In many practical cases the Radial Flow Pressure Diffusion is getting
reservoir fluid flow created by well is getting aligned with a radial direction towards or away from well.
This type of reservoir fluid 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 reservoir fluid flow may not have an axial symmetry around the well-reservoir contact or around reservoir inhomogeneities (like boundary and faults and composite areas) but still in many practical cases the long-term correlation between the flowrate and bottom-hole pressure response can be approximated by a radial flow pressure model
Inputs | Outputs | ||
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total sandface rate | reservoir pressure | ||
initial formation pressure | well bottomhole pressure | ||
skin-factor | |||
wellbore radius | |||
drainage radius |
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Radial fluid flow | Homogenous reservoir | Finite reservoir flow boundary | Slightly compressible fluid flow | Constant rate | Constant skin |
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Equation shows how the basic diffusion model parameters impact the relation between drawdown and total sandface flowrate and plays important methodological role as they are used in many algorithms and express-methods of Pressure Testing. It also called Dupuis
The Total Sandface Productivity Index for low-compressibility fluid and low-compressibility rocks does not depend on formation pressure, bottomhole pressure and the flowrate and can be expressed as:
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Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Dynamics / Radial fluid flow / Pressure diffusion / Pressure Diffusion @model / Radial Flow Pressure Diffusion @model
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing
[ Well & Reservoir Surveillance ]
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