McDermott International recently completed work under its first subsea, engineering, procurement, construction and installation contract with Santos NA  Pty  for the Bayu- Undan Infill Well Phase 3C Project in the Timor Sea located approximately 310 miles off the northwest coast of Darwin, Australia, and 124 miles  off the southeast coast of Timor-Leste.

The Bayu-Undan field is one of Timor-Leste’s largest gas fields. Work on the Phase 3C Project commenced in May and concluded in December 2021. McDermott’s scope involved a tieback of a single in-field well to existing facilities, re-using existing flexible flowline, with a new umbilical and certain infrastructure.

“McDermott completed the scope within nine months of award,” said Mahesh Swaminathan, McDermott’s Senior Vice President, Asia Pacific, Subsea & Deepwater. “McDermott’s industry-leading health, safety and environmental protocols were effective in mitigating certain risks associated with executing a subsea EPCI scope during the COVID-19 pandemic.”

The project is another example of McDermott’s growing success in the subsea and deepwater business. A key to the execution was recovery of existing flexible flowlines, flushing to clear hydrocarbons, re-laying and a tieback from a new in- field well to the existing Bayu-Undan facility.

Recovery and reusing existing flexible flowlines was a significant factor in enabling the work to be completed nine months from award and within the project schedule.

In line with McDermott and Santos’ sustainability goals, local Timor-Leste businesses were engaged to execute components of the project, including concrete mattress manufacture, marine training and experience onboard the primary installation vessel—the Lay Vessel 108.