One of the challenges for polymer application in offshore oilfield is the treatment of the produced fluids containing polymer. It would be extremely difficult to deal with when the injected polymer is produced in large volume on the platform. A practical example was illustrated in this paper. JZ west area, one offshore oilfield in Bohai Bay, has been implemented polymer flooding since 2007. In this field, incremental oil and reduced water cut were observed, as the concentration of the produced polymer rised to such a high level that nearly leading to a treatment failure on the platform.

In this paper, reasons of the polymer cross flow are analyzed, and methods to control the cross flow of the polymer solution in the pilot were described. The study shows that separate layer injection and in depth profile control are effective measures to improve the vertical sweep efficiency of the injected agent.

After the measures were applied in the field, the produce polymer concentration has been reduced and the treatment procedure resumed to normal.

It is showed that prevention of cross flow in advance is extremely important for offshore oilfields. This paper gave a practical experience for polymer application in offshore environment.

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