Heerema Marine Contractors’ semisubmersible crane vessel Thialf has completed the installation of Cassia compression (Cassia C) platform on behalf of client bp Trinidad and Tobago (bpTT).

The installation is located off Trinidad’s east coast and marks a significant milestone in the Cassia C project. The Cassia C platform will enable bpTT to access and produce low-pressure gas reserves from currently-producing fields in the Greater Cassia area, thereby maximizing recovery from these existing resources.

Heerema installed the Cassia C jacket in 2020 with Sleipnir, and on July 27, finalized completion activities for the installation of the topside, bridge, and flare structures. The transportation of the structures was also Heerema scope, and they arrived in Trinidad and Tobago on July 15 from the Altamira fabrication yard.

The topside of approximately 7,800 metric tons was installed first, with the other structures following. The next step in the project will be the hook-up and commissioning of the Cassia C platform. Thialf will now return to the North Sea to continue a busy summer season.

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Michael Daniel, project general manager, bpTT said, “We have marked an important step in the Cassia compression project with the installation of the topsides. This is a great achievement for the teams in Mexico and T&T which had to work through challenges brought about by COVID-19. The Cassia Compression project will be a major component of improving our production deliverability and the installation of the topsides brings us one step closer to first gas.”

Gas production from the Greater Cassia Area will be routed to the Cassia C platform for compression before being transported via the adjacent existing Cassia B platform. Cassia C will be located 57 kilometers off the southeast coast of Trinidad. The platform will have a throughput capacity of 1.2 billion standard cubic feet of gas a day (bcfd). First gas from the platform is expected in 2022.