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Moving to annual time step may accumulate a substantial mistake if formation pressure has varied substantially in some years.
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| title | Polynomial approximations for WeD |
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Polynomial approximation of are available (http://dx.doi.org/10.2118/15433-PA).
Table 1. |
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Polynomial approximation of for infinite aquifer | | LaTeX Math Inline |
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| body | W_{eD}=\sqrt{\frac{t_D}{\pi}} |
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| body | \displaystyle W_{eD}=\frac {1.2838 \cdot t_D^{1/2} + 1.19328 \cdot t_D +0.269872 \cdot t_D^{3/2} +0.00855294 \cdot t_D^2} {1+0.616599 \cdot t_D^{1/2}+0.0413008 \cdot t_D} |
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| body | \displaystyle W_{eD}=\frac{-4.29881+2.02566 \cdot t_D}{\ln t_D} |
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Scope of Applicability
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The benefit of VEH approach is that net pay formation pressure history
is usually known so that water influx calculation based on aquifer properties
| LaTeX Math Inline |
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| body | \{ B, \, r_a, \, \chi \} |
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is rather straightforward.
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