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Helder, Helm and Hoorn are adjacent oil fields located in the Netherlands sector of the North Sea 40 km west of Den Helder and 80 km north west of Amsterdam.
| Helder, Helm and Hoorn oil fields | |
|---|---|
| Country | Netherlands |
| Region | North Sea |
| Location/block | Block Q |
| Offshore/onshore | Offshore |
| Operator | Unocal Netherlands |
| Field history | |
| Discovery | 1979,1980 |
| Start of production | 1982, 1983 |
| Production | |
| Estimated oil in place | 53.9 million barrels (~9.22×106 t) |
| Producing formations | Lower Cretaceous |
The fields
editThe Helder, Helm and Hoorn oil fields are located in Block Q of the Netherlands sector of the North Sea.[1][2] The oil reservoirs are Lower Cretaceous Vieland Sandstone with oils of various properties. The total reserves in the Q Block are estimated to be 53.9 million barrels.[3] The fields were licensed to Unocal Netherlands BV.[1]
| Property | Helder | Helm | Hoorn |
|---|---|---|---|
| Reservoir depth | 1425 m | 1271 m | 1483 m |
| Oil column | 40 m | 87 m | 102 m |
| Discovered | April 1979 | February 1979 | September 1980 |
| API gravity | 21° | 18.3° | 26° |
| Gas Oil ratio | 90 scf/bbl | 150 scf/bbl | 100 scf/bbl |
Development
editThe fields were developed though a number of offshore installations.[1][4][3]
| Platform | Configuration | Water depth | Function | Type | Legs | Well slots | Installed | Production start | Production to |
|---|---|---|---|---|---|---|---|---|---|
| Helder A Wellhead | Bridge linked | 26 m | Wellhead | Steel jacket | 6 | 18 | April 1982 | September 1982 | Helder A Production platform |
| Helder A Production | 26 m | Processing, accommodation | Steel jacket | 4 | – | April and August 1982 | September 1982 | 20-inch 84 km pipeline to Amsterdam | |
| Helder B | Stand alone | Wellhead | Tripod Tower Platform | July 1986 | August 1986 | Helder A Production platform | |||
| Helm A Wellhead | Bridge linked | 26 m | Wellhead | Steel jacket | 4 | 9 | October 1981 | Helm Production platform | |
| Helm A Production | 26 m | Processing, accommodation | Steel jacket | 4 | – | April and August 1982 | September 1982 | Helder–Amsterdam pipeline | |
| Hoorn Wellhead | Bridge linked | 27 m | Wellhead | Steel jacket | 6 | 18 | April 1983 | July 1983 | Hoorn Production Platform |
| Hoorn Production | 27 m | Processing, accommodation | Steel jacket | 4 | – | April and July 1983 | July 1983 | Helder A Production platform 3.4 km 10-inch pipeline |
Early years production (in 1000 stock tank barrels) from the fields were:[1]
| Year | Helder | Helm | Hoorn |
|---|---|---|---|
| 1982 | 571 | 465 | – |
| 1983 | 3071 | 1709 | 2839 |
| 1984 | 4287 | 1222 | 5078 |
From 1984 Helder A received oil production from the Kotter production platform by 27.4 km 12-inch diameter pipeline.[5]
To increase production, in 1991 Unocal drilled 5 horizontal wells and horizontal laterals from 9 of the existing wells in the Helder field. Prior to this programme the field was producing 4200 bbl/d, when complete the production had increased to 10,900 bbl/d.[6][7]
See also
editReferences
edit- ^ a b c d Oilfield Publications Limited (1985). The North Sea Platform Guide. Ledbury UK: Oilfield Publications Limited. pp. 295–314.
- ^ Department of Trade and Industry (1994). The Energy Report. London: HMSO. pp. Map 3. ISBN 0115153802.
- ^ a b Kennedy, J.L. (198). "Third oil field just on stream in Dutch sector of North Sea". Oil and Gas Journal. 82 (1). OSTI 6987451.
- ^ Duncan, D.A. (1987). "The first Tripod Tower Platform: Design, Installation, Operation, and economic viabiilty". onepetro. Retrieved 6 October 2021.
- ^ Goh, L.S. (1996). "The Logger oil Field (Netherlands offshore): Reservoir architecture and heterogeneity". Geology of Gas and Oil under the Netherlands. Springer. pp. 255–263. doi:10.1007/978-94-009-0121-6_21. ISBN 978-94-010-6541-2. Retrieved 7 October 2021.
- ^ Oil & Gas Journal (1991). "Unocal redevelops Helder Field with horizontal wells". ogj. Retrieved 6 October 2021.
- ^ Zagalal, Bashir M. and Patrick J. Murphy (1991). "Reservoir Simulation of Horizontal Wells in the Helder Field". Journal of Petroleum Technology. 43 (8): 906–913. doi:10.2118/19296-PA.