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This type of flow 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 transiting from one to another.
Although the actual 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 modela radial flow pressure model
Formation pressure
, skin-factor , transmissibility and pressure diffusivity are called basic diffusion model parameters as they are essential components of all diffusion models.Inputs & Outputs
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and and | LaTeX Math Block Reference |
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play show how the basic diffusion model parameters impact the pressure response while other diffusion parameters are encoded in function and play important methodological role as they are used in many algorithms and express-methods
of of Pressure Testing.
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| title | Line Source Solution |
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In simplest case of infinite homogeneous reservoir, produced by a vertical well the function has an exact analytical formula, given by exponential integral | LaTeX Math Inline |
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| body | F(z) = {\rm Ei}_1 (z) |
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(see Line Source Solution (LSS) @model).
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