非稳态法油水相对渗透率实验数据处理方法

非稳态法油水相对渗透率实验数据的处理方法主要是JBN法。许多学者基于JBN方法,在不同的适用条件下又衍生出函数拟合法与微分近似法。对比这两种处理方法不难发现,微分近似法计算所得的曲线形态比函数拟合法好,但是异常点较多。因此在总结、对比这两种处理方式优缺点的基础上,最终利用函数拟合法计算含油率,利用微分近似法计算油水相对渗透率,计算结果更加符合岩心实验的实际情况。同时还提出了利用多项式拟合来修正相渗曲线的方法,该方法不仅使相渗曲线更加光滑,而且能够真实地反映油水渗流规律。

EXPERIMENTAL DATA PROCESSING METHOD OF THE OIL-WATER RELATIVE PERMEABILITIES BY UNSTEADY STATE METHOD

At present,JBN method is the main method to deal with the experimental data about the water-oil relative permeabilities of the unsteady state.For many researchers,based on JBN method,under the different appropriate conditions,the function fitting method and the differential approximation method were derived.Compared between the two methods,it is not difficult to find that the calculated curve shapes by the latter is better than those of the former,but there are many outliers.Therefore,based on the summary and comparison of their advantages and disadvantages,the rate of oil was c calculated by the former,while the oil and water relative permeabilities were computed by the latter,the calculated results were more consistent with the actual presentation of the cores.At the same time,with the help of the polynomial fitting,the correcting method was proposed to the relative permeability curves,this method not only makes the curves more smooth,but also can really reflect the oil-water seepage laws.