Feb. 2012 - In 2011, Dong Energy drilled a new injector well on the Nini East field, securing good pressure support and sweep. However, an updated geological model of the field has resulted in a minor reduction of 2P reserves resulting in the amount of 10.7 MMboe gross. The Nini East field has produced to the Siri Center since February 2010.

Jul. 2011 - Norwegian Energy Company has agreed to sell its interests in the Siri field in Denmark to Dong Energy. Noreco’s ownership in Siri’s satellite fields Nini East, Nini, and Ceclilie remain unchanged and unaffected. As part of the agreement, Noreco will not contribute to the costs related to the permanent repair solution for the Siri field. The Siri area is located on the Danish Continental Shelf close to the Norwegian Border, roughly 155 miles (250 kilometers) northwest of Esbjerg on the west coast of Denmark.

Feb. 2010 - Dong Energy commenced oil production from its Nini East satellite field, estimated to hold roughly 17 million barrels of oil reserves. Situated in the Siri complex, approximately 124 miles (200 kilometers) from the Danish west coast, Nini East was developed with a 10-slot unmanned wellhead platform connecting to the Siri platform for further treatment and shipping. Dong Energy operates the field, holding a 40% interest; RWE Dea holds 30%; and Noreco holds the remaining 30% interest.

Jan. 2010 - Dong Energy awarded a contract to Ramboll for the design of a permanent reinforcement solution for the cracks in Siri's subsea structure. The permanent solution consists of installing 1 to 2 piles next to the Siri subsea storage tank and connecting them to the caisson with large clamps. In August 2009, a routine inspection found cracks in a subsea structure that is connected to the oil storage tank underneath the Siri platform. A temporary solution was created, allowing for production to resume, until a permanent solution could be effected. Ramboll will carry out the detailed design for this solution, and the company will act as an engineering subcontractor for Acergy, the EPCI contractor on the project. Permanent repairs are scheduled for completion in the second half of 2010. Siri is located on Block 5604/20 in the northwestern part of the Danish sector of the North Sea. DONG Energy serves as the operator of Siri and holds a 50% interest; Talisman holds 30%; and Altinex holds the remaining 20% interest.

Jan. 2010 - Production has resumed from the Siri field after it was halted in October 2009, following a routine inspection that found cracks in a subsea structure connected to the oil storage tank underneath the Siri platform. A temporary solution, comprised of a metal frame to support the subsea structure, has been enacted to allow production to resume. Permanent repairs are scheduled for completion in the second half of 2010. With the temporary solution in place, production from Siri's adjacent fields, Nini, Cecilie and Stine, will also recommence. The Siri area, located on the Danish Continental Shelf close to the Norwegian border, produces roughly 15 MMbopd and has a life expectancy of 17 years. DONG Energy serves as the operator of Siri and holds a 50% interest; Talisman holds 30%; and Altinex holds the remaining 20% interest.

Jan. 2010 - Dong expects production from the Siri field to resume sometime in January 2010. Production was halted on Aug. 31, 2009, when a routine inspection found cracks in a subsea structure connected to the oil storage tank underneath the Siri platform. A temporary solution was utilized so that production could resume. Specifically, a metal frame was employed to support the subsea structure until a permanent solution was put into place to ensure the stability of its construction. Installation of the temporary solution is progressing, but rough weather conditions in the Danish sector of the North Sea have delayed the installation of the metal frame on the sea bed. The operator plans to complete the installation work and to resume production in early 2010. The Siri field is located roughly 155 miles (250 kilometers) northwest of Esbjerg on the west coast of Denmark. DONG Energy serves as the operator of Siri, holding a 50% interest; Talisman holds 30%; and Altinex holds the remaining 20% interest.

Oct. 2009 - On August 31, 2009, following a routine inspection revealing cracks in a subsea structure connected to the oil storage tank underneath the Siri platform, DONG Energy decided to stop production from the Siri field. The structure carries the load of the caisson containing risers and conductors to and from the subsea storage tank. The cracks developed due to failure of the grouting material designed to fix the caisson. No discharge of oil or other pollution has been detected as a result of the cracks. With the temporary solution production is expected to be resumed during November 2009, depending on the uncertainty regarding weather conditions, the processing time involved in connection with third-party verification of the temporary solution and regulatory approvals, among other factors.

Sep. 2009 - DONG shut in its Danish Siri field and two associated fields, reports Dow Jones. According to the operator, cracks were identified in part of the Siri production platform. During routine maintenance, DONG discovered the cracks in a small tank attached to the Siri platform's 50,000 cubic-meter subsea oil storage tank, the report noted. Dow Jones also reported that no estimate was given for how long the Siri field's production will be halted. Siri pumped 1.91 million barrels of oil equivalent in 2008. DONG operates the Siri field, which is situated on the Danish continental shelf, with a 50% stake.

