Annular Pressures

DeepAssurance™ Cementing Solution SuiteUnless designed for these anticipated events, changes in temperature and pressure, mechanical shocks during drilling and completion can all create repetitive loading that can lead to stress failure of the cement sheath, which in turn can result in annular pressure buildup (also known as sustained casing pressure). Studying and testing the mechanical behavior of the cement (Young’s modulus, Poisson’s ratio, tensile strength, onset of static gel strength, etc.) under the defined wellbore conditions can significantly increase the probability of designing a zonal isolation solution that withstands the demands of completion and production. 

Additionally, spacer systems can be designed to help mitigate risk.  These systems can involve hollow ceramic or glass spheres that collapse to help prevent pressure build up from expansion.  Or, these systems can be designed for compression with a process involving nitrification of the spacer during placement. 

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Summary Rigless Micro-channel Remedation Using WellLock Resin Sep 2014
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Solutions for Annular Pressures

Cement Systems

iCem® Service
Latex 3000™ Cement Additive
WellLife® 734 Additive
WellLife® Service
WellLock® Resin
ZoneSeal® Isolation Process

Annular Pressures - Challenges

Annular Pressure Challenges If Unaddressed
Avoid fluid(s) or gas(es) trapped behind the casing without accessible bleed points.

Casing pressure (potentially leading to casing failure) due to thermal expansion of trapped fluids heated from the higher temperatures of produced fluids.

Avoid damage due to trapped annuli when casing is cemented, yet top of cement resides in previous casing.

Casing damage and the potential for lost production or even loss of the well if the casing damage is severe.

Successfully maintain zonal isolation throughout the cumulative stresses sustained during completion, production, shut-in, and bringing back onto production.

Damaged cement sheath integrity requiring release of the annular pressure (bleed off), well remediation, or abandonment.

Prevent flow paths from forming in the cement sheath due to formation fluids or gases percolating into the slurry during transition from liquid to solid state, particularly at the point when hydrostatic pressure is no longer transferred to the formation.

May require a range of responses from remediation to well abandonment.

Related Information

Related Information


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