Longhorn (MC546) - ENI

Longhorn (MC546) - ENI Oil and Gas Asset Profile

Location

The Longhorn (MC546) oil and gas asset is located in the Federal offshore waters of the United States, specifically in the Mississippi Canyon (MC) Blocks 546 and 502 of the Gulf of Mexico. It is approximately 60 miles offshore the Louisiana coast, around 195 kilometers southeast of New Orleans.

Coordinates

The exact coordinates of the asset are 28.4435, -89.0735 (WGS 84).

Operator and Ownership

The Longhorn (MC546) asset is operated by ENI Petroleum, with ENI holding a 75% working interest. The remaining 25% non-operating working interest is held by Nexen Petroleum Offshore.

Discovery and Development

• The Longhorn Gas Field was discovered in July 2006.
• The project was sanctioned in 2006, and ENI started developing the field in April 2008. The development was completed in October 2009.
• The field was developed in two phases: Phase I included a subsea well tied to the Corral Platform, and Phase II involved adding two more subsea wells tied to the platform, sanctioned in December 2008.

Production

• Production at the Longhorn field began in November 2009, just three years after its discovery.
• The field is expected to produce approximately 200 million cubic feet of gas per day from subsea wells. As of 2020 and 2022, the annual gas production was around 246.89 million m³ and 249.94 million m³, respectively. Oil production is relatively minor, with about 0.11 million barrels per year in both 2020 and 2022.

Reserves

• The remaining reserves as of 2019 include 1951.01 million m³ of gas and 17.4 million barrels of oil.
• Cumulative production as of 2019 was 69.4 million barrels of oil and 11694.75 million m³ of gas.

Infrastructure

• The field is tied to the Corral Platform, which was previously known as the Crystal Platform. This platform is located in MC Block 365, approximately 20 miles northwest of the field, at a water depth of 620 feet. The platform has a processing capacity of 250 million cubic feet of gas per day and 6,000 barrels of oil per day.

Wells and Drilling

• Exploratory drilling began in May 2006 and was completed in August 2006. Appraisal well drilling started in 2006, with three wells drilled. These wells identified around 400 feet of net gas pay in multiple sands.
• The drilling operations were conducted using rigs such as Diamond Offshore’s Ocean America and Transocean’s Amirante. The wells were drilled to a depth of approximately 4,228 meters in 740 meters of water.

Field Development

• The Longhorn Gas Field is part of the Greater Longhorn Area, which includes the Corral Platform. The development involved three subsea wells tied back to the Corral Platform via a 32-kilometer tieback.

Additional Phases

• In 2013, ENI sanctioned Longhorn Phase III, a single well program aimed at increasing the recoverable reserves of the field by tying back to the existing Corral Platform via the existing Longhorn subsea infrastructure.

Summary

The Longhorn (MC546) - ENI Oil and Gas Asset is a significant offshore project in the Gulf of Mexico, operated by ENI with a substantial working interest. The field has been in production since 2009, contributing to ENI's hydrocarbon production in the United States. The project's development and production are managed through the Corral Platform, and it continues to be an important part of ENI's operations in the region.