Development
The ETAP complex was sanctioned for development in 1995 with first hydrocarbons produced in 1998. The original development included Marnock, Mungo, Monan and Machar from BP and Heron