Study on Oil-water Two-phase Migration Mechanism of Low Permeability Fractured Core based on the Online NMR Testing

Abstract Understanding the dynamic migration mechanism of oil-water two-phase is key to improve effect water injection development in low permeability fractured reservoir. Based on artificial fracturing core and basic physical parameter testing, online NMR displacement experiments cores with different fracture widths are conducted analyze distribution characteristics mechanisms. The experimental results show that when breaks through at outlet, oil volume small pores basically unchanged. In large it decreases a certain extent, while greatly. When over, still changes little, greatly pores, almost zero fracture. With decrease width, recovery ratio waterflooding front final after increase gradually. contribution proportion as whole, increases gradually, slightly. research lay foundation for optimal design parameters adjustment technology policy