Delineation of the Edvard Grieg field in the North Sea – 16/1-31 S and 16/1-31 A

20/06/2019 Lundin Norway AS, operator of production licence 338, has completed the drilling of exploration wells 16/1-31 S and 16/1-31 A.

The wells were classified as wildcat wells, but are now being reclassified as appraisal wells.

The wells were drilled about 4 kilometres northeast of the Edvard Grieg platform in the central part of the North Sea, 190 kilometres west of Stavanger.

The Edvard Grieg field was proven in reservoir rocks from the Cretaceous, Jurassic and Triassic Ages in 2007, and started production in 2015. Prior to drilling these appraisal wells, the operator had estimated reserves at between 34 and 54 million standard cubic metres (Sm3) of recoverable oil equivalents.

The objective of the wells was to prove oil in conglomerates from the Triassic Age in an extension of the Edvard Grieg basin (16/1-31 S) toward the east and in fractured and porous granitic basement rocks northeast of the field (16/1-31 A).

16/1-31 S encountered an oil column of about 29 metres in conglomerates and conglomeratic sandstone, presumably from the Triassic Age and with generally poor reservoir quality. There is around one metre of sandstone of good quality in the upper part of the reservoir. The oil/water contact was not proven. Pressure measurements show that the reservoir is in communication with the Edvard Grieg field.

Preliminary estimates of the size of the additional resources are between 0.5 and 3.5 million Sm3 recoverable oil and up to 0,35 billion Sm3 gas. The licensees will assess a development to the Edvard Grieg platform.

Several formation tests have been carried out. The production rate from formation test (DST) was 20 Sm3 oil per flow day through a 26/64-inch nozzle opening. The oil is undersaturated with an estimated gas/oil ratio of 125 Sm3/Sm3.

The formation tests show mainly poor flow properties in the conglomeratic part of the reservoir. The injection test yielded stable rates of 2000 Sm3 per day, which is probably due to fracturing and communication with the overlying sandstone. A small-scale formation test in the overlying sandstone reveals good flow properties.

Well 16/1-31 A encountered an oil column of about 62 metres in fractured and weathered basement rock of generally poor reservoir quality. The oil/water contact is estimated at between 1910 and 1912 metres below the sea surface. Small-scale formation tests (mini-DST) show poor to moderate flow properties.

Preliminary estimates of the size of the additional resources are between 0.1 and 2 million Sm3 recoverable oil and up to 0,2 billion Sm3 gas. The licensees will assess a development to the Edvard Grieg platform.

Significant data has been collected and samples have been taken in the two wells. These are exploration wells number 13 and 14 in production licence 338. The licence was awarded in APA 2004.

Wells 16/1-31 S and 16/1-31 A were drilled to respective vertical depths of 2123 and 1977 metres below the sea surface, equivalent to 2195 and 2625 metres measured depth, and were terminated in conglomerate and granitic basement. The wells will be permanently plugged and abandoned. Water depth at the site is 111 metres.

The wells were drilled by the Leiv Eiriksson drilling facility, which will now drill shallow gas pilot wells in production licence 359 in the North Sea, where Lundin Norway AS is the operator.

Map of well 16-1-31-S-and-A

 

Contact
Eldbjørg Vaage Melberg

Tel: +47 51 87 61 00

Updated: 20/06/2019

Latest news

NPD to present new resource report
04/08/2022 On Thursday, 25 August, Kjersti Dahle Grov, Director of Technology, Analysis and Coexistence, will present the Resource Report 2022.
Drilling permit for well 6507/8-11 S
03/08/2022 The Norwegian Petroleum Directorate (NPD) has granted Equinor Energy AS drilling permit for well 6507/8-11 S, cf. Section 13 of the Resource Management Regulations.
Dry well near the Brage field in the North Sea – 31/4-A-13 C
29/07/2022 Wintershall Dea Norge AS, operator of production licence 055, has concluded the drilling of wildcat well 31/4-A-13 C.
High level of activity on the Norwegian shelf in the first half of 2022
20/07/2022 50 years after the Storting (parliament) decided to establish the Norwegian Petroleum Directorate (NPD), there is still plenty of activity on the Norwegian shelf.
Production figures June 2022
20/07/2022 Preliminary production figures for June 2022 show an average daily production of 1 529 000 barrels of oil, NGL and condensate.
Drilling permit for well 31/1-3 S and 31/1-3 A
20/07/2022 The Norwegian Petroleum Directorate (NPD) has granted Equinor Energy AS drilling permit for well 31/1-3 S and 31/1-3 A, cf. Section 13 of the Resource Management Regulations.
Gas discovery near the Skarv field in the Norwegian Sea – 6507/2-6
13/07/2022 Aker BP ASA, operator of production licence 261, has concluded the drilling of wildcat well 6507/2-6.
Dry well near the Fenja field in the Norwegian Sea – 6306/3-2
11/07/2022 ConocoPhillips Skandinavia AS, operator of production licence 935, has concluded the drilling of wildcat well 6306/3-2.
Temporary appointment - Director general
04/07/2022 The Ministry of Petroleum and Energy has announced a temporary appointment, naming Torgeir Stordal (60) as Director General of the NPD from 30 June and until a new Director General of the NPD is hired.
Drilling permit for well 30/5-4 S
04/07/2022 The Norwegian Petroleum Directorate (NPD) has granted OMV (Norge) AS drilling permit for well 30/5-4 S, cf. Section 13 of the Resource Management Regulations.