Event key details
Webinar - 0900 BST
1st July 2020
The initial proposal for abandoning the Curlew subsea field was to carry out the pre-abandonment work from the LWIV followed by the complete P&A operation conducted by a MODU. During the detailed design of the work scope, four wells out of six were identified as through-tubing abandonment (TTA) candidates. To maximize the use of the LWIV and optimize the MODU sequence these TTA operations were planned to be executed from the LWIV. The TTA cement plug is installed by circulating cement down the production tubing and taking returns from the annulus to place the cement plug above the production packer and deep-set plug. An agitator tool is installed in the production tubing to improve the cement coverage in the annulus. As the LWIV does not have a permanently installed cementing system, a temporary system was fitted on the vessel which proved to be challenging given the deck limitations of the installation.
Two of the four TTA candidate wells included a downhole gauge cable in the completion design across the zone that was required to be cemented. To ensure the long-term integrity of the TTA cement plug with the gauge cable, an expanding self-healing cement was utilized to account for cable degradation over time.
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Please note time is at 0900 BST