不同尺寸段塞组合等流度二元驱驱油效果评价

辽河油田锦16块实施二元复合驱以来,仍存在部分注入井单层吸液量过大,使注入液在各层中的推进速度不一致,从而导致相应的采油井聚合物质量浓度上升较快的问题。通过室内驱替实验,采用均质岩心和非均质岩心,对比不同段塞组合的等流度二元驱驱油方法在非均质岩心上的驱油效果。结果表明,在相同聚合物用量和总注入孔隙体积倍数条件下,在三层非均质岩心上等流度驱油方法比常规单段塞驱油方法化学驱采出程度高出3.54%;多段塞等流度驱油方法可以明显提高中、低渗层分流率,降低高渗层分流率。因此,合理段塞组合等流度二元驱油方法可有效提高高渗透非均质油藏的采收率。

Evaluation of SP Flooding Effect of Different Size Slug Combination with Equi-Mobility

Since the implementation of SP Flooding in Jin 1 6 block of Liaohe oilfield,there are still some problems existing in some inj ection wells.For example,the monolayer liquid absorption amount is too large and front advance velocity in each layer is not uniform,which resulted in the faster rising of polymer concentration in production wells.In order to evaluate the SP flooding effect of different size slug combination with equi-mobility, SP flooding experiments were conductedusing homogeneous and heterogeneity core.The results showed that the oil recovery of Equi-mobility Displacement method was 3.54% higher than the conventional single slug SP flooding when the polymer and surfactant were used with the same dosage. Equi-mobility the diversion rate of the medium and low permeability layer can be obviously improved when the displacement method was uesd.Conversely,the high permeability layer was reduced.Therefore,a reasonable combination of different size equi-mobility SP slug can effectively improve the oil recovery efficiency of the heterogeneous core.