Fluid-structure Interaction Seepage Law

The tbrmation pressure declines with the production in deformablc reservoir, which changes the effective stress, and the total stress is also changed. The variation of stress causes the displacement of the solid grains and the deformation of rocks. The parameter of rocks (permeability, porosity, compressibility, ci. al) are changed also because of the variation of rock defonnation. This alternative affection phenomenon is called Solid-Fluid-Coupling and is considered importani~ in oil field development and the land subsidence during the recovery 01 groundwater. In this paper two questions are considered. The first is affection of?the effective stress variation on the rock parameter; the second is the relationship between the deformation and porous pressure and the coupled math model is established. The experiment indicates the permeability decrease with effective stress, and can not recover whet effective stress decrease; The pore volume also decrease with effective stress, it can recover when effective stress return; The compressibility of rock is the function of?net stress. Two phases fluid (water and oil) flov~ model considering solid-fluid coupling phenomenon is established which is based on Darcy抯 Law and linear poroelastic theory. In this model permeability, porosity, compressibility is the function of?pressure.