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What is <strong>Trapped</strong> <strong>Annular</strong> <strong>Pressure</strong>?<br />
(or <strong>Annular</strong> <strong>Pressure</strong> Buildup)<br />
•When cement is not<br />
circulated back to surface,<br />
drilling fluids or spacers<br />
become trapped in the<br />
annulus between the top of<br />
cement and the wellhead<br />
•Heat from produced oil/gas<br />
/water causes thermal<br />
expansion of these trapped<br />
annular fluids and can create<br />
more than enough pressure<br />
to collapse casing and tubing<br />
strings
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