UGL has won a $120 million contract to provide services at Santos' Curtis Island LNG facility.
The contract will run over three years and includes an option to extend work at the site for an additional four years.
Under the agreement UGL will perform maintenance, shutdown, engineering, and project services for the LNG facility.
It will mobilise to site in the second quarter of the year.
UGL welcomed the win, with CEO Ross Taylor stating: "This contract, along with the recent announcement of the APLNG maintenance contract further enhances UGL's strong base of recurring revenue and positions us well for future maintenance opportunities as LNG facilities currently under construction move into their operational phase."
The final module for GLNG was installed in November last year, with first gas reaching the project earlier this month.