Enbridge Taps Allseas for 320-Mile Deepwater Oil, Gas Export Pipelines in U.S. Gulf

Allseas will install more than 320 miles of deepwater oil and gas export pipelines for Enbridge in the U.S. Gulf of Mexico, expanding subsea capacity and supporting future production growth.

(PGJ) — Allseas has secured a contract from Enbridge Offshore Facilities, LLC to install four deepwater crude oil and natural gas export pipelines in the U.S. Gulf of Mexico, expanding Enbridge’s subsea transport capacity and bolstering regional energy infrastructure.

The project includes more than 515 kilometers (320 miles) of new pipelines connecting deepwater fields in the Keathley Canyon area to existing offshore hubs for delivery to market. The systems will be installed at water depths up to 2,000 meters (6,561 feet) and feature integrated steel catenary risers, crossings, inline structures, and termination assemblies to accommodate future tie-ins.

According to Allseas, the awarded scope includes:

• 321 kilometers (200 miles) of 24-inch and 26-inch oil pipeline from Keathley Canyon to the Green Canyon 19 platform.
• 195 kilometers (121 miles) of 12-inch gas pipeline connecting Keathley Canyon to Enbridge’s Magnolia Gas Gathering System, which feeds the company’s Garden Banks network.

Each pipeline will include a 3-kilometer (1.9-mile) steel catenary riser linking to floating production units.
The oil export line will tie into the Rome Pipeline on the GC19 platform, scheduled for installation in 2028, while the gas line will connect to the Magnolia Gas Gathering System via the new Sparta Gas Pipeline, a joint venture between Enbridge and Shell Pipeline Company LP, to be installed in 2026.

Allseas will deploy its dynamically positioned pipelay vessel Solitaire for offshore installation between 2027 and 2028. The vessel will use its modified double-joint factory (DJF), an automated system designed for high-efficiency S-lay pipelay operations in deepwater conditions. The DJF integrates automated welding, inspection, and pipe-handling processes to improve precision and maintain high weld-quality standards.

“This award builds on Allseas’ extensive experience in the Gulf—where we have installed more than 8,000 kilometers of subsea pipeline—and demonstrates our capability to execute large-scale, strategic infrastructure that supports our clients’ growth,” the company said.

Allseas said the new systems will expand Enbridge’s deepwater network and enhance long-term export capacity to meet growing oil and gas production in the Gulf of Mexico.