定位调堵-泡沫复合驱替技术增产效果及其影响因素分析

陆相沉积疏松砂岩地层非均质性强,经过长期水冲刷后,非均质性进一步增强,泡沫由于自身特性在一定程度上可以调整吸液剖面;但对于非均质强的地层,泡沫在窜流通道中突进,造成无效驱替,因此需要与调剖技术组合应用。利用三层非均质岩心模拟高渗透率强非均质性油藏,研究调剖泡沫组合技术在不同渗透率级差、不同调剖时机条件下的增产效果。实验结果表明,渗透率级差为40时,组合体系仍然具有很好的采出效果;调剖时机对增产效果影响较小,研究思路和结果优化了调剖泡沫组合技术,为现场降水增油措施和提高采收率方案制定提供参考依据。

Study on improved production effect and influencing factor analysis of combined displacement technique of positioning profile control and foam

The heterogeneity of continental sedimentary loose sand reservoir is severe. The heterogeneity is further intensified after long-term water erosion. Foam, due to its own special characteristics, can adjust the liquid suction profile to a certain extent. But for the severely heterogeneous formation, the foam broke through the fluid channeling, causing invalid displacement. So the combined technology of profile control and foam is needed. Three layer heterogeneous core is used to simulate the reservoir with high permeability and strong heterogeneity. In this paper, enhanced production effect of this combined technology is investigated under the condition of permeability contrast and profile control opportunity. The experimental results show that when the permeability contrast is 40, the combined system still has good production effect; Profile control position has larger effect on the production performance, while profile control opportunity has smaller effect on the production performance. The ideas and results of this paper can optimize the combined technology of profile control and foam, providing the reference for programming to increase oil, cut water and improve oil recovery.