Well Test Duration Calculator PRO
Estimate the minimum well test duration to achieve stabilization and reach the desired radius of investigation.
Reservoir Properties
Results
Time to rinv
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Wellbore Storage End
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Min. Test Duration
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Diffusivity (ft²/hr)
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rinv at 24 hr
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rinv at 72 hr
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How this was calculated
Radius of investigation: rinv = √(k · t / (948 · φ · μ · ct))
Time to reach rinv: t = 948 · φ · μ · ct · rinv² / k
Wellbore storage end: twbs ≈ 948 · φ · μ · ct · (60 · rw)² / k
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The minimum duration of a well test depends on reservoir properties and the desired depth of investigation. The radius of investigation formula determines how far the pressure transient has propagated into the formation. Testing must last long enough to pass wellbore storage effects and reach the features of interest. Built by Groundwork Analytics.