The Barossa offshore development area encompasses petroleum retention lease NT/RL5 (the Barossa Field), where initial development would occur, and potential future phased development in the smaller Caldita Field to the south in retention lease NT/RL6.

The development concept notionally involves drilling nine subsea wells in two phases (six in the first phase).

Barossa Field Infrastructure

Click on the icons below to learn what each piece of subsea equipment does

Fibre Optic Cable
FPSO
Gas Export Pipeline
Manifold
Mooring Lines/Anchors
Production Flowline
Riser Base Manifold
Risers
Service Flowline
Static Umbilical
Well Jumper
Xmas Trees
Map Key
Infrastructure
Infrastructure

Fibre Optic Cable

Provides a communication channel between the subsea infrastructure and the FPSO (and beyond)

Infrastructure

FPSO

Floating Production Storage and Offloading facility: separates the reservoir fluids into separate gas and condensate streams. Condensate is transferred directly to specialised tankers for export, and dry gas is treated and sent for onshore processing via the Gas Export Pipeline.

Infrastructure

Gas Export Pipeline

Transports the export quality dry gas from the FPSO to the tie-in point

Infrastructure

Manifold

Performs routing/isolating of the subsea wells to/from the designated pipelines

Infrastructure

Mooring Lines/Anchors

Securing the Barossa FPSO in the designated position within the field

Infrastructure

Production Flowline

Transports raw well gas from the subsea wells to the FPSO

Infrastructure

Riser Base Manifold

Performs routing of the production gas from a subsea pipeline into a riser

Infrastructure

Risers

Connect the underwater pipeline to the FPSO through its turret

Infrastructure

Service Flowline

Used primarily in support of well start-up and shutdown operations

Infrastructure

Static Umbilical

Extension to the dynamic umbilical: delivers the necessary controls and utility fluids required for subsea operations

Infrastructure

Well Jumper

Pipe spool that connects the Xmas tree to the production manifold

Infrastructure

Xmas Trees

Contain the control and isolation valves and all instrumentations to enable operation and maintenance of the subsea wells

FPSO Facility

The Floating Production Storage and Offloading facility (FPSO) will be a ship shaped facility and will separate the reservoir fluids extracted from the Barossa Field into separate gas and condensate streams. The condensate will be exported directly from the FPSO to offtake tankers. The gas will be dehydrated, treated for partial CO2 removal, and transported via a gas export pipeline for onshore processing.  The processing, storage and offtake (export) facilities (i.e. topside facilities) will all be mounted to the hull of the FPSO.

The FPSO will be permanently moored to the seabed from the turret and built to withstand a 10,000-year storm.

SUBSEA PRODUCTION SYSTEM (SPS)

The SPS controls delivery of gas from the wells to the FPSO. It comprises Xmas trees which are connected to the top of the well to control the gas flow; production manifolds that direct gas and condensate into the flowlines; diverless connectors which join the subsea flowline network together; and production control system which commands the subsea valves and monitors instrumentation.

SUBSEA UMBILICALS, RISERS, AND FLOWLINES (SURF)

The SURF scope involves equipment which connects the development wells to the FPSO and FPSO to the export pipeline. Umbilicals provide the necessary hydraulic and electrical power, communications and chemical injection capability required for subsea operations. Flowlines transport raw gas and fluids from the subsea wells to the risers. Risers connect the infield flowlines and export pipeline situated on the seabed to the turret on the FPSO. 

GAS EXPORT PIPELINE (GEP)

Dry gas will be transported from the FPSO via a new 260km pipeline (GEP) to a tie‐in point on the existing Bayu‐Undan pipeline (approximately 130km offshore from Darwin). A pipelay vessel which welds 12m long joints of pipe together will install the GEP by laying the pipe onto the seabed. The installed pipeline is then connected to the risers at the FPSO on one end, and the Bayu‐Undan pipeline at the other end using spools. 

FIBRE OPTIC CABLE

Multiple options are being investigated to provide fibre optic telecommunications to the FPSO; including tie-in to the existing offshore fibre infrastructure in the region, and installation of a dedicated Barossa system. The fibre optic cable will provide a reliable and stable high-speed data service that allows effective and efficient operations at the FPSO.

See the interactive map at the top of the page to learn about the equipment.