用CT扫描技术观测岩心中液流特性

CT扫描技术实验表明可以清楚地看到岩心内部所发生的流体流动状况、两相区前缘形态及其变化,以及岩心横断面上液流流经的区域;可以测量出液流的真实速度,进而计算出有效的流动孔隙度(此孔隙度的概念与油层物理中的概念不同);可以观测到水驱油时水区含水饱和度的变化。此外,还介绍了用CT扫描技术研究岩心孔隙结构的情况.

AN OBSERVATION ON The FEATURE OF FLUID FLOW THROUGH ROCK CORE BY MEANS OF CT SCANNING

Experiments show that, by means of CT scanning, following phenomena can be clearly seen: 1) Fluids flow inside the core; 2) The driving front and its changes; 3) Areas through which fluid flows in a core section;In addition,experiments with CT scanner demonstrate the real velocity of fluid flow in the core and therefore the porosity effective for fluid flow can be calculated(the concept of this porosity is different from that conventionally used in reservoir engineering).With a CT scanner, the water saturation changes in water flooded zone when water displace oil can be observed. In this paper,a brief introduction on the pore structure of rock core with a CT scanner is presented also.