In majority of practical well tests the pressure diffusion in multi-phase segregation of reservoir flow the pressure response can be approximated by single-phase pressure diffusion model with a specific from of fluid/reservoir properties.
This approximation can be done in one of three ways:
Non-linear most generic way| simplest multi-phase model, although it has a 3-phase form it normally works for oil-water system only |
| Pseudo-linear |
Linear Perrine the simplest | this model is capable to account for high compressibility of multi-phase |
model| components (light oil, condensate and gas) but does account |
| Non |
Pseudo
