Initial Shut-In Period
Initial Shut-In Period :
(n). Well Testing. The comparatively short shut-in period following the initial flow period of a drillstem test. This period is followed immediately by much longer flow and shut-in periods to allow the pressure to closely approach initial reservoir pressure. The initial flow period is commonly 5 to 10 minutes, and the initial shut-in period is commonly 30 minutes to one hour. When plotted on apressure buildup plot, extrapolation of the best straight line gives what is usually accepted as the best obtainable value of initial formation pressure. See: drillstem test, final shut-in period, formation pressure, initial flow period, initial reservoir pressure
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