Synonym: Cumulative Productivity Plot = Hall Plot
One of the Productivity Diagnostics methods based on correlation between cumulative pressure drawdown:
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| production/injection time | ||||||||||
| total sandface flowrate as function of time
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| drain-area formation pressure as function of time
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| bottomhole pressure as function of time
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| Fig. 1. Hall Plot |
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| constant productivity index |
Due to integration procedure the Hall Plot has a better tolerance to uncertainties in formation pressure and bottomhole pressure comparing to Unweighted J-plot and usually results in more accurate estimation of productivity index.
It is highly recommended to plot sandface flowrates rather than surface flowrates to achieve better linearity in correlation for stabilized reservoir flow.
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| LaTeX Math Block | ||
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G(t) = \int_0^t \left( p_{wf}(\tau) - p_e(\tau) \right) d\tau = \sum_k \left( p_{wf}(\tau_k) - p_e(\tau_k) \right) \delta \tau_k |
See Also
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Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis / Productivity Diagnostics
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