Determination of Non-Darcy Porous Flow Boundary Value in Formation Type III
With the oil industrialization area increasing and the fine Petrophysics block decreasing, the oil field is faced with the situation that isn’t enough potential, thus it’s necessary to begin effective developing in formation type III, which has high potential, strong heterogeneity and low permeability. It’s important for reservoir development to understand porous flow law in formation type III. There is a large reserve in formation type III of X block in Daqing Oil Field, whose main formation type is thin and poor formation with thin thickness and poor Petrophysics. To find the boundary value for Non-Darcy porous flow in formation type III, we study the pressure number to recognize Non-Darcy porous flow and Non-Darcy porous flow index in characteristic curve for porous flow. We also study the Non-Darcy porous flow boundary value with two methods, pressure number method whose result is 107 mD, Non-Darcy porous flow index method whose result is 120 mD. The two values are similar, thus the Non-Darcy porous flow degree increases sharply when permeability is less than 10 mD. The study provides theory guide for improving residual oil potential and enhancing development effect in formation type III.
Key Words: Thin and poor formation; Non-Darcy porous flow boundary value; Pressure number; Non-Darcy porous flow index
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