Dynamic effects in capillary pressure relationships for two-phase flow in porous media: Experiments and numerical analyses

作者：Das Diganta Bhusan^*; Mirzaei Mahsanam

来源：AIChE Journal, 2012, 58(12): 3891-3903.

DOI：10.1002/aic.13777

• two-phase flow
• porous media
• transient flow
• quasi-static flow
• capillary pressure
• saturation
• dynamic effect

Well defined experiments and numerical analyses are conducted to determine the importance of dynamic effect in capillary pressure relationships for two-phase flow in porous media. Dynamic and quasi-static capillary pressure-saturation (Pc-Sw) and, ?Sw/?t-t curves are determined. These are then used to determine the dynamic effects, indicated by a dynamic coefficient (t) in the porous domains which establishes the speed at which flow equilibrium (?Sw/?t = 0) is reached. t is found to be a nonlinear function of saturation which also depends on the medium permeability. Locally determined t seems to increase as the distance of the measurement point from the fluid inlet into the domain increases. However, the functional dependence t-Sw follows similar trends at different locations within the domain. We argue that saturation weighted average of local t-Sw curves can be defined as an effective t-Sw curve for the whole domain which follows an exponential trend too.

• 出版日期2012-12