These are external pressures which are “imposed” into the well. Since the well is open to the atmosphere, the well must be “shut-in” for there to be an imposed pressure. This type of pressure will always be felt uniformly throughout the shut-in well. Imposed pressures originate from:
1. the pumps (i.e. when testing a casing shoe)
2. the formation (i.e. when the well kicks)
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