The contract extension is worth an estimated $150 million.

Bayu-Undan consists of a floating storage and offloading facility and three fixed platforms, a remote wellhead platform and a compression, utilities and quarters platform that is bridge-linked to a drilling, production and processing platform.

Clough AMEC is an incorporated JV established to provide brownfield engineering, operations and maintenance services to the Australasian oil and gas industry.

It has provided asset integrity management and implementation services to the Bayu-Undan facilities since 2004.

Yesterday the Federal Court of Australia approved the scheme of arrangement allowing South African engineering company Murray & Roberts to buy all the shares in Clough it does not already own.

Clough expects to lodge a copy of the court orders with the Australian Securities and Investments Commission today, at which point the Clough scheme of arrangement becomes effective.

Last week Clough shareholders voted to accept the scheme of arrangement.