Oct. 2008 - The planned shutdown on Noreco's Siri field for maintainance for 6 days was executed according to plan. The field is back in production today.

Jul. 2004 - DONG, operator for the oil companies in license 16/98, has completed the well CA-3 (5604/20-10) in the Connie structure at the Cecilie field in the North Sea. The well was drilled with the jackup, ENSCO 70. CA-3 was drilled from the Cecilie platform to the Connie oil deposit located northwest of the Cecilie. Production from Cecilie was started in august 2003. Both oil deposits are located in sandstone of Paleocene age at a depth of two kilometers plus. In April 2004 the Danish Energy Authority approved a plan for development of Connie as part of the Cecilie field.

Feb. 2003 - UWG Group has been awarded a contract by DONG for the design, fabrication, project management and installation of two subsea templates in the Nini and Cecile fields. The identical 10 slot templates, complete with removable docking pile modules, weigh 17 tons each and will be installed from a jackup rig on the two fields which are in the Danish sector of the North Sea.

Jan. 2003 - DONG has completed the appraisal well Cecilie-2 (5604/20-9). The well was drilled with the jack-up rig ENSCO 70 to a total depth of 2347 meters. The well penetrated the paleocene oil-bearing sandstone reservoir 1.2 kilometers southeast of Cecilie-1. Cecilie-2 has now been plugged and abandoned.

Dec. 2002 - DONG Exploration and Production A/S has completed the Nini-4 (5605/10-4) appraisal well in the Danish sector of the North Sea. The well was drilled with the jackup ENSCO 70. The well was spudded November 21, 2002 in approximately 193 feet of water and is located approximately 1 mile southwest of the Nini oil accumulation in a similar geological setting.

Dec. 2002 - DONG has completed the appraisal well Siri-5/5A (5604/20-8) at the Siri Field in the North Sea. The well was drilled with the jack-up rig Mærsk Gallant in the part of the Siri Field referred to as "Stine Segment 2". The well was spudded 21 November 2002 at the location 56°28'36.35" N; 04°59'11.28" E (UTM zone 31; 6,261,053 N; 622,359 E), where the water depth is 59 metres. Siri-5 was drilled in the southern part of Stine Segment 2. The well reached total depth at 2108 metres below sea level in the Våle Formation just above the Chalk. Siri-5 confirmed the expectations of the presence of oil in the Paleocene sandstone reservoir in the southern part of the Stine Segment 2 area. Subsequently a deviated side-track, Siri-5A, was carried out in order to acquire further information about the reservoir and the extent of the oil accumulation. The well has now been plugged and abandoned and the drilling rig has been moved to the Norwegian sector.

Jul. 2002 - The licensees of the Nini and Cecilie oil fields under licences 4/95 and 16/98 have agreed to develop the two fields. Plans for the development have been approved by the Danish Energy Authority and production is expected to start in late summer 2003.

Jun. 2001 - As operator for Licence 6/95 Statoil has now finalised the Siri-4 (5604/20-6) appraisal well in the Danish North Sea. The well was drilled with the jack-up Noble George Sauvageau. Siri-4 was spudded 13 June 2001 at 56°29’20.84" N; 04°59’33.17" E (UTM zone 31; 6,262,438 m N; 622,693 m E) where the water depth is 60 meters. The location lies between the Siri field and the Siri East deposit, where oil is present in sandstones of Paleogene age. Siri-4 was drilled as a near vertical well to a depth of 2091 meters below mean sea level and terminated in the Våle Formation (North Sea Marl) above the Chalk. Oil was encountered in sandstone of Paleogene age. The Statoil Group will now drill a horizontal well from the Siri production platform in order to further appraise the oil accumulation and evaluate if it can be produced directly from the Siri platform. Consequently it was not considered necessary to carry out a production test in Siri-4.

Feb. 2001 - DONG has finalized the exploration well Connie-1 (5604/19-2). The well was drilled with the ENSCO 70 and drilled as a vertical well to a total depth of 2351 meters below mean sea level and terminated in Chalk of presumed Danian age. The well encountered oil in sandstones of Paleogene age. It was not found necessary to carry out a production test, and the well is now being permanently plugged and abandoned.

Dec. 2000 - DONG has reported a successful well with the Cecilie-1 (5604/20-5) which spudded on October 18, 2000. The well was drilled to a total vertical depth of 2319 meters reaching the Danien age chalk level. Sidetracks will be performed to appraise the extent of the discovery.