The external and internal alterations may affect the wellbore cement stability throughout the setting period. These alterations generate micro/macro fractures in the cement matrix. Such situation, known as Sustained Casing Pressure (SCP), may result in creating pathways for any undesired formation fluid flow through surface and/or other formation(s) behind the casing annulus. The cement exothermic heat development is one of the probable internal alteration to cause SCP evolution.

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