Allegheny (GC254) - ENI

Allegheny (GC254) - ENI Oil and Gas Asset Profile

Location

• The Allegheny oil and gas field is located in the Federal offshore waters of the United States, specifically in the Green Canyon Block 254 of the Gulf of Mexico.

Coordinates

• The exact coordinates are 27.6915, -90.2615 (WGS 84).

Operator and Ownership

• The field is operated by ENI Petroleum, a subsidiary of Eni SpA. ENI holds full ownership of the Allegheny and Morpeth deepwater fields following the acquisition of British Borneo in 2000.

Discovery and Production

• The Allegheny field was discovered in 1985.
• Production began in 1999.

Field Characteristics

• The field is situated in deepwater, with a water depth of approximately 3,310 feet.
• It is a conventional oil and gas field, with production supported by the Allegheny Tension Leg Platform (TLP).

Production History and Volumes

• Peak production occurred in 2002.
• As of 2019, the field had cumulative production of 55.2 million barrels of oil and 2,845.82 million cubic meters of gas.
• In 2020, the annual production was 0.65 million barrels of oil and 33.51 million cubic meters of gas. By 2022, this had slightly increased to 0.78 million barrels of oil and 34.27 million cubic meters of gas per year.

Reserves

• As of 2019, the remaining reserves were estimated at 10.1 million barrels of oil and 549.34 million cubic meters of gas.

Infrastructure and Development

• The field is connected to other nearby projects, including the King Kong and Yosemite fields, which are tied back to the Allegheny TLP. The Pegasus field is also tied back to this platform.
• OFD Engineering provided detailed engineering and design for modifications to the Allegheny facility, including the addition of higher pressure subsea wells, gas lift through coiled tubing, and other equipment upgrades such as an HP Separator, Test Separator, and VRU (Vapor Recovery Unit).

Production Forecast

• Based on economic assumptions, production from the Allegheny field is expected to continue until it reaches its economic limit in 2038, having recovered approximately 86.13% of its total recoverable reserves by that time.

Contractors and Partners

• Gulf Island Fabrication was involved in the construction of the Allegheny Sea Star Hull.