The Brage field is located in the Norwegian part of the North Sea 120 kilometers west of Bergen in water depths of 130-170 meters.
The field was discovered in 1980 and is operated by Statoil. Production started in 1993 and the maximum production rate of more than 120 000 boed was achieved in 1996. The Brage production facilities consist of an integrated production, drilling and accommodation platform. The crude oil is exported to the Sture terminal via the Oseberg Transportation System. Gas is exported through the Statpipe system to Kårstø. The integrated platform drilling unit allows for drilling of additional development and exploration wells in order to continuously enhance the oil recovery from the field and to tap potential additional resources in adjacent prospects.
The Bowmore well drilled in 2008 produced consistently through 2009. In 2010 this well started to increase water production. Three new wells were completed during the year. Two of these wells were drilled into the Statfjord formation, and were completed in February and May 2010. The latter will be converted to a water injector in 2011. The third well was a producer drilled into the Fensfjord formation and completed in October. The Brage drilling program continues through 2011 and further drilling of new infill wells is being planned for 2012.
The Brage field produced an average of 30 900 boed gross in 2010.
The Enoch field is located in the central part of the Norwegian North Sea and came on stream in May 2007.
The field straddles the Norwegian/UK border and Talisman is operator for the unitised field. Enoch is developed as a single well subsea tie-back to the Brae A platform on the UKCS. Produced oil is transported in the Forties pipeline system to Cruden Bay in Scotland, and gas is delivered and sold at the Brae platform.
The production performance from the Enoch reservoir has been better than anticipated, with very little pressure decline indicating good pressure support. The water cut has started to increase. The production regularity in 2010 has been lower than planned mainly due to technical problems at the host facility including reduced gas lift capacity in periods.
The Enoch field produced an average of 4 100 boed gross in 2010
The South Arne field is located in the Danish part of the North Sea, and is operated by Hess Corporation.
Oil production from the field commenced in July 1999 and gas export commenced later in the year. The platform is an integrated production and accommodation platform, where the oil and gas from the South Arne reservoir are separated, processed and exported. The oil is stored in a subsea storage tank and transferred to shuttle tankers via an offshore loading system for onward transport to refineries in North West Europe. The field is developed with a total of 21 production/injection wells that are producing from a low permeability chalk reservoir.
The overall production level in 2010 was influenced by reduced water injection during the drilling of two new production wells, reduced well maintenance activity due to drilling rig interference, and added production from the two new producers completed during November. The new production wells, SA-20 and -21 which are testing the flank potential and the less prolific Ekofisk formation immediately above the main producing horizon, respectively, have shown encouraging potential. In addition to the contribution from the new production wells, the experience gained has given valuable input to the planning of the next major development on South Arne, the Phase III development project.
The South Arne field produced an average of 21 771 boed gross in 2010.
For the South Arne Phase III development project, the Field Development Plan (FDP) was approved by the Danish authorities in September. The FDP comprises drilling and completion of 11 new producers and injectors as well as installation of two new unmanned wellhead platforms and interfield pipelines controlled from the Central South Arne processing and export platform. Total investments are estimated to be in the range of NOK 6 billion spread over the next few years. The project was sanctioned by the partnership in November and the project is now in the execution phase with major contracts being awarded and with planning, design and procurement initiated. First oil is expected January 2013.
The Lulita oil and gas field is located in the Danish part of the North Sea, and was discovered in 1992.
The reservoir is located in Middle Jurassic sandstone and has been developed with two extended reach wells from the Harald platform. Following processing on Harald, oil/condensate is transported to Gorm via Tyra East. The gas is exported to Tyra East via a separate pipeline. The field is operated by Maersk Oil & Gas AS.
The production from Lulita in 2010 was stable except for planned maintenance and upgrade operations on the host platform Harald due to the tie-in of the new across the border Trym subsea development.
The Lulita field produced an average of 898 boed gross in 2010.
The Siri field is located in the Danish part of the North Sea, and started production in 1999.
The Siri platform is an integrated production and accommodation platform placed on top of an oil storage tank resting on the seabed at a water depth of 65 meters. The oil is produced to the seabed storage tank and via a floating loading buoy transported by shuttle tanker to refineries in North West Europe. The field consists of three reservoirs. The field is operated by Dong Energy.
The Siri platform and facilities is serving the satellites Nini, Nini East and Cecilie. The Siri facilities provide processing, lift gas, injection water, power and oil export facilities for all of these fields.
The Siri field has been produced with simultaneous water and gas injection for pressure support and optimized recovery This has during recent years changed to water alternate gas injection. Produced gas is injected into the reservoirs as no gas export is available. The Siri wells are produced with gas lift to ensure that the wells can be produced efficiently even at high watercuts.
The production at the Siri platform was temporarily shutdown on 31 August 2009 as a routine inspection revealed cracks in a subsea water buffer tank connected to main storage tank. The shutdown included all production from the Siri, Nini and Cecilie fields. A temporary solution to support the Siri platform was installed, and production from the platform commenced on 24 January 2010. A permanent solution is still in the planning phase.
Production from Siri in 2010 was below expectations. One important reason has been the shut-in of the production well SCB-1 since April due to malfunction of a safety valve. The operator has so far not been able to repair the well, and the final solution will most likely involve a full work-over of the well, which may take place later in 2011. Another main reason for Siri producing below expectations was an unforeseen restriction in the Siri platform’s gas handling capacity following the startup of the Nini East field in February. This has been solved in January 2011 through a revamp of the gas compressor, and the gas handling capacity is now considered to be sufficient. The upgrade has increased the gas handling capacity by 40 %. Gas handling capacity was previously the restricting capacity on Siri.
The Siri field produced an average of 4 932 boed gross in 2010.
The Nini oil field is located in the Danish part of the North Sea, 32 km northeast of the Siri field and is operated by Dong Energy.
Nini was discovered in 2000, and production commenced in August 2003. The field is developed with an unmanned platform as a satellite to the Siri platform. Nini consists of three reservoirs. The Nini reservoirs are produced with water injection for pressure support and with gas lift to the producers. A water injection pipeline from Siri provides injection water, and a high pressure gas line is providing lifting gas to the producers.
Production from Nini in 2010 was negatively impacted by the gas handling capacity issues at the Siri platform following first oil from Nini East. The field produced an average of 3 393 boed gross in 2010.
The Nini East field is located in the Danish part of the North Sea, some 7 km east of the producing Nini NA platform. It is operated by Dong Energy.
Nini East is developed with an unmanned wellhead platform which is connected via the Nini NA platform to the Siri platform. The development was approved by the Danish Energy Agency in January 2008. The Nini East platform was installed in July 2009, and the first phase of the production drilling was completed in December 2009. The field started producing 24 February 2010 with two oil production wells and one water injector. Another water injector will be drilled in 2011.
The Nini East field produced an average of 5 992 boed gross in 2010. This was below the reservoir potential, and was caused partly by the previously mentioned gas handling restrictions at the Siri platform, and partly by a somewhat conservative water injection approach.
The Cecilie field is located in the Danish part of the North Sea, and was discovered in 2000. Production commenced in 2003, with Dong Energy as the operator.
The Cecilie field is a satellite to the Siri platform, which provides injection water, lift gas, processing, storage, and export services for Cecilie. The field consists of two reservoirs, Cecilie and Connie.
Like its sister fields, Cecilie also suffered unstable production in 2010 as a result of the gas handling issues at Siri. The Cecilie field produced an average of 563 boed gross in 2010.