Unsteady fluid dynamics in Newtonian and non-Newtonian fluid is the main concern of aeronautical, mechanical, chemical, resource, and civil engineering fields, etc. Seismic stimulation is known as one of the Enhanced Oil Recovery (EOR) methods and is regarded as one of unsteady flow problems. Numerous observations show that seismic stimulation to oil reservoir may improve oil production. However, for the application of seismic EOR efficiently, we need to understand the characteristics of changing apparent viscosity of fluid in geological formation. In this study, we attempt to demonstrate the apparent viscousity of fluid in laminar flow under oscillating boundary condition with the models of a single pore throat and porous media. In this study, we set up two hypotheses: one is pressure disturbance causes apparent viscosity change and the other is the apparent viscosity of porous media can be estimated in the use of apparent viscosity of single pore throats. Then, We find pressure disturbance causes apparent viscosity change as a function of the incident angle of shear waves in either vertical or horizontal and the tortuosity of pore throats. And we finally find that the change in the apparent viscosity for a network system of pores and pore throats could be different from that for a single pore throat model due to local pressure disturbance.


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