Nanotechnology has a wide application prospect in unconventional oil and gas development and is expected to become a new generation of disruptive development technology.The relative permeability needs to be studied as a vital flow characteristic of displacement and imbibition.The relative permeability experiments with shale core were conducted for different flooding media,including nano-agent,surfactant,etc.The results show that:1)The characteristic n value of nano-oil displacement agent decreased significantly,which is beneficial to improve oil-water fluidity and reduce injection pressure;2)The relative permeability of the endpoint of water phase with low concentration nano-agent is significantly higher than that of formation water,the flowability of aqueous solution with low concentration nano-agent is stronger;3)The two-phase area of the nano-oil displacement agent is 8.8％more than that of oil-water,and the range is small,so it is important to improve the development mode to improve the displacement efficiency further;4)The displacement efficiency can be significantly increased from 36.67％to 74.67％by the combination of displacement and imbibition;5)The development effect can be further improved by cycle displacement,and the displacement efficiency is 14.1％higher than continuous displacement(injection volume multiple 0.478 PV).The research result is important for development mode optimization to supplement energy,oil production stability,and enhanced oil recovery of shale oil reservoirs.
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