Start of Environmental Assessment for the Subsea Drilling and Installation of Julimar Phase 3, Western Australia, Focusing on Projected Lifetime and Existing Infrastructure.
The Australian regulatory body NOPSEMA is conducting the environmental assessment of Woodside Energy’s plans for the subsea drilling and installation of Phase 3 of the Julimar development.
The site where Julimar is located is in waters off Western Australia, approximately 170 km northwest of Dampier.
The Phase 3 development by Woodside will include the drilling of up to four wells in the Julimar field and one well in the Penfolds prospect, along with the related subsea installation. The production system will have a projected lifespan of 25 years and will extract hydrocarbons from the Julimar and Penfolds reservoirs, using the existing infrastructure from Phases 1 and 2, the third-party operated Wheatstone platform, and the onshore LNG plant. The environmental assessment will be a crucial point in this process to ensure the sustainability of operations.
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Expansion of the Environmental Assessment of the Julimar Development
Wells will be drilled by a semisubmersible MODU anchored or by a hybrid MODU with moorings and dynamically positioned systems. The drilling is expected to last 60 days per well.
Environmental Assessment and Sustainable Development
In 2021, as part of Phase 2 development, Woodside Energy and Subsea 7 delivered what was believed to be the largest diameter corrosion-resistant Alloy (CRA) piping ever ‘wrapped’ around a spool. The project involved the installation of 22 km of an 18-inch CRA coated gas transmission flowline.
Environmental Assessment in Offshore Drilling
For Phase 3, two wells are proposed to connect to a new two-slot production manifold that will connect to the existing T-line manifold within the 18-inch flowline via approximately 2.5 km of flexible flowline.

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