Deck Extension - Anoa, Indonesia

Project location

The Anoa Field is part of the Natuna Sea Block A located approximately 1,100 km north of Jakarta, offshore Indonesia. It is owned by Premier Oil and has been in operation for more than 28 years. Expansion in line was needed in line with the new requirements. Conbit was chosen for the task because of its extensive experience and know-how on special lifting outside the crane reach. It offers a high level of combined engineering support and execution expertise, making it the best partner for this deck extension project.

Engineering 

To expand the capacity of Premier Oil-owned Anoa Platform, Conbit delivered detailed engineering and design. They had an initial site visit to collect the necessary information to develop a technical plan for the installation. During the site visit, one of the issues identified was that the current design of the platform extensions requires some modification to enable an efficient structure with minimized offshore exposure.

Furthermore, the connectors on the deck extension should fit in the platform receivers. Otherwise, it can cause some risk. Conbit provided a dimension control plan to help the client redesign the extensions with minimal risks. 

As a further step, Conbit built up a double lift boom system capable of lifting the items (max 10mt) directly from a supply vessel. 

Before the execution, every step of the installation procedure was analyzed, evaluated, and adjusted until the safest and most effective was defined. 

Lifting and installation 

Conbit team kicked off the operation using rigging lines to help install modular lift booms under the helideck. Dynamic and static load tests were conducted with water bags to ensure a robust lifting system.

The deck extension and modules were lifted using a temporary lift system operated from the platform of a supply vessel located near the designated installation location. The team used lift lines and tag lines to position the deck extensions. They also used skidding equipment to place two LQ and MPR on the platform.

Despite the increasing demands and scope of the project, Conbit was able to handle and deliver without any delays and disruptions. 

After the deck extension installation, the temporary living quarters were added using lift lines and skidding equipment. The last function was delivered by lowering the MPR on top of one of the living modules. 

Conbit performance and execution exceeded the client’s expectations. The project was successfully completed in 13.5 days.