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Ratio of the variation of the field-average formation pressure in producers to the total field cumulative water injection
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{\rm PIR}RIR}(\delta t) = \frac{<p \left<p_e(t=T)>-<p+\delta t) \right>_{\rm PROD} - \left<p_e(t=0)>}{Q)\right>_{\rm PROD}}{Q^{\downarrow}_{WI}(t+\delta t) - Q^{\downarrow}_{WI}(t=T) } |
It measures normally makes sense for the matured reservoirs with pressure depletion and indicates how efficiently waterflood supports the recovery of formation pressure in producers.
It and represents one of the key Waterflood Diagnostics.
See Also
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Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis / Waterflood Diagnostics
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