基于CT扫描测定低渗岩心相对渗透率曲线的方法

摘要

中国低渗透油藏多采用水驱开采,而作为水驱开采核心参数的相对渗透率数据却难以通过传统的实验手段准确获得.为此,运用CT扫描方法,提出了基于CT扫描测定低渗透岩心相对渗透率曲线的稳态实验法和非稳态实验法.在稳态法中,针对低渗岩心难以达到绝对稳定的问题,给出了基于CT扫描数据的稳定评判依据.采用1种校正方法,克服了射线硬化的影响,提高了CT测量流体饱和度的精度.对2块低渗岩心的测试表明,该方法切实可行.%The recovery scheme for most Chinas low permeability reservoirs is water flooding, however, it's difficult to get the key rrndata of relative permeability in water flooding by conventional experiment. The steady state experiment and non - steady rrnstate experiment of getting relative permeability curves with low permeability cores is raised based on scanning. In steady rrnstate methods, in view of the fact that its difficult to get steady state, steady judgement bases are given based on CT rrnscanning data. The adoption of 1 calibration method can overcome the influence of ray hardness, and therefore increases the rrnaccuracy of measuring fluid saturation by u-sing CT scanning. The test with 2 cores show that the method is practical and rrnfeasible.