REPERMEABILITY OF DAMAGED CORES BY FORMATION OF MICROEMULSIONS DURINGACID TREATMENT

The improved mobility of residual oil, attained by the formation of mi croemulsions in low-tension flooding could be made to apply to acid st imulation. By formation of microemulsions, the oil restraining viscosi ty- and capillary forces could be drastically reduced. The formation o f water- as well as emulsionblock can therefore be prevented The oil s aturation in the near-well bore area can be reduced and the water wett ability of the zone increased resulting in a better access for treatme nt with water based acids The acid reaction rate is also retarded prev enting faster acid breakthrough and fingering.