Simulation of End Effects in Relative Permeability Experiments

摘要

The end effects in steady-state oil-water relative permeability measurements for a sand pack have been investigated by simulation. The exit length, which is due to capillary retention of the water, is shown to increase with decreasing flow rate and water-oil ratio (WOR). On the contrary, the entrance length increases for increasing flow rate and WOR. Thus it is important to ensure as uniform an inlet flow distribution as possible. If the two fluids are introduced via a common inlet chamber, it is necessary to assume either fingering flow, which may occur at high flow rate and WOR, or pulsating flow, which occurs at low rate and WOR. Stirring is an efficient means to reduce the entrance length. The use of a high-permeability dispersing inlet section is another method, which is also investigated. (ERA citation 13:035660)