Abstract
In order to reveal the seepage characteristics of low permeability fluid in reservoir pores, the seepage mathematical equation of low permeability reservoir is derived based on the mechanical equilibrium equation. The characteristics and rules of oil and water seepage flow in low permeability reservoir are studied. The seepage process and starting mechanism are deeply analyzed. The starting pressure gradient is derived from its yield stress and surface force, and the boundary layer intensifies the nonlinear degree of seepage. In the actual reservoir development, the nonlinear characteristics of seepage should be fully grasped. The results show that the starting pressure is related to permeability and other physical properties such as viscosity and porosity.
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