Optimized Laboratory Experiment on Interlayer Interference in Heterogeneous Reservoirs
During the development of multi-layer heterogeneous reservoirs through commingled injection and production,interference be-tween layers occurs due to various factors such as reservoir lithology,petrophysical properties,formation pressure,and fluid properties.The previous laboratory experiments on parallel displacement failed to effectively simulate fluid exchange between layers during the commin-gled production of multiple layers,and the physical meaning of the defined interference coefficient does not align with the flow process in water injection development.In this paper,an experimental model of series-parallel combined displacement was established to simulate the variation of lithology within the reservoir layers.The oil production,water cut,and recovery rate of cores with different permeabilities in the experiments were investigated to verify and re-understand the interference coefficient.The results show that interlayer interference is es-sentially a phenomenon that the variation of flow resistance of reservoir layers with time leads to alteration in flow distribution within the layers.Reservoir heterogeneity is identified as a key factor in forming dominant flow channels during commingled production.The research results provide a reference for designing interlayer interference experiments and developing heterogeneous reservoirs rationally and effi-ciently.
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