Gorgon LNG Project (Landfall)

Type of project: Gas infrastructure

Client: Chevron
Location: Barrow Island, Western Australia, Australia
Completed in: 2012

The Gorgon LNG Project was one of the world’s largest liquefied natural gas developments and the largest single resource project in Australian history. Situated on Barrow Island, a Class A Nature Reserve, the project comprises a three‑train LNG facility with a total capacity of 15.6 million tonnes per annum, along with a domestic gas plant capable of supplying up to 300 terajoules of gas per day to Western Australia.

Due to the island’s environmental sensitivity, Horizontal Directional Drilling (HDD) was selected to deliver the onshore–offshore landfall installations with minimal disturbance to surrounding ecosystems.

Scope of Works
The project involved the construction of nine HDD shore crossings, each approximately 490 metres in length, including:

• Three 26‑inch diameter boreholes for the installation of 18‑inch casings
• Four 16‑inch diameter boreholes for the installation of 8‑inch and 10‑inch product lines
• Two 48‑inch diameter boreholes for the installation of 34‑inch product lines

Supporting Activities
Works also included all associated support activities, encompassing the construction and maintenance of launch pits and work areas, as well as the provision, transport and management of consumables, materials and specialist equipment required to deliver the HDD scopes safely and efficiently.