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SUMMARY:Improving Oil Recovery Using Controlled Salinity Waterflooding - D
 r Matthew Jackson\, Imperial College
DTSTART:20170209T113000Z
DTEND:20170209T123000Z
UID:TALK69559@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:It is widely accepted that oil recovery during waterflooding c
 an be improved by modifying the composition of the injected brine in a pro
 cess called controlled salinity waterflooding (CSW).  However\, despite a 
 plethora of studies and data\, the underlying mechanisms causing improved 
 recovery remain poorly understood. Moreover\, there is no method to determ
 ine the optimum injection brine composition for a given crude-oil-brine-ro
 ck system.  Many studies have reported the successful application of CSW. 
  However\, many others (and more unpublished) observed no benefit\, and th
 e available data are often inconsistent and contradictory.  This presentat
 ion will give a brief overview of the available data\, and the pore- to mi
 neral-surface-scale mechanisms that have been proposed to explain improved
  recovery.  New data will be presented that suggests improved oil recovery
  during CSW is strongly correlated to changes in zeta potential at both th
 e mineral-water and oil-water interfaces. Improved recovery in the experim
 ents reported here occurred only when the change in brine composition indu
 ced a repulsive electrostatic force between the oil-brine and mineral-brin
 e interfaces.  The results suggest that the polarity of the zeta potential
  at both interfaces must be determined when designing the optimum CSW comp
 osition.  A key challenge for any model of CSW is to explain why improved 
 recovery is not always observed.  Here we suggest that failures using the 
 conventional (dilution) approach to CSW  may have been caused by a positiv
 ely charged oil-water interface that had not been identified.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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