冷冻工艺对岩心物性参数的影响及其校正

Effect of Refreezing Technology on Core Physical Parameters and Their Correction

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.

Using core refreezing technology to refreeze unconsolidated core from watered out area and heavy oil area can make core shape, prevent volatilization loss of fluid in core, and be favourable to determine the parameters as fluid saturation and the like. But fluid expansion of core resulted from refreezing can destroy pore structure of core, make physical parameters before and after refreezing change. Based on correlation analyses, this paper discussed changing regularity of porosity, permeability and saturation etc, presented a correction equation of porosity and correction factor of permeability, put forward step correction method of saturation, providing convient conditions for oilfield to properly use physical analysis data of refrozen core.