Analysis of Water-oil Displacement Characteristics in Offshore Reef Limestone Reservoir
The internal microstructure of reef limestone reservoirs is intricate,classifiable into four categories based on complexity:relatively tight,tight-fractured,porous-fractured,and pore-porosity reservoirs.However,the water-oil displacement characteristics in reef limestone reservoir remain unclear.Therefore,employing experimental analysis methods such as short cores,long cores,and full-diameter test,we elucidated water-oil displacement characteristics under different core scales and reservoir types.The study reveals that,influenced by microscopic non-equilibrium displacement phenomena,large pores and channels are susceptible to water saturation.In core water-oil displacement experiments,the water saturation rapidly rises,reaching a high level and maintaining consistently.As the permeability spatial scale increases,enhanced heterogeneity leads to a diminishing trend in oil displacement efficiency.These research findings provide a scientific basis for analyzing percolation mechanisms and dynamic development characteristics at the reservoir scale.
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NSTL
万方数据
维普
