A new pore network based algorithm for water-oil displacements in core

Abstract

The concept of quasi-dynamic displacement is presented to describe displacement with velocity between quasi-static and dynamic process. Viscousity is treated in different way in different scale: displacement in representative elementary volume(REV) scale is treated as dynamic, while displacement in pore scale is treated as quasi-static. In REV scale, double network is proposed for simplified calculation of viscous force and capillary force. In pore scale, probability technique is used to reduce computational demanding. The new model is validated by previous numerical and experimental results. With the network established based on specific micro CT scan images, the influences of displacement velocity, pore radius distribution and pore corner shape on water flooding process are analysed. The numerical model in this work is conducive to the understanding of the whole process of water-oil displacement.