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| LaTeX Math Block |
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J = \frac{q}{p_{\rm frm} - p_{wf}} = \frac{2 \pi \sigma}{ \ln \frac{r_e}{r_w} + \epsilon + S} |
where
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| Drain-area Productivity Index, | LaTeX Math Inline |
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| body | J_r = \frac{q}{p_r - p_{wf}} |
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| Drain-boundary Productivity Index | LaTeX Math Inline |
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| body | J_e = \frac{q}{p_e - p_{wf}} |
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| Steady State flow regime (SS) |
| LaTeX Math Block |
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| J_r = \frac{2 \pi \sigma}{ \ln \frac{r_e}{r_w} + 0.5 + S} |
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| LaTeX Math Block |
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| J_e = \frac{2 \pi \sigma}{ \ln \frac{r_e}{r_w} + S} |
|
| Pseudo-steady State flow regime (PSS) |
| LaTeX Math Block |
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| J_r = \frac{2 \pi \sigma}{ \ln \frac{r_e}{r_w} + 0.75 + S} |
|
| LaTeX Math Block |
|---|
| J_e = \frac{2 \pi \sigma}{ \ln \frac{r_e}{r_w} + 0.5 + S} |
|
The relation between the total sandface flowrate
, bottomhole pressure and field-average formation pressure during the stabilized reservoir flow:corresponding to linear IPR with constant productivity index :
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where
See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing
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