The oil outflow from porous-rock blocks due to water imbibition interchange and to gravitational drainage, are described by schematic mathematical models that include actual petrophysical properties of the fluids as well as dimensions of the blocks. The models were validated through comparison of their results with those of numerical simulations of these problems. The simulations cover wide realistic ranges of values of the properties involved.

The models can be used to compute the expected behavior of blocks in fractured reservoirs and to calibrate block behavior in numerical simulators that use parameters instead of actual properties of the fractured porous media.

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