The K7-K12 gas fields are significant natural gas producing areas in the Netherlands sector of the North Sea, about 130 km west of Den Helder. These six contiguous fields started producing gas in 1978 and are mostly still operational in 2021.

K7-K12 gas fields
CountryNetherlands
RegionNorth Sea
Location/blocksK7, K8, K9, K10, K11, K12
Offshore/onshoreOffshore
OperatorNAM, Gaz de France, Pennzoil, Wintershall, Engie E&P Nederland, Neptune Energy
Field history
Discovery1969
Start of production1978
Production
Producing formationsRotliegendes sandstone

The fields

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The K7-K12 gas fields are located in the Southern North Sea. They extend over the Netherlands Blocks K7, K8, K9, K10, K11 and K12. The gas reservoirs have the following properties: [1]

K7-K12 field gas reservoir properties
Block K7 K8 K9 K10 K11 K12
Producing horizon Rotliegendes Rotliegendes Rotliegendes Rotliegendes Rotliegendes
Depth, metres 3,150 3,300 2,770

3,080

3,160
Type of gas High calorific value (CV) High CV High CV High CO2
Recoverable reserves, billion cubic feet 247 720 189 200
Discovery 1969 1970 1973 and

1979

1971 1976
Initial operator Nederlandse Aardolie Maatschappij BV (NAM) Nederlandse Aardolie Maatschappij BV (NAM) Gaz de France Pennzoil NAM Placid
Subsequent operators Neptune Energy, Engie E&P Nederland Wintershall Gaz de France Gaz de France

Development

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The K7-K12 reservoirs were developed by a number of offshore installations across the Blocks.[1] [2] [3] [4] [5] [6] [7]

K7-K12 Field Offshore installations
Field Coordinates Water depth Installation designation Function Type Legs Well slots Installed Production start Production to
K7 53°34’22”N 03°18’18”E 36.1 K7-FA1 Drilling Wellhead Steel jacket 4 9 April 1982 Deck October 1982 Production platform, bridge linked
K7-FA1 Production Processing, accommodation Steel jacket 6 Nil April 1982 Deck K8-FA1
53.55142N 3.26727E K7-FD1 Satellite Steel jacket 4 1998
53.50125N 3.37038E K7-FB1 Satellite Steel jacket 4 2003
K8 53°30’00”N 03°22’13”E 31.2 K8-FA1 Drilling, production, accommodation Steel jacket 10 12 July 1977 Deck March 1978 K14-FA1
K8-FA1-P Accommodation Steel jacket 2001
53°30’55N 03°22’13”E 31 K8-FA2 Drilling, Steel jacket 4 9 October 1977 September 1979 K8-FA1
53°32’32N 03°25’25”E 35 K8-FA3 Satellite Steel jacket 6 9 May 1985 1985 K7
K9 53.52193N 3.99382E 29.6 K9ab-A Satellite Steel jacket 1987
53.55295N 3.78426E 28.4 K9ab-B Satellite Steel jacket 1999
53.65442N 3.87426E 38. K9c-A Satellite Steel jacket 1987
K10 53.363714N 3.253964E 25,

29

K10-BD Wellhead Wellhead Steel jacket 6 12 July 1982 Deck January 1983 Production platform, bridge linked
K10-BP Production Processing, accommodation Steel jacket 6 Nil August 1982 K13-C
53.404257N 3.288094E 29 K10-C Satellite Steel jacket 4 6 July 1982 August 1983 K10-B
K11 53°26’58N 03°20’34”E 29.4 K11-FA1 Wellhead drilling Steel jacket 4 3 1980 Mar 1980 K8-FA1
K12 53°28’36N 03°47’19”E 29.5 K12-A Wellhead Steel Jacket 4 6 July 1983 September 1983 L10-A
53°27’33N 03°54’21”E 27.4 K12-C Satellite wellhead Steel jacket 4 6 September 1984 October 1984
53.34304N 3.89692E 26.5

27.4

K12-BD Satellite wellhead Steel jacket 1983
53.34238N 3.8973 K12-BP Production Steel jacket 1981
53.460784N 3.905925E K12-CC Compression Steel jacket 1994 Bridge link to K12-BP
53.42354N 3.88651E 29.5 K12-D Satellite wellhead Steel jacket 1985
53.35712N 3.98373E 26 K12-G Satellite Steel jacket 2001
53.25221N 3.31354 E 26 K12-K Wellhead platform Steel jacket 2006 2007
53.4218N 3.825E, 53.34694N 4.9475E ?,

26,

46

K12-S1, K12-S2, K12-S3 Subsea wellheads Subsea wellhead 1991, 2002, 2003

The principal pipelines in the fields are:[1]

K7-K12 Fields pipelines
Start End Length, km Diameter, inches Fluid
K7-FA1 K8-FA1 9.4 18 Gas
K8-FA1 K14-FA1 30.9 24 Gas
K8-FA2 K8-FA1 3.8 10 Gas
K8-FA3 K7 9 12 Gas
K10-B K13-C 7.4 20 Gas
K10-C K10-B 5.2 10 Gas
K10-C K10-B 5.2 2 Methanol
K11-FA1 K8-FA1 6 6 Gas
K12A L10A 30 14 Gas
K12A L10A 30 2 Methanol
K12C K12A/L10A line sidetap 0.4 10 Gas
K12C K12A/L10A line sidetap 0.4 2 Methanol
K12B L10A 22 Gas
K12B L10A 22 Methanol
K12C K12C 4.5 10 Gas
K12C Sidetap 4.3 2 Methanol

Production

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Peak production from the fields was as follows:[1]

K7-K12 Fields Production
Field Production million m3/day
K7-FA1 6
K8-FA1 9.2
K8-FA2 6
K8-FA3 3.5
K11-FA1 1.1
K12-A 2.7
K12-C 2.7

Decommissioning

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The K10 and K11 installations are now closed and have been decommissioned.[7]

See also

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References

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  1. ^ a b c d Oilfield Publications Limited (1985). The North Sea Platform Guide. Ledbury: Oilfield Publications Limited. pp. 360–86.
  2. ^ "Natural gas and oil of the Netherlands 2007" (PDF). Retrieved 17 November 2021.
  3. ^ "K07 Gas Fields". Retrieved 17 November 2021.
  4. ^ "K08 and K11 Gas Fields". Retrieved 17 November 2021.
  5. ^ "K12 Gas Fields". Retrieved 17 November 2021.
  6. ^ "Platforms Netherlands Continental Shelf". Retrieved 17 November 2021.
  7. ^ a b "OSPAR Offshore Installations Inventory 2017". Retrieved 17 November 2021.