Apache to develop Halyard gas field off W. Australia

Rick Wilkinson
OGJ Correspondent

MELBOURNE, Aug. 17 -- Apache Energy is planning to develop its Halyard gas field in permit WA-13-L off Western Australia via the existing East Spar subsea manifold.

The proposed design allows for additional production wells to be tied into the Halyard subsea systems if there is new exploration success in the surrounding area.

The Halyard facilities will be capable of producing 160 MMcfd of gas via East Spar and subsea pipeline to Apache’s production facilities on Varanus Island and then on to the mainland gas grid.

Halyard gas will be sent to East Spar through a 16-km flexible flowline. Well control will be via a 28-km umbilical from the nearby John Brookes field production platform.

Apache has slated this year’s fourth quarter for Phase 1 of the development. This will comprise laying of the East Spar pipeline end manifold along with associated spool and hardware plus the umbilical J-tube and subsea clamps for the J-tube on John Brookes.

The 2-week installation will require saturation diving from a dynamically positioned dive support vessel, but exact timing is reliant on securing a suitable vessel.

Phase 2 is scheduled for first-quarter 2011 and will be done from an installation support vessel over a period of 3 weeks. This work will include installation of the flexible flowline, umbilical, Halyard pipeline end manifold, subsea distribution unit and tie-in spools on the seabed as well as modifications to the John Brookes platform.

Halyard field was discovered in 2008 when it tested 68 MMcfd of gas along with 936 b/d of associated condensate from a 91-m net pay zone in the Cretaceous-age Halyard sandstone (OGJ Online, Apr. 9, 2008).

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