Project Profile
Value: US$129 million
Location: WA-13-L, Australia
Water Depth: 112 metres
Upstream Gas Reserves: 100 billion ft³
Exploration start-up: 2008
Production start-up: June 2011
The Halyard gas and Condensate field is located in permit WA-13-L in the Carnarvon Basin, offshore Western Australia in 112 metres of water. Spar is situated in permit WA-4-R about 70 kilometres west of Varanus Island, and roughly 2 kilometres from Halyard. Discovered in April 2008 by the Stena Clyde drillship, the Halyard well reached a planned total depth of 2,815 metres, intersecting 28 metres of net gas pay in Valanginian age Barrow Group reservoir, interpreted as wave-dominated shoreface sandstone. The well flowed at a peak rate of 68 Mmcf/d of gas and 936 barrels of condensate per day from 28 metres of net gas pay in the Cretaceous Halyard sandstone. Subsequently, the discovery was then completed as a production well. Halyard-1 will be tied back to the Varanus Island hub, via the existing East Spar subsea infrastructure. The control will come from the existing John Brookes wellhead platform.
The Halyard/Spar project involves connecting the wells to the Spar gas field; first, the Halyard well will be developed, followed by the tie-in of the Spar-2 well. The project received governmental approval for field development in the second quarter of 2008, with production from Halyard expected to commence in February 2011, followed by Spar in late 2012.
At an estimated cost of US$129 million, Halyard connects to an existing pipeline at the East Spar field, about 32 kilometres to the southeast, and transports gas to Varanus Island for processing. Control will come from the existing John Brookes wellhead platform. In September 2010, TSmarine received a contract to transport and install 16km of flexible flowline and 28km of control umbilical connecting the Halyard-1 well to the existing East Spar subsea infrastructure on Varanus Island off Western Australia’s Pilbara coast. As part of the Halyard development, TSmarine installed three new modules on the John Brookes platform to handle the extra production. The field was fully developed in 2011 with production commencing on June 2, 2011. Development of the Spar field, located in adjacent license WA-4-R, was expected to follow in late 2012 as additional capacity becomes available at Varanus Island.
Operators:
Quadrant Energy: Operator with 55% interest
Santos: 45% interest
Contractors:
TSmarine: Installation of flexible flowline and control umbilical