Dynamic adjustment technology to improve polymer flooding effect of Ⅱ reserves

The main body of tertiary oil recovery in Henan oilfield is type Ⅱ reserves, which is characterized by high recovery degree, high integral water cut and low efficiency of polymer flooding. In order to change the present situation, dynamic adjustment technology aiming at enhancing efficiency, thickness and scale has been carried out. Therefore, six countermeasures to improve development effect of type II reserves have been established, namely reasonable liquid supply and filling system technology, edge water control technology, concentration variation adjustment technology, channeling technology, sealing high water cut layers evaluation technology and lifting fluid technology. The application of these technologies has obvious effect and can provide experienced guidance for the development of others of the similar kinds.