experimental study of effect of salinity variation on dynamic interfacial properties in pure calcite/crude oil/brine system

Low salinity water flooding (lswf) is not well understood in carbonate reservoir# the dynamic state of fluid-fluid and rock-fluid interactions is shown to play an important role on the performance of lswf# to capture these interactions, dynamic interfacial tension (dift) and dynamic contact angle (dca) are conducted in a wide range of salinity# the results show that as the brine salinity increases the dift reduces# dca measurement is performed in a pure calcite crystal/ brine/crude oil system# it is shown, increasing brine salinity leads to increasing contact angle toward intermediate wetness#in addition, to investigate the effect of dynamic ift and contact angle change on the displacement efficiency in porous media, coreflood tests are also performed using synthetic calcite cores# the results of secondary water flooding tests showed that increasing the salinity of injected water from 10-time-diluted sea water to sea water leads to additional oil recovery of 3 % of original oil in place, which were in line with ift and contact angle results for the brines#