Kotter and Logger oil and gas fields
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| Kotter oil field | |
|---|---|
  Location of Kotter oil field | |
| Country | Netherlands |
| Region | Southern North Sea |
| Location/block | K18 |
| Offshore/onshore | Offshore |
| Coordinates | 53°04′56″N 03°57′57″E / 53.08222°N 3.96583°E |
| Operator | Conoco, Wintershall |
| Owner | Conoco, Wintershall |
| Field history | |
| Discovery | 1980 (oil), 1992 (gas) |
| Start of production | 1984 |
| Abandonment | 2015 |
| Production | |
| Current production of oil | 25,000 barrels per day (~1.3×106 t/a) |
| Producing formations | Cretaceous/Jurassic sandstone |
The Kotter and Logger oil and gas fields are mid-size fields located in the Netherlands sector of the North Sea, about 40 km west of Den Helder and 107 km north west of Amsterdam. The Kotter and Logger oil fields produced oil from 1984/5 to 2015.
The Kotter oil and gas fields are located in Block K18 of the Netherlands sector of the southern North Sea.[1] The oil reservoir is a Cretaceous/Jurassic sandstone at a depth of 7,500 feet (2,300 metres) and comprises two accumulations in Vieland and Delfland sands. The gas reservoir is an Upper Rotliegendes sandstone at a depth of 4,217 to 4,337 metres, below Zechstein salt.[2][3]
The Logger oil field is in the adjacent Block L16[4] and is also a Cretaceous/Jurassic sandstone lying at a depth of 7,215 feet (2,199 metres), it has a thickness of 10 to 30 metres.[5]
The Kotter oil field was discovered by Conoco in August 1980, the Logger oil field in March 1982, and the Kotter gas field in 1992, both also discovered by Conoco.[1][3]
The properties of the reservoir/ wellhead fluids are:[1][5][2]
| Oil fields | Kotter Gas field | ||||
|---|---|---|---|---|---|
| Oil property | Kotter | Logger | Gas composition and property | Value | |
| API gravity | 32° | 34° | Methane | 86.62% | |
| Gas Oil Ratio | 45 scf/bbl | 48 scf/bbl | Carbon dioxide | 10.79% | |
| Viscosity | 4.93 cP | Nitrogen | 1.02% | ||
| Sulfur | Low | Low | Hydrogen sulfide | Nil | |
| Oil in place | 29 million barrels | Gross calorific value | 35.8 MJ/m3 | ||