The Persephone Project joint-venture is made up of Woodside Energy (operator with a 16.67 per cent share); BHP Billiton Petroleum (16.67 per cent); BP Developments Australia (16.67 per cent); Chevron Australia (16.67 per cent); Japan Australia LNG (16.67 per cent); and Shell Development Australia (16.67 per cent).
The project consists of a 6.5 km subsea tie-back of two wells from the Persephone field – located 135 km northwest of Karratha, Western Australia in a water depth 126 m – back to the North Rankin Complex via a 12-inch flow-line.
In March 2015, engineering firm Subsea7 was awarded the contract forsubsea installation, diving and Work Pack 2 fabrication. Subsea7 will undertake fabrication, transportation, installation and pre-commission activities with the firm’s Seven Eagle vessel taking care of all the offshore activities.
Subsea7’s project management and engineering begun immediately after the March announcement with offshore
activities scheduled for later this year.
In August, Woodside announced the commencement of Persephone fabrication
activities and offshore brownfield work andconfirmed the 2018 start-up date.
The company initially aimed for drilling works to commence on the two production well’s topholes in Q4 2015 and reservoir drilling in Q2 2016. A 500 m radius exclusion zone will be in place around the rig for the duration of the drilling program.
CARNARVON PETROLEUM - CERBERUS PROJECT
Status: Seeking partners to advance project to drilling
Secured in May 2014, Carnarvon Petroleum’s wholly owned offshore Cerberus project covers about 3200 sq km in the Carnarvon Basin in Western Australia.
Since then, the firm says nominal work will be undertaken over the following three years.
The latest news from the project states that since permit award, Carnarvon’s geoscience team has significantly de-risked the area The company has so far licensed and
interpreted its 3D Monodon mega-merge survey and undertaken a detailed analysis of 16 Early Triassic and Upper Permian wells that had previously drilled in around the Cerberus blocks to improve its data accuracy.
The company also has undertaken a petro-physical analysis of some 30 wells in the Carnarvon Basin to further enhance its positioning for Cerberus.
Now, with all technical work complete, the firm confirmed in late July it is seeking partners to advance to drilling stage.
“The blocks offer low cost drilling in shallow water with shallow depth reservoir targets, providing Carnarvon with significant value for a modest investment,” the company stated in a recent ASX release.
The two primary drilling targets, Honeybadger and Belfon, lie in 25 - 30 m deep water, around 100 km from the major port of Dampier. The company estimates drilling costs to reach $10 million per well.
Carnarvon has until May 2017 to commit to drilling these wells.
INPEX - ICHTHYS PROJECT
Status: Under construction
The Ichthys 889 km gas export pipeline (GEP) will be one of the largest pieces of subsea infrastructure ever built when completed later this year.
The 42-inch pipeline, composed of some 700,000 t of steel and 550,000 t of concrete, will deliver gas and some condensate from the central processing facility in the Browse Basin to onshore facilities at Blaydin Point near Darwin.
The project’s joint venture partners include INPEX (63.445 per cent), Total (30 per cent), Tokyo Gas (1.575 per cent), Osaka Gas (1.2 per cent), Chubu Electric (0.735 per cent), Toho Gas (0.42 per cent) and CPC (2.625 per cent).
Oil and gas contracting service provider Saipem is the engineering, procurement, construction and installation (EPCI) contractor for the GEP.
Saipem’s semisubmersible pipelay barge, SEMAC-1, is installing the 164 km shallow water section of pipe. This work included laying the first 18 km section of the GEP through Darwin Harbour in mid-2014.