Development

Tordis is a field in the Tampen area in the northern part of the North Sea, between the Statfjord and Gullfaks fields. The water depth is 150-220 metres. Tordis was discovered in 1987, and the plan for development and operation (PDO) was approved in 1991. The field has been developed with a central subsea manifold tied-back to the Gullfaks C facility, which also supplies water for injection. Seven single-well satellites and two 4-slots subsea templates are tied-back to the manifold. The production started in 1994. Tordis comprises three structures: Tordis, Borg and Tordis Statfjord. The Tordis structure includes several substructures. The PDO for Tordis Øst was approved in 1995 and for Borg in 1999. An amended PDO for a Tordis IOR subsea separation facility was approved in 2005.

Reservoir

Tordis produces oil from Jurassic sandstone. The reservoirs in Tordis are in the Middle Jurassic Brent Group and the Lower Jurassic Statfjord Group. The structures Tordis Øst and Sørøst also include reworked Brent Group sediments in the Upper Jurassic Draupne Formation. The Borg reservoir is in Upper Jurassic intra-Draupne Formation sandstone, and the reservoir in Tordis Statfjord is in the Lower Jurassic Statfjord Group. The reservoirs are at depths of 2000-2500 metres and the reservoir quality is good to excellent.

Recovery strategy

The field is produced by pressure support from water injection and by natural aquifer drive.

Transport

The well stream from Tordis is transported via two pipelines to the Gullfaks C facility for processing. The oil is exported by tankers, while the gas is exported via Gassled A to the Kårstø terminal.

Status

The production from Tordis is maintained through pressure support and well interventions. The production has increased in 2023 due to better production from new wells and increased production efficiency. 4D seismic acquired in 2021 is being used for reservoir management and to identify further infill drilling targets. Drilling of a new production well is being planned.