Displacement of oil and water in porous media of reservoir rocks is described by relative                      permeability curves, which are important input data for reservoir performance simulation and drive mechanism studies. Many core studies, such as multiphase relative permeability, capillary pressure and saturation exponent determination, depend on the volume fractions of multiphase flui...

We measure the pressure difference during two-phase flow across a sandstone sample for range of injection rates and fractional flows water, wetting phase, an imbibition experiment. quantify onset transition from linear relationship between rate gradient to nonlinear power-law dependence. show that (Darcy) exponent in is function flow. use energy balance accurately predict intermittency flows, f...