Magnetic Resonance Imaging of Phase Trapping and In Situ Permeability Modification in Unconsolidated Porous Media

摘要

In oil recovery operations, microscopic displacement efficiency is dominated by capillary and viscous forces, which in turn determined trapping of oil or other fluids in a porous medium, whereas macroscopic sweep efficiency is controlled by mobility ratio and rock formation heterogeneity. This article addresses the use of the centric scan SPRITE magnetic resonance imaging (MR1) technique to visualize plw.se trapping and mobilization through a channel in a model unconsolidated porous medium. It also deals with the MR imaging of the effect of the application of a weak polyacrylamide gel through a high-permeability channel as in situ permeability-reduction treatment to control displacing fluid channeling.