Relative permeability curves are fundamental inputs for reservoir simulation and enhanced oil recovery design. Steady-state and unsteady state multi-phase corefloodings are two methods to obtain these curves (Andersen et al., 2019). Although the capillary end effect (CEE) is a prominent issue in coreflooding experiments, discontinuity in narrow pore size distribution to open space exists during coreflooding that forces capillary pressure towards zero, causing errors in the calculation of saturat