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Johan Sverdrup to get permanent seismic from day one

Written by  OE Staff Wednesday, 17 January 2018 03:11

Norwegian major Statoil has awarded a contract for a permanent reservoir monitoring (PRM) system on the giant Johan Sverdrup field offshore Norway. 

France-based Alcatel Submarine Networks, a Nokia-owned company, will provide 380km of fiber optic seismic cables, with more than 6500 acoustic sensors, which will be installed over 120sq km on the seabed over Johan Sverdrup, making it one of the largest fiber optic seismic systems of its kind, says Statoil. 

In a first for Norway, the technology will be in place from start-up, with installation expected in 2019. Statoil says PRM is a the technology will be a key contributor to delivering a 70% recovery rate ambition on Johan Sverdrup. Average recovery rates offshore Norway are currently 46%.

Johan Sverdrup is 155km west of Stavanger in about 120m water depth. Once complete, Johan Sverdrup Phase 1 will comprise a field center, with four, bridge-linked platforms, with 35 wells, and three subsea satellites for water injection. Phase 1 is on track for first oil in late 2019, with an estimated production capacity of 440,000 boe/d. 

Phase 2 will add another 28 wells, 18 of which are due to be satellite wells, and an additional process facility, to increase production capacity by 220,000 b/d.

“Johan Sverdrup will make up a significant part of Norwegian oil production going forward and has a lifespan of over 50 years, so it is important that we work systematically to maximize value and ensure as high a recovery factor as possible from the field,” says Kjetel Digre, project director for Johan Sverdrup.

Statoil has previous experience with PRM on the Snorre and Grane fields, also on the Norwegian Continental Shelf.

With PRM, seismic sensors are permanently embedded into the seabed which enables more frequent and much improved seismic images of changes in the reservoir. The system on Johan Sverdrup will use optical fiber technology which allows for continuous recording of changes in the subsurface.

Statoil says that the significant data that will be generated by the system is considered a key input to enable it to deliver on its "digital roadmap" for the field.

“This should give us improved precision in our well locations, help us better control production and injection, but should also contribute with information about the condition of wells and subsea infrastructure – which is critical for a field with a 50-year lifespan,” says Eli Eikje, head of Petroleum technology for Johan Sverdrup.

A frame agreement with Alcatel Submarine Networks also includes opportunities for future collaboration around technology development and solutions to further maximize the potential from the PRM system.

The frame agreement also includes an option to extend seismic coverage to include the southernmost part of the Johan Sverdrup field.

Image: The PRM layout on Johan Sverdrup. Image from Statoil. 
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