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In many practical cases the reservoir fluid flow created created by well is is getting aligned with a radial direction towards or away from well.
This type of reservoir fluid flow is is called radial fluid flow and corresponding pressure diffusion models provide a diagnostic basis for pressure-rate base reservoir flow analysis.
The radial flow can be infinite acting or boundary dominated or or transiting from one to another.
Although the actual reservoir fluid flow may not have an axial symmetry around the well-reservoir contact or reservoir inhomogeneities (like boundary and faults and composite areas) but still:
- the dominant part of wellbore and reservoir pressure variation is usually radial-flow or linear-flow and the two represent the basis for Pressure diffusion analysis
- in most practical cases the long-term correlation between the flowrate and bottom-hole pressure response can be approximated by a radial flow pressure model
Formation pressure pressure
,
skin-factor factor ,
transmissibility transmissibility and
pressure diffusivity diffusivity are called
basic diffusion model parameters as they are essential components of all diffusion models.
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