NUMERICAL SIMULATION AND ANALYSIS OF OIL-WATER DISPLACEMENT BEHAVIOR IN ROUGH CAPILLARY CHANNEL
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摘要: 油水运移和聚集研究,对认识油气藏的成藏规律和指导油气勘探具有重要意义.表面张力是油水运移的重要影响因素,在不同几何形状的运移通道中,表面张力可能是驱替的动力或阻力.采用表面规则的突起台阶模拟粗糙元,使用非定常的Navier-Stokes方程和流体体积函数(VOF)界面追踪方法,使用连续表面张力(CSF)模型考虑表面张力的影响,对毛细管通道中的油水驱替进行了数值模拟.计算结果表明:粗糙元的形状和尺寸是影响油水界面形态和流量的重要因素;由表面张力驱动的流体通过粗糙元形成的喉道时会发生水相被油相包裹的现象;在入口压力驱动下,油水发生分段流动现象.Abstract: The research on oil-water migration and accumulation plays an important role in understanding reservoir forming regularities,as well as guiding oil and gas exploration.As an important influence factor in oil-water migration,surface tension may act as driving force or resistance of oil-water displacement,depending on the geometric shape differences of the migration channels.A numerical simulation of oil-water displacement in the capillary channel has been made by using the surface regular protuberances for simulating the rough elements,using the unsteady Navier-Stokes equation with volume of fluid(VOF) interface tracking method and the continuum surface force(CSF) model for the surface tension.The results show that the shape and size of the rough element have important effect on the shape of oil-water interface and the mass flow rate;and when driven by surface tension,water phase can be wrapped by oil phase around the throat formed by rough elements,whereas oil may flow separately in water phase when driven by the entrance pressure.
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Key words:
- capillary tube /
- volume of fluid /
- continuum surface force /
- oil-water displacement
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