关键词: 薄层底水油藏, 隔板, 工作液, 注入水存水率, 可视化物理模拟

Abstract: The injected water is easy to enter into oil wells along the water channel in the horizontal high-permeability layer and flow into the bottom water layer along the vertical high-permeability zone.The mechanism and methods for improving the net injection percentage of injected water in thin-layer oil reservoir with bottom water were proposed.The inner-layer barrier along the high-permeability layer was built up,and bottom water barrier was built up in the vicinity of oil and bottom water interface.Four working fluids including washing fluid,density adjustment fluid,barrier fluid and over-displacing fluid for building up the inner-layer barrier and bottom water barrier were prepared.The operation technologies such as washing channel of barrier fluid,partially improving bottom water density,injecting barrier fluid and over-displacing fluid,shut-in waiting for setting were also designed.The rational selection of working fluid and building up of operation technology are favorable to simultaneously build the inner-layer barrier and bottom water barrier in a single operation process.The build-up of the barriers can be testified by visual physical simulation.

Key words: thin layer oil reservoir with bottom water, barrier, working fluid, net injection percentage of injected water, visual physical simulation