The purpose of this work is to apply computerized X-Ray tomography techniques to visualize the development of viscous fingering during the displacement of an oil phase through an homogeneous,natural and consolidated porous media.Viscous fingering during two-phase flow is obtained by appropriate selection of both injection rate and mobility ratio.The porosity and saturation profiles have been computed by means of image analysis through the use of a graphical interpretation software.The image analysis of the cross sections shows that,under conditions of hydrodynamic stability,the displacement of water by oil occurs as predicted by the pistonlike model,with small gravitational effects.On the other hand,when the oil phase is displaced by a water phase under unstable hydrodynamic conditions,the injected water flows through well defined regions of the porous media.Gravity segregation is also observed in this case.Provided the injection parameters and the connate water saturation are kept constant,the water saturation profiles as a hnction of self-similar dimensionless variable(xD 1 t~)merge to a single curve.For the same injection conditions,it was observed that the curves of oil permeability versus water saturation overlap themselves.Such overlapping also happens with the water relative permeability versus water saturation curves.It was evident that the oil relative permeabilities are strongly influenced by the injection rate of a higher mobility fluid.The shape of the water relative permeability curves indicates the existence of two Qfferent displacement mechanisms taking place along the core.Moreover,the water fractional flow curve is characteristic of unstable displacement.
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机译：The purpose of this work is to apply computerized X-Ray tomography techniques to visualize the development of viscous fingering during the displacement of an oil phase through an homogeneous,natural and consolidated porous media.Viscous fingering during two-phase flow is obtained by appropriate selection注射速率和迁移率。通过使用图形解释软件通过图像分析来计算孔隙率和饱和型材。横截面的图像分析表明，在流体动力稳定性的条件下，水的位移通过由活塞式模型预测的，具有小的引力效应。另一方面，当油相通过水相管在不稳定的流体动力学条件下移位时，喷射水流过多孔介质的良好定义的区域.Gravity偏析在这种情况下也观察到。提供注入参数和生成水饱和保持符合静坐，水饱和度曲线作为自相似的无量纲变量（XD 1 T〜）合并到单个曲线。对于同一注射条件，观察到油渗透率与水饱和度的曲线重叠。uch重叠也发生在水相对渗透率与水饱和曲线上。显而易见的是，油的相对渗透性受到更高迁移率液的喷射率的强烈影响。水相对渗透率曲线的形状表明存在两个QFFERENT置换机制的存在沿着核心的地方.OROOVER，水分流量曲线是不稳定位移的特征。
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