Well condition conditions at which the annulus pressure is building up after bleed-off.
This is normal behaviour if the annulus is connected to tubing by completion design (through the tubing shoe or an open valve).
In case the annulus is supposed to be sealed has a packer installed then SAP indicates that there is a breach in inner pipe or outer pipe the packer or the inner/outer pipes of the annulus leading to a fluid leakage.
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See Also
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Petroleum Industry / Upstream / Data Acquisition Petroleum Well / Well completion
[ Well & Reservoir Surveillance / Leak Detection]