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In majority of practical well tests

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the pressure

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diffusion in multi-phase segregation of reservoir flow the pressure response can be approximated by

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 single-phase pressure diffusion

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model with a specific from of fluid/reservoir properties.

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В ряде практических случаев, а именно когда поле насыщенности за время теста слабо меняется, поле давления не имеет резких пространственных градиентов и влиянием капиллярных сил на параметры пластового флюида можно пренебречь, то динамика давления в пласте может быть представлена как нелинейная фильтрация некого эффективного однофазного флюида с неким средним по трем фазам давлением.

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This approximation can be done in one of three ways:


Linear Perrine multi-phase diffusion


the simplest multi-phase fluid 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 fluid 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

  • requires analyst to select a reference pressure point where the pressure simulation will be more accurate



Non-linear multi-phase diffusion

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fluid 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


See also

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Pressure diffusion / Pressure Diffusion @model

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