Allseas’ Pioneering Spirit wraps up infield pipelay at biggest project in BP’s portfolio (Gallery)

Allseas has completed the infield pipelay scope for BP’s ultra-deepwater Greater Tortue Ahmeyim (GTA) LNG project offshore Mauritania and Senegal, two months after arriving at the field.

The pipelay scope comprises approximately 75 kilometers of two 16-inch export lines and 10 kilometers of four 10-inch CRA infield lines, with some of the pipeline infrastructure exceeding 2,700 meters of water depth.

Allseas’ construction support vessel (CSV) Oceanic started the offshore campaign in December by landing the first structure in the target box at 2,800 meters of water depth.

Construction vessel Pioneering Spirit now completed the infield pipelay scope. Two months after arriving in the field, production crew welded, scanned and field joint coated the final piece of pipe for the second 16-inch export gas line, Allseas reported today, February 20.

Landed in a two-meter target box at 2,400 meters of water depth, the pipeline will be recovered in J-mode configuration to install the termination assembly. For this, the vessel aft was fitted with a bespoke J-mode frame with a 1,000-tonne load capacity that took only eight weeks to be designed, built and installed on board, the company reported.

The main firing line and double jointing facilities on the vessel ran in parallel throughout the campaign. Pioneering Spirit is set to conclude the offshore works by installing the six outstanding flowline termination assemblies.

“Our Agile approach was key to a quick and efficient start to the project and decision-making process throughout the offshore campaign. Thanks to great collaboration between the onshore and offshore teams, we’ve overcome all challenges faced during the project preparation and execution phases and met all milestones without delay,” said Allseas Project Manager Laurent Beghin.

BP awarded Allseas with a contract to perform the subsea pipelay scope for the GTA natural gas project in October 2023.

The project development envisions the production of gas from an ultra-deepwater subsea system and mid-water floating production, storage and offloading (FPSO) vessel, which will process the gas, removing heavier hydrocarbon components. The gas will then be transferred to an FLNG facility. The first phase is expected to produce around 2.3 million tons of LNG per year.

Golar LNG’s FLNG Gimi, which will work on the GTA project, arrived at the field last month.

As previously reported, BP sees the GTA gas development as “the biggest project” in its portfolio, which has “enough gas to support production for at least 20 years.”

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