One of the Productivity Diagnostics methods based on relation on correlation between pressure drawdown integral | LaTeX Math Inline |
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body | --uriencoded--\displaystyle G integral:...
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{wf}(\tau) - p_e(\tau) \right) d\tau |
and and total sandface flowrate cumulatives | LaTeX Math Inline |
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body | --uriencoded--\displaystyle ...
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where
| production/injection time |
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| LaTeX Math Inline |
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| body | --uriencoded--p_%7Bwf%7D |
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| bottomhole pressure as function of time |
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G(t) = J^{-1} Q_t(t) |
where
In case pressure data is available for a fair interpolation it is recommended to plot sandface cumulatives rather than surface which provides better linearity with pressure integral for Steady-State linearity for stabilized reservoir flow.
Although it is equally applicable to producers and injectors, due to lack of BHP and formation pressure data availability for producers in most practical cases in the past the Hall plot analysis was mostly applied for water injectors.
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