关键词: 一次聚合物驱, 二次聚合物驱, 注入参数, 驱替液与原油黏度比, 提高采收率, 聚合物注入时机

Abstract: The influences of oil-to-polymer viscosity ratios in the primary and secondary polymer flooding on the enhanced oil recovery(EOR) in thin or heavy oil reservoirs were researched systematically.The reasonable range of oil-to-polymer viscosity ratio was optimized.The result shows that the increment of EOR gets larger with the increase of the oil-to-polymer viscosity ratio under the condition of the same crude oil viscosity,and the increment of EOR is unconspicuous while the viscosity ratio reaches to a certain value.The increment of EOR in the secondary polymer flooding is obviously lower than that in the first polymer flooding under the condition of same oil-to-polymer viscosity ratio.Higher oil-to-polymer viscosity ratio would be needed to reach the value of the primary polymer flooding.The earlier injection of polymer would get the better effect in the secondary polymer flooding.A theoretical plate could be used to check rationality of the injection parameters in the field and to provide basis for designing the reasonable injection parameters in the primary and secondary polymer flooding.

Key words: primary polymer flooding, secondary polymer flooding, injection parameter, oil-to-polymer viscosity ratio, enhanced oil recovery, timing of polymer injection