Multi-phase pressure diffusion @model

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:

Linear Perrine multi-phase diffusion

the simplest multi-phase model

although it has a 3-phase form it normally works for oil-water system only

Pseudo-linear multi-phase diffusion

this model is capable to account for highly compressible multi-phase components (light oil, condensate and gas) and

in case of high drawdown it does not model pressure accurately both in near and far reservoir zone and requires analyst to select a reference pressure point where the pressure simulation will be more accurate

Non-linear multi-phase diffusion

this model covers a wide range of 2-phase and 3-phase models in a wide range of pressure variations and

it does not account for capillary pressure
it does bot cover the segregated gas-liquid reservoir flow

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Multi-phase pressure diffusion @model