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为了更好地认识缝洞型碳酸盐岩油藏的特殊渗流机理,根据某油田缝洞型碳酸盐岩的实际情况设计制作了全直径缝洞型岩芯模型,实验岩样来源于油田的实际岩芯,采用油田实际油样和相似地层水进行了模型水平、倾斜30°、倾斜60°三种不同角度的水驱油机理物理模拟实验,分析实验结果,认为缝洞型碳酸盐岩采收率、含水率、无水采收期等与缝洞倾斜情况和缝洞结构有密切关系。并将实验数据应用于Cruz-HernandezJ等人基于对流-扩散渗流理论建立的缝洞型油水两相流动系统数学模型的拟合中,讨论了数学模型中的空间系数、扩散系数和流动速度对模型拟合的影响情况,并提出了模型的改进应考虑重力作用、流体流速、孔洞配位数等影响因素。
In order to better understand the special percolation mechanism of fractured-cavity carbonate reservoirs, a full-diameter fractured-tunnel core model was designed and produced according to the actual situation of fractured-cavity carbonate rocks in a certain oilfield. Experimental rock samples were derived from oilfields , The physical simulation experiments of water flooding mechanism at different angles of 30 ° tilt and 60 ° tilt are carried out by using the actual oil samples and similar formation water in the oilfield. The experimental results show that the fractured-cavity carbonates Rock recovery rate, water cut, dry recovery period and so on are closely related to the inclination of seam cave and the structure of seam cracks. The experimental data were applied to the mathematical model fitting of Cruz-HernandezJ et al. To the fractured-hole oil-water two-phase flow system based on the convection-diffusion seepage theory. The effects of spatial coefficients, diffusion coefficients and flow velocities on the model The influence of the fitting and the improvement of the model should be taken into consideration such as the gravity effect, the flow velocity of the fluid and the coordination number of the holes.