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用岩心冷冻工艺处理水淹区、稠油区的易散岩心,可使岩心成形,防止岩心内流体挥发,以利于确定流体饱和度等项参数.但冷冻所引起的流体膨胀,会破坏岩心的孔隙结构,使冷冻前后岩石物性参数发生变化.本文通过对比分析,探讨了岩心冷冻前后孔隙度、渗透率、饱和度等项物性参数的变化规律,并给出了孔隙度的校正方程和渗透率的校正系数,提出了饱和度的分步校正方法,为油田正确使用冷冻岩心物性分析资料提供了便利条件.
Core freezing process of flooded area, heavy oil area of the easy core, the core can be shaped to prevent the core fluid volatilization, in order to facilitate the determination of fluid saturation and other parameters.But the freezing caused by fluid expansion, will destroy the core Pore structure to change the petrophysical parameters of the rock before and after freezing.This paper discussed the variation law of physical parameters such as porosity, permeability and saturation before and after freezing by comparison analysis, and gave the correction equation and permeability of porosity , A stepwise correction method of saturation is proposed, which provides a convenient condition for the correct use of the data of frozen core analysis in oilfields.