Shell Crux Development Proposal

Project name: 

Crux Development



Submitted by:

Shell Australia Pty Ltd



AC/RL-9, AC17-4, AC-17-5, AC/P41


Submission type:








Project description

Shell Australia Pty Ltd (Shell), together with joint venture partners Seven Group Holdings Energy and Osaka Gas, are progressing plans for the prospective development of the Crux gas field, located approximately 160 kilometres north-east of the Prelude field in the northern Browse Basin, offshore Western Australia. The Crux field is located in Commonwealth waters in the northern Browse Basin, 190 kilometres offshore north-west Australia and 620 kilometres north-north-east of Broome.

The Crux project has been identified as the primary source of backfill gas supply to the Prelude Floating Liquefied Natural Gas (FLNG) facility. The proposed Crux project consists of a not normally manned (NNM) platform in water depths of approximately 165 metres of water; with five production wells, minimal processing and utility systems, tied back to the existing Prelude FLNG facility via a 165 kilometre export pipeline. Crux will be operated remotely from the Prelude FLNG facility. Front-end engineering and design for the project is expected to commence in 2019 with the financial investment decision (FID) currently scheduled to occur in 2020. The project is anticipated to have a 20-year design life. However, subject to the future investment decisions, the project may extend.

The current project concept comprises:

  • a NNM platform, which includes dry trees, processing facilities and associated utility systems

  • five production wells with subsea wellhead system tied back through rigid concentric tubulars to the NNM platform and completed with dry trees 

  • a 26-inch export pipeline, approximately 165 km long, which ties the platform back to the Prelude FLNG facility, and

  • subsea integration system connecting the export pipeline system with Crux platform and the Prelude FLNG facility, comprising risers, subsea isolation facilities, pipeline inspection gauge receiver and associated control systems.

There is also a potential for future subsea developments that will provide hydrocarbons to the Crux platform. These developments are expected to comprise subsea production wells, completed with subsea trees, and associated subsea tie-back to the platform (e.g. flowlines, risers and manifolds).

From FID it will take approximately four to five years for the platform to be fully designed, constructed off-site and towed to location. Whilst the platform is being built, the subsea production wells would be drilled and suspended until installation of the platform facilities, after which the wells would be completed, hooked-up to the platform and brought online. Decommissioning will be undertaken at the end of field operations.

The key execution stages of the project are:

  • development drilling, including tie-back and dry tree completion

  • installation of the platform jacket and topsides 

  • installation and hook up of export pipeline and subsea integration system to the platform facilities 

  • commissioning 

  • operations and maintenance (note, this includes any future subsea tie-back developments within the in-field development area), and 

  • decommissioning.

Additional gas reservoirs within the in-field development area may be tied back to the Crux platform. The development of these reservoirs will broadly involve the same key stages and activities as those used in the development of the Crux field, with the exception of completion with subsea trees.

OPP documents

The proposal can be downloaded using the link below:

OPP - Crux Development - Rev 7 - August 2020 (PDF 17MB)

OPP - Crux Development - Appendices - Rev 7 - August 2020 (PDF 132MB)

Statement of reasons - Acceptance Crux Development project OPP - August 2020 (PDF 11MB)

Draft for public comment - Crux Development - February 2019 (PDF 153MB)


Proponent contact for further enquiries

Shell Principal Environment Adviser 

Dani Thompson

Phone: + 61 8 933 869 72


Mailing address:               

Shell House                    

562 Wellington Street               

Perth WA 6000          

Quick links

Media statement - NOPSEMA accepts Shell Crux Offshore Project Proposal - 04 August 2020 (PDF 105KB)

Introduction to Offshore Project Proposals

Community Information

Making public comment on offshore project proposals information paper (PDF 239KB)

Offshore project proposal assessment policy (PDF 288KB)

Brochure - Offshore petroleum environmental approvals - July 2020 (PDF 5.9MB)