Tubing/annulus Integrity
This refers to the integrity of the production tubing. Common threats to tubing integrity are erosion and corrosion by production fluids, which denude the steel. The other threat is pressure differential between the tubing and the 'A' annulus. If it exceeds the rated pressure of the tubing, there is a risk of tubing burst or tubing collapse.
This refers to the integrity of the casing strings, which bound the annuli. All annuli will naturally be filled to some level with brine or other fluids from the completion, though the 'A' annulus may have gas down to the lowest gas lift valve if the well is gas lifted. The major integrity issues comes from the differential pressure across the casings due to the weight of brine on either side. To protect well integrity, each annulus will have a Maximum Allowable Annulus Surface Pressure.
Read more about this topic: Well Integrity
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