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Nobel Energy – Aseng FPSO – West Africa

Aseng field (previously known as Benita) is an oil and gas field offshore Equatorial Guinea, West Africa. The field lies at a water depth of about 3,100ft (945m).

It was discovered as a gas-condensate resource in Block I offshore Bioko Island in 2007. Two appraisal wells were subsequently drilled to confirm the down dip reservoir limits and resources.

The Vessel was on location for commissioning and he field was brought online in November 2011 about seven months ahead of schedule.

The total cost of the field development was estimated at $1.3bn. Noble Energy is the operator of the Aseng field and holds 40% interest in the project. Other partners include Atlas Petroleum International (29%), Glencore Exploration (25%) and PA Resources (6%).

The Aseng field development plan was approved by the Ministry of Mines, Industry and Energy of the Republic of Equatorial Guinea and Noble Energy partners in July 2009. The design, engineering and awarding of contracts were all completed in 2010. A semisubmersible rig of Atwood Hunter was leased in the same year to start work on the location.

The Aseng development consists of five subsea wells connected to a floating production, storage, and offloading vessel (FPSO).

Oil from the field is stored on the vessel unit while gas and water are reinjected to maintain the pressure. The field has three water injectors and two gas injectors.

Drilling of all the development wells and subsea installations were completed by 2011 and the subsea installations are being carried out. The wells are designed horizontally to enhance recovery and oil productivity.

The field infrastructure will act as a hub to support other future developments. A second field called Alen field is under development in Block O.

Noble Energy has chartered the Aseng FPSO vessel for production from the field. It was reconstructed at the Keppel Shipyard in Singapore.

The upgrades to the vessel included fabrication and integration of internal turrets, installation and integration of the topsides, refurbishment of the accommodation areas and extension of the life of the vessel. The work was completed in October 2011.

The vessel is moored at 3,100ft (945m) in water. It has a total cargo storage capacity of 1.5 million barrels with an oil production capacity of 80,000 barrels of oil per day (bopd) and gas production capacity of 174 million cubic feet of gas per day. Daily water injection capacity is 150,000 barrels.

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