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The word "Inflow" is misnomer as IPR analysis is applicable for both producers and injectors.
The most general proxy-model is given by LIT (Laminar Inertial Turbulent) IPR model:
| LaTeX Math Block |
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a \, q + b \, q^2 = \Psi(p_r) - \Psi(p_{wf}) |
where
| static pressure |
| laminar flow coefficient |
| turbulent flow coefficient |
| pseudo-pressure function specific to a certain gas PVT model |
It needs well tests at least three different rates to assess
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| body | --uriencoded--\%7B a \, , \, b, \, p_r \%7D |
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but obviously more tests will make assessment more accurate.
The IPR analysis is closely related to well Productivity Index (PI)
which is defined as below:
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where
is the turbulent flow exponent, equal to 0.5 for fully turbulent flow and equal to 1 for laminar flow
.The more accurate approximation is given by LIT (Laminar Inertial Turbulent) IPR model:
| LaTeX Math Block |
|---|
|
a \, q + b \, q^2 = \Psi(p_r) - \Psi(p_{wf}) |
where
– is pseudo-pressure function specific to a certain gas PVT model, is laminar flow coefficient and is turbulent flow coefficient.It needs two well tests at two different rates to assess
| LaTeX Math Inline |
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| body | \{ q_{max} \, , \, n \} |
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|
or . But obviously more tests will make assessment more accruate.
Saturated Oil IPR
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For saturated oil reservoir the free gas flow inflict the downward trend of IPR plot similar to dry gas (Fig. 4).
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