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The usual classifications are summarised below:
| Number of phases | Number of wells | Solver type |
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| Single-phase pressure diffusion model |
| Single-well | Analytical |
| Multi-phase pressure diffusion model | Multi- |
| well | Numerical |
In many practical cases the pressure diffusion processes honor PDE with constant coefficients and opens the following engines:
| Time Convolution | Spatial Superposition |
| Pressure convolution model | Pressure superposition model |
| Pressure deconvolution model | Pressure decomposition model |
See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing
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