Injectivity Index Formula
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\( II \;=\; \dfrac{ q }{ p_{wf} - p }\) (Injectivity Index) \( q \;=\; II \cdot ( p_{wf} - p) \) \( p_{wf} \;=\; \dfrac{ q }{ II } + p \) \( p \;=\; p_{wf} - \dfrac{ q }{ II } \) |
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| Symbol | English | Metric |
| \( II \) = Injectivity Index | \(bbl \;/\; day \;/\; psi\) | - |
| \( q \) = Injection Well Flow Rate | \(bbl \;/\; day\) | - |
| \( p_{wf} \) = Well Flow Pressure (psi) | \(lbf \;/\; in^2\) | - |
| \( p \) = Reservoir Pressure (psi) | \(lbf \;/\; in^2\) | - |
Injectivity index, abbreviated as II, is used to evaluate the performance of a well when injecting fluids, such as drilling mud or other injection fluids, into the reservoir. It quantifies the ease with which a well can accept injected fluid and is a critical measure for understanding the efficiency of fluid injection operations.
