Primary Barrier protecting the A Annulus from SCP
Well typeHigh pressure gas producer
7500 PSI ISO14310 V0* qualificationAllows for WAB to be used as standalone barrier
VO**leak rate criteria
Opex effectiveWell construction negates need to manage SCP
Simplified well constructionReduces risk, complexity and provides life of well
WAB rotational capabilityEnhanced primary cementing operation
Initial designs considered cement to surface. However. uncertainty was recognized regarding the ability of the cement to seal against gas pressure due to micro annulus, along with the reliability of the cement integrity over life of well.
The initial design was to expand the V0 812WAB within the cement, providing cement assurance. Further review recognized the benefits of setting the Welltec Annular Barrier® (WAB) shallow of the cement, enabling a contingency expansion against cured cement in the event the float shoe did not seal.
The robust nature of the WAB enabled casing rotation during cementing. The WAB was quickly expanded upon bumping the cement plug, while under full surface control.
Sealing integrity of the WAB was verified via an annular pressure test, fully meeting the primary well barrier requirements.
V0 rated primary barrier facilitates CAPEX-effective, cemented mono bore in HP gas well.
Through its versatility in application and robustness in design, the WAB (Welltec Annular Barrier) for well completions can be utilized to provide solutions, to many requirements throughout the completion phase of a well.