On Change Rule of Reservoir Parameter before and after Water Flooding in Pingbei Ultra-low Permeability Reservoir

Water displacing oil experiments through cores of different permeability prove that the permeability after a long-term water flooding has dropped at different levels.By test analysis with the help of scanning electron microscope,casting thin sections and clay mineral,it is found that Reservoir micro pore structure influences the change of reservoir parameter before and after water flooding.Ultra-low permeability reservoir has characteristics of small channel,high clay mineral content and easy dropping and migrant rock particles likely to plug the channel.These factors reduce the reservoir permeability in the process of water-flooding development.