McDermott has been awarded a large engineering, procurement, removal and disposal contract by Santos for the decommissioning of the Harriet Alpha platform and associated infrastructure, located offshore Western Australia. McDermott defines a large contract as valued between $50 million and $250 million.
The contract follows the execution of the Campbell decommissioning project for Santos in Australia this September.
Part of the Harriet Joint Venture (HJV) assets, the Harriet Alpha platform is one of the largest facilities slated for decommissioning. The HJV comprises 15 platforms/structures in total and the Simpson facilities pipelines. Decommissioning activities are slated to kick off in early 2025.
The contract scope includes engineering, procurement, and fabrication of specialized equipment, as well as the removal and transportation of the platform structure to an onshore facility for dismantling and disposal. McDermott will also be responsible for the removal, transportation, and disposal of a flare tower, exploration well, and subsea development system comprising two subsea template wells.
The Harriet Alpha platform began producing oil in 1986. The structure ceased production in 2013.
“This is our largest decommissioning project to date, reflecting our continued commitment to delivering bespoke solutions for the timely, safe, and environmentally responsible removal of infrastructure at the end of its operational life cycle,” said Mahesh Swaminathan, McDermott's senior vice president, subsea and floating facilities. “McDermott's growing decommissioning portfolio in Australia also underscores the commitment we share to continue supporting circularity efforts in a lower-carbon economy.”
Project management and engineering will be executed by McDermott's team in Perth, Australia, with support from Batam, Indonesia, and Kuala Lumpur.
The Campbell job was awarded to McDermott in January by Santos and covered a similar scope. The platform was a monopod structure supported by a trio of piled legs that supported minimal topside equipment. It was in the Carnarvon basin 105 km west-northwest of Dampier.
Central to the project’s success was the deployment of a custom-built lifting cradle. Designed and constructed at McDermott’s Batam fabrication yard, with engineering support from teams in Perth, Chennai, India, and Kuala Lumpur, the lifting cradle was specifically engineered to address the unique complexities of the platform’s upper substructure.
