强化分散体系提高采收率影响因素研究

Study on the Influencing Factors of Enhancing Oil Recovery by Enhanced Dispersion System

根据渤海地区稠油油田储层地质和流体特征以及现阶段开发现状,以BZ25-1S油田储层和流体为实验对象,开展了原油黏度、药剂浓度和驱替方式对驱油效果影响实验研究。结果表明,随原油黏度增加,水驱或调驱增油降水效果变差;与水驱相比较,"调剖+水驱"可以较大幅度扩大波及体积和提高采收率。与单独调剖相比较,采取"调剖剂+强化分散体系"注入段塞组合,不仅可以扩大波及体积,而且能够提高洗油效率,采收率增幅进一步提高。

According to the development present situation, reservoir geology and fluid characteristics in Bohai oilfield, taking BZ25-1 oilfield reservoir and fluid as experimental object, influence of the crude oil viscosity, concentration of reagents and displacement mode on was studied. The results show that, with the increase of crude oil viscosity, oil displacement effect of water flooding or profile control and oil displacement decreases; Compared with water flooding, the method of ＂profile control ＋ water flooding＂ can greatly expand swept volume and improve recovery rate. Compared with single profile control, the method of ＂profile control ＋ reagents＂ injected slug combination, not only can expand the swept volume, but also can improve the efficiency of washing oil, and improve oil recovery further.