Abstract
Abstract Although permeability modifications of oil reservoirs by means of in-situ gelation processes are of great interest in additional oil recovery, little information on the phenomena taking place inside the porous media during gelation is available. A new approach based on Nuclear Magnetic Resonance Imaging (MRI), a novel non-destructive technique, has been tested. The NMR method is compared with classic laboratory tests based on rheology and pressure drop measurements. The results of several laboratory experiments carried out at different conditions, in vitro and inside porous media, are presented. NMR imaging constitutes a powerful tool to characterize the gelling process inside the porous media complementary to the classical displacement tests (i.e. pressure drop).
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