Study of low Salinity Water injection effect on the Relative permeability and Capillary pressure curves

In many surfaces of carbonate rocks‚ the stability of the water film between the rock and the oil phase, which ishighly dependent on the surface load of the rock-water and water-oil interface‚ It suffers from rupture and instability‚so that the wettability conditions of carbonate reservoirs from the water wet condition in the range of oil wetting orwettability intermediate .The main reason for this phenomenon is the surface adsorption of oil components‚ In suchcases, due to the negative capillary pressure, water does not spontaneously enter into the carbonate matrix rock and asa result, the amount of oil recovery is significantly reduced. In this study‚ we discussed a bout low salinity water‚ thatcaused wettability alteration and affected on relative permeability and capillary pressure curves. These materials havethe ability to be placed in the water-oil or oil-rock surface to increased EOR helps trap the various mechanisms toreduce interfacial tension and change wettability to oil movement. Various mechanisms reduce the interfacial tensionand change the wettability to oil movement. Low salinity water injection has been considered by researchers as anefficient and low cost method for increasing EOR ‚ Thermodynamic equilibrium in the rock ˓oil ˓ water system of theformation in the reservoir must be changed for EOR process. After that by using SCAL in ECLIPSE software, we studythe effect of salt concentration on relative permeability and capillary pressure behavior. Results show that relativepermeability curves shift to right and water wetness and capillary pressure curves shift upward.

Keywords:

low salinity water injection , wettability alteration , relative permeability curve , capillary pressure curve