WAB® installed to prevent B annulus pressure build-up offshore Turkmenistan

Well construction & integrity
WAB - Welltec Annular Barrier - case story JTM19754


In the Caspian Sea, offshore Turkmenistan, many wells experience cement channeling during completion that cause issues with B annulus pressure buildup.

To resolve this issue, a client contacted Welltec® regarding the Welltec Annular Barrier (WAB) for cement assurance. Welltec worked with the client to identify a well candidate for a trial job with the WAB.


In March 2019, Welltec mobilized a 1214 WAB to a vertical offshore well. The WAB was used for cement assurance as part of the 9-5/8” casing, installed 50m (165 ft) above the 13-3/8” casing shoe.

As the drillers ran the WAB during casing deployment, the Welltec engineer monitored and controlled the WAB expansion and cementing from the driller’s office onshore. WAB expansion took 20 minutes with changing the cementing unit and packer activation. The operation was completed successfully without issue.

The client was pleased with Welltec’s performance and is confident in the WAB installation procedure.


The Head of Drilling had previously worked with Welltec and had prior experience with the WAB’s ability to provide an economical and quality cement assurance solution.

To solve the B annulus pressure problem, he reached out to Welltec. Welltec completed this operation quickly and without issues.

The WAB significantly reduces the risk of B annulus gas migration and could be a cost-effective solution for other wells offshore Turkmenistan as well as globally, to resolve common pressure build-up issues from cement channeling.

Well construction & integrity
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