Prelude FLNG; Source: Shell

Shell ready to embark on seabed survey activities at natural gas field

Shell Australia, a subsidiary of oil major Shell, has tucked a green light for its environment plan (EP) under its belt from the country’s offshore regulator for a seabed survey on the Crux natural gas field off the coast of Western Australia.

Prelude FLNG; Source: Shell

The National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) confirmed the approval of Shell’s environment plan in December 2023, enabling the oil major to undertake the Crux seabed survey within production licenses AC/PL1 and WA-33-PL.

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This seabed survey will encompass a geophysical survey and a geotechnical survey to investigate sub-seabed geological conditions to understand conditions at the proposed pipeline pipelay initiation and the pipeline end manifold (PLEM) locations for the Crux pipeline.

In addition, the aim is also to check geological conditions for proposed pipeline end terminations (PLET) foundations at both the Crux and Prelude ends of the proposed Crux pipeline; identify potential seabed debris and obstructions; identify and map the nature and distribution of seabed surface types along potential pipeline routes; and accurately measure water depth and map seabed topography.

The Crux seabed survey will be carried out in Commonwealth and Ashmore Cartier marine waters, 200 km offshore northwest Australia and 460 km north-northeast of Broome, in 160 m to around 260 m from mean sea level (MSL) water depth. This is expected to take one week.

In a worse-case scenario, the survey could take up to 30 days which accounts for unforeseen circumstances and potentially more survey activities. The survey is currently planned to occur within a single campaign in 2024.

The Shell-operated Crux development, sanctioned in May 2022, is located in Commonwealth waters in the northern Browse Basin, 190 kilometers offshore northwest Australia and 620 km northeast of Broome, in approximately 165 meters of water depth.

The Crux joint venture, which comprises Shell Australia as the operator and SGH Energy as its joint venture partner, is progressing the project. The first environmental approval for Crux was the Crux Offshore Project Proposal (OPP), which was accepted in August 2020 by NOPSEMA.

According to Shell, the Crux gas field has been identified as a source of backfill gas for the existing Prelude floating liquefied natural gas (FLNG) facility. As a result, Crux will have the capacity to supply the Prelude FLNG facility with up to 550 million standard cubic feet of gas per day (mmscfd).

The development of this project will consist of a platform operated remotely from Prelude while five wells are expected to be drilled initially. Moreover, an export pipeline will connect the platform to Prelude, around 160 kilometers southwest of Crux. Shell anticipates the first gas in 2027.



𝐃𝐨 𝐲𝐨𝐮 𝐰𝐚𝐧𝐭 𝐭𝐨 𝐠𝐫𝐚𝐛 𝐭𝐡𝐞 𝐚𝐭𝐭𝐞𝐧𝐭𝐢𝐨𝐧 𝐨𝐟 𝐲𝐨𝐮𝐫 𝐭𝐚𝐫𝐠𝐞𝐭 𝐚𝐮𝐝𝐢𝐞𝐧𝐜𝐞 𝐢𝐧 𝐨𝐧𝐞 𝐦𝐨𝐯𝐞? 𝐋𝐨𝐨𝐤 𝐧𝐨 𝐟𝐮𝐫𝐭𝐡𝐞𝐫 𝐭𝐡𝐚𝐧 𝐎𝐟𝐟𝐬𝐡𝐨𝐫𝐞 𝐄𝐧𝐞𝐫𝐠𝐲! 𝐎𝐮𝐫 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐢𝐬 𝐫𝐞𝐚𝐝 𝐛𝐲 𝐭𝐡𝐨𝐮𝐬𝐚𝐧𝐝𝐬 𝐨𝐟 𝐩𝐫𝐨𝐟𝐞𝐬𝐬𝐢𝐨𝐧𝐚𝐥𝐬 𝐞𝐧𝐠𝐚𝐠𝐞𝐝 𝐢𝐧 𝐨𝐢𝐥 & 𝐠𝐚𝐬, 𝐦𝐚𝐫𝐢𝐭𝐢𝐦𝐞, 𝐨𝐟𝐟𝐬𝐡𝐨𝐫𝐞 𝐰𝐢𝐧𝐝, 𝐠𝐫𝐞𝐞𝐧 𝐦𝐚𝐫𝐢𝐧𝐞, 𝐡𝐲𝐝𝐫𝐨𝐠𝐞𝐧, 𝐬𝐮𝐛𝐬𝐞𝐚, 𝐦𝐚𝐫𝐢𝐧𝐞 𝐞𝐧𝐞𝐫𝐠𝐲, 𝐚𝐥𝐭𝐞𝐫𝐧𝐚𝐭𝐢𝐯𝐞 𝐟𝐮𝐞𝐥𝐬, 𝐬𝐡𝐢𝐩𝐩𝐢𝐧𝐠, 𝐚𝐧𝐝 𝐨𝐭𝐡𝐞𝐫 𝐢𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐨𝐧 𝐚 𝐝𝐚𝐢𝐥𝐲 𝐛𝐚𝐬𝐢𝐬.

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