Abstract
In order to improve the traditional foam stability, a kind of polymer enhanced foam was proposed to enhance oil recovery in Gan’guyi oilfield. Based on experiments, the polymer concentration of 1,500 ppm was firstly determined by measuring the foam volume and half-life time. The investigation of the effect of polymer on foam plugging ability proved that polymer enhanced foam has excellent plugging capacity both with and without oil. The oil displacement experiments showed that polymer enhanced foam flooding increased oil recovery by 40.6% after waterflooding and the total recovery could reach 79.2%, which was 20.7% higher than that of traditional foam flooding, indicating polymer enhanced foam has excellent oil displacement performance.
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