What is the reduction in an ability of a fluid to flow in the presence of two or more immiscible fluids called?

What is the reduction in an ability of a fluid to flow in the presence of two or more immiscible fluids called?

• A. Relative Permeability Effect
• B. Capillary Pressure
• C. Wettability Effect
• D. Multiphase Flow Resistance

Answer: (A)

In multiphase flow through a porous medium, the presence of two or more immiscible fluids reduces the ability of each fluid to flow compared with single-phase flow. This reduction is described by relative permeability: each phase has a relative permeability value between 0 and 1 that scales the absolute permeability for that phase. As saturations change, the connected pathways for a given fluid become more restricted, lowering its effective permeability and thus its flow rate under a given pressure gradient. Capillary pressure relates to the pressure difference across fluid interfaces due to interfacial tension, and wettability affects how fluids distribute on the rock surface; neither term captures the quantitative reduction in flow for each fluid caused by the presence of the other fluids. Therefore, the reduction in a fluid’s flow ability in the presence of another immiscible fluid is best described by the relative permeability effect.

In multiphase flow through a porous medium, the presence of two or more immiscible fluids reduces the ability of each fluid to flow compared with single-phase flow. This reduction is described by relative permeability: each phase has a relative permeability value between 0 and 1 that scales the absolute permeability for that phase. As saturations change, the connected pathways for a given fluid become more restricted, lowering its effective permeability and thus its flow rate under a given pressure gradient. Capillary pressure relates to the pressure difference across fluid interfaces due to interfacial tension, and wettability affects how fluids distribute on the rock surface; neither term captures the quantitative reduction in flow for each fluid caused by the presence of the other fluids. Therefore, the reduction in a fluid’s flow ability in the presence of another immiscible fluid is best described by the relative permeability effect.