二元复合驱孔隙动用规律核磁共振实验研究

Experimental Study of Active Pore Distribution Law in Binary Compound Flooding by Using NMR

利用取自大庆油田高台子区块的中-高孔、中渗储层岩心,通过核磁共振定量分析岩心聚合物、表面活性剂(SP)二元复合驱后大、中、小孔隙的采出程度、剩余油饱和度等。结果表明,水驱后二元复合驱主要动用中、小孔隙剩余油,其中中等孔隙驱油效率提高最大;二元驱后剩余油主要分布在中等孔隙中,中等孔隙是剩余油挖潜的重点方向;对于高台子储层,适当提高二元体系聚合物浓度可以提高孔隙驱油效率,提高采收率。

Using the cores with medium-high porosity and medium permeability from Gaotaizi block of Daqing Oilfield,the recovery degree and residual oil saturation of large,medium and small pores in the cores after binary compound flooding are quantitatively studied by means of nuclear magnetic resonance analysis technology,and the results show that： In binary compound flooding,the residual oil in medium and small pores is mainly driven out,and the oil displacement efficiency of the medium pores is the greatest. Residual oil mainly distribute in the medium pores after binary compound flooding,so the medium pores are the key to tapping remaining oil. For Gaotaizi reservoir,properly increasing the polymer concentration of binary compound flooding system can improve the pore oil displacement efficiency and the recovery ratio of the reservoir.