L10 gas field

The L10 gas field is a major natural gas producing field and hub in the Netherlands sector of the North Sea, about 65 km west of Den Helder. The field started producing gas in 1976 and was still operational in 2021.

The field The L10 gas field is located in the Southern North Sea. The field was discovered by Placid International Oil Limited in February 1970. The gas reservoir is an Upper Rotliegendes sandstone at a depth of 3,772 to 3,800 metres. The properties of the gas are: +L10 field typical gas propertiesGas composition and property ValueMethane84.75 %Carbon dioxide2.73 %Nitrogen6.1 %Hydrogen sulfideNilGross calorific value39.19 MJ/m3

Development The L10 gas reservoir was developed by a number of offshore installations across the L10 Block. The L10-A complex is the hub of the field, it receives gas from its bridge-linked riser platform, from L Block satellite platforms, and from the adjacent Block 12. +L10 Field Offshore installationsInstallationCoordinatesWater depth PlatformFunctionTypeLegsWell slotsInstalledProduction startProduction toL10-A Complex53°24’14”N 04°12’07”E28 mL10-A Drilling PlatformDrilling, wellheads, accommodationSteel jacket1012November 19721976Bridge linked to L10-APL10-A Production PlatformProcessingSteel jacket8–19741976Uithuizen by 178 km 36-inch pipelineL10-A Riser PlatformRisersSteel jacket4–Bridge linked to L10-APL10-AC Compression PlatformCompression19871987Bridge linked to L10-APL10 -B Complex53°27’28”N 04°13’59”E27 mL10-B Wellhead PlatformDrilling, wellhead, productionSteel jackets4 61974July 1975L10-A by 7.0 km, 14-inch pipelineL10-BB Wellhead PlatformWellheadSteel platform34July 1980Bridge linked to L10-BL10-C Platform53°23’38”N 04°12’08”E26.5 mL10-C PlatformDrilling, productionSteel jacket461974August 1975L10-A by 1.1 km 10-inch pipelineL10-D Platform53°24’35”N 04°12’54”E27.4 mL10-D PlatformWellheadSteel jacket461977July 1977L10-A by 1.15 km 10-inch pipelineL10-E Complex53°25’57”N 04°14’13”E29 mL10-E PlatformWellheadSteel jacket4619771977L10-A by 4.1 km 10-inch pipelineL10-EE PlatformWellheadSteel platform34September 19841984L10-B to L10-A pipeline by 0.08 km 10-inch pipelineL10-F Platform53°23’13”N 04°15’39”E26 mL10-F PlatformWellheadSteel jacket46July 1980January 1981L10-A by 4.2 km 10-inch spur pipelineL10-G Platform53°29’28”N 04°11’48”E27 mL10-G PlatformWellheadSteel jacket46July 1984August 1984L10-B by 5 km 10-inch pipelineL10-K Platform53°29’38”N 04°16’14”E27 mL10-K PlatformWellheadSteel jacket46September 19841984L10-B by 4.8 km 10-inch pipelineL10-L Platform53.337542N

4.377599E27.1 mL10-L PlatformWellhead19881988L10-AL10-M PlatformL10-M PlatformWellheadSteel platform420002000L10-AL10-S Subsea completionsL10-S1, S2, S3, S4Wellheadsubsea–41988 (S1), 1997 (S2, S3, S4)1988, 1997L10-AP by 6-inch flowlines The L10-A complex also receives gas from K12-C/CC, K12-D, K12-G and K12-K platforms.

Gas from the field is transported through the 178 km, 36-inch diameter Noordgastransport pipeline from the L10-A Complex to Uithuizen. The design capacity of the 36-inch pipeline is 33 million cubic metres per day.

The field was initially operated by Placid International Oil Limited, then Gaz de France Suez, then by Neptune Energy.

Decommissioning In June 2020 Neptune Energy announced that it had decommissioned three platforms in the L10 Field. These were the satellite platforms L10-C, L10-D and L10-G.

In December 2020 Neptune Energy began a feasibility study into whether depleted gas fields near L10-A, L10-B and L10-E could be used to sequester carbon dioxide. The capacity of the reservoirs is around 120-150 million tonnes of CO2 and the annual injection rate would be about 5-8 million tonnes per year.

L10 gas field

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