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{\rm RIR}(\delta t) = \frac{ \left<p_e(t+\delta t) \right>-\left<p_e(t)\right>}{QQ^{\downarrow}_{WI}(t+\delta t) - QQ^{\downarrow}_{WI}(t) } |
It normally makes sense for the matured reservoirs with pressure depletion and indicates how efficiently waterflood supports the recovery of formation pressure in producers.
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