Influence of Pore Throat Structure and the Multiphases Fluid Seepage on Mobility of Tight Oil Reservoir

Abstract Mobility is the main factor restricting production of tight oil. In order to explore influence pore throat structure and fluid seepage on mobility, six sandstone samples are selected by high-pressure mercury intrusion, nuclear magnetic resonance, water driving oil experiments, oil-water relative permeability experiments discuss multiphases mobility The results indicate that with increase in effective porosity, more exchanged, phase enhanced. large positively correlated while relationship between small porosity remains unclear. Particularly, determined matching radius sorting reservoir. Specifically, smaller two-phase copermeation zone, greater bound saturation; slope curve, less space for two phases flow together; blocked reservoir, worse mobility. can be divided into four categories radius, coefficient, saturation.