步开展聚合物驱技术的应用奠定了基础.%The down hole polymer solution was lifted to the ground by coiled tube with the nitrogen assistant flowback technique, by which the down hole polymer solution sampling investigation was carried out, and the concentration and viscosity of the polymer solution could be measured directly in the down hole. It is revealed that the polymer solution have been degraded after entering the formation under the current conditions of completed water injection wells, with the viscosity of polymer reduced to the one-third of injected one. The undissolved polymer has been accumulated along with the polymer flooding period, and plenty of gel was formed. The study has provided the first hand parameters for the construction design and the numerical simulation of polymer flooding, and also laid the foundation for further application of polymer flooding.
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