Evaluation method of early polymer injection effect in offshore oilfields considering nonNewtonian behavior of polymer and additional seepage resistance
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Abstract
Due to the early polymer flooding time and short water flooding stage in offshore oil fields, traditional hall curve cannot evaluate the effectiveness of early polymer flooding. According to the seepage mechanism, considering the non-Newtonian behavior of polymer solution and the additional seepage resistance, an improved Hall Curve suitable for evaluating the early polymer injection effect is established. According to the slope and intercept of improved Hall curve which was drawn up using practical data of an injection well, the flow behavior index, the average effective viscosity within polymer-swept portion, the flow coefficient and the resistant coefficient of underground polymer solution at any time could be calculated. It can be used to evaluate the underground fluid changes and the effectiveness of early polymer flooding. The theoretical calculation results are verified by experiments, and the results are reliable, which provides a basis for the evaluation of early polymer injection effect in offshore oil fields.
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