One of the Steady-State Diagnostics methods Productivity Index diagnostics methods based on plotting pressure integral
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| body | P(t) = \int_0^t \left( p_{wf}(\tau) - p_e(\tau) \right) d\tau |
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vs
cumulatives | LaTeX Math Inline |
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| body | Q(t) = \int_0^t q_t(\tau) d\tau |
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It shows unit slope for Steady-State stabilized reservoir flow:
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P(t) = J^{-1} Q(t) |
where
In case pressure data is available for a fair interpolation it is recommended to plot subsurface cumulatives rather than surface which provides better linearity with pressure integral for Steady-State flow.
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