低渗砂岩非稳态相对渗透率曲线计算的修正方法

大量的岩心相对渗透率实验表明,低渗储层岩心的相对渗透率测定实验是比较困难的,由于低渗储层岩心孔喉尺寸小,油水在其中的流动相当复杂,岩心出口端流动呈非连续流动,使得产量数据的记录误差较大。根据这样的数据计算出的相对渗透率曲线就会出现很多异常情况,所以有必要对产量数据进行校正。本文根据束缚水饱和度、残余油饱和度、总产液量保持不变对产油量曲线进行光滑处理。本文对非稳态法测得的油水相渗进行了修正,使得修正后的相渗曲线可以用于数值模拟等计算。

The correction method of permeability and water saturation curve on low permeability sandstone core

A lot of testing shows that unsteady testing of two-phase permeability saturation curve on low permeability rock core is very difficult in the laboratory. The pore and throat size of the low permeability rock is very small, so the oil and water flowing in the rock is very complex, which results in the discrete flow rate in the exit end of the rock core and big error in production data log. The permeability saturation curve derived from the above data will be abnormal and the production data is necessary to be corrected. Based on constant irreducible water saturation, constant residual oil saturation, and constant total fluid production, the oil production curve is smoothed by curve fitting. The permeability saturation curve calculated from the corrected data is smooth and can be used for numerical simulation computing.