基于离心法的油驱水和水驱油核磁共振分析

NMR centrifugation analysis technology for oil driving water and water driving oil processes

为了研究流体可动用性和评价水驱开发效果,通过高速离心的方法,对3类不同渗透率级别的岩样进行油驱水和水驱油实验,并借助核磁共振技术对2种驱替过程进行分析.分析得出,15块岩样可动流体T2截止值分布在8.03～41.06 ms,平均31.55 ms,可动流体饱和度分布在51.21%～75.92%,平均为68.19%.结合油驱水离心实验和核磁共振技术可以较好地评价流体可动用性.15块岩样水驱采出程度分布为39.23%～72.09%,平均为57.08%,证明了利用离心法进行水驱油是可行的,结合水驱油离心实验和核磁共振技术可以较好地分析水驱油孔隙动用规律和评价水驱开发效果.

In order to investigate the mobility of the fluid in pores and evaluate the effect of water flooding development,oil driving water and water driving oil experiments of three types of cores with different permeability levels are carried out by high-speed centrifugal method,and two types of driving processes are analyzed by NMR technology.The results show that,the T_2 cutoff values of 15 cores distribute in 8.03～41.06 ms,and their average value is 31.55 ms;the saturation of movable fluid distributes in 51.21% ～ 75.92%,the average is 68.19%;the mobility of fluid can be evaluated by combining oil driving water centrifugal experiments with NMR technology.The recovery rate of 15 cores distributes in 39.23% ～72.09%,and the average is 57.08%;the water driving oil process can be realized by centrifugal method,and the mobile law of fluid in reservoir pore and the development result of water driving oil can be analyzed and evaluated by combining water driving oil centrifugal experiments with NMR technology.