Magnus South

Location and Geology

Magnus South is situated in the Northern North Sea, approximately 160 kilometers northeast of the Shetland Islands, within UK block 211/12a. The oil accumulations in this area are primarily found in the intra-Kimmeridge Clay Formation age turbidite sandstones.

Production and Infrastructure

• The Magnus South field is tied back to the main Magnus platform. Production from Magnus South is transported to the main platform through a 5.6-inch internal diameter, 7-kilometer flexible flowline.
• A water injection well provides reservoir pressure support, with injection water supplied from the Magnus platform via the Swift flowline through a 7-inch internal diameter flexible flowline.

Operational History

• The South Magnus field became operational in 1996. It was developed as part of the overall Magnus Exploitation Project, which included the Swift project that involved subsea water injection facilities and tiebacks to the Magnus platform.

Production Details

• The production from Magnus South is processed through the facilities on the Magnus platform. The platform has two parallel two-stage separation trains for oil processing, and gas is cooled, compressed, and exported via the Far North Liquids And Associated Gas System (FLAGS) pipeline to the St Fergus Terminal.

Enhanced Oil Recovery (EOR)

• Although the primary focus of EOR efforts has been on the main Magnus field, the water injection scheme for Magnus South is part of the broader EOR strategy. This involves maintaining reservoir pressure through water injection, which is crucial for optimizing oil recovery rates.

Current Status

• Magnus South ceased production in 2013, and the wells were plugged and abandoned in 2017. This decision was part of the lifecycle management of the field, reflecting the depletion of recoverable reserves in that area.

Technical Specifications

• The Magnus platform, which processes oil from Magnus South, has a design capacity for peak continuous throughput of 85,400 barrels of oil per day (bopd) and a maximum gas export of 110 million standard cubic feet per day (mmscfd). Produced water is treated and discharged to sea, with capacities of 120,000 barrels per day for high-pressure produced water and 30,000 barrels per day for low-pressure produced water.

In summary, the Magnus South project was an important component of the larger Magnus oil field, contributing to the overall production and reserve recovery through its tieback to the main platform and participation in the EOR strategies. However, it has since ceased production and been abandoned.