THE IMPACT OF WETTABILITY ON WATERFLOODING - PORE-SCALE SIMULATION

This paper describes the development and implementation of a pore-scal e simulator into which pore-wettability effects have been incorporated . Relative permeability and capillary pressure curves from this steady -state model have been analyzed to allow better interpretation of expe rimental observations from a microscopic standpoint. The simulated cap illary pressure data demonstrate that some standard wettability tests (such as Amott-Harvey and free imbibition) may give misleading results when the sample is fractionally wet in nature. Waterflood displacemen t efficiencies for a range of wettability conditions have been calcula ted, and recovery is shown to be maximum when the oil-wet pore fractio n approaches 0.5. Furthermore, a novel experimental test is proposed t hat can be used to distinguish between fractionally wet and mixed-wet porous media. To date, no such satisfactory test exists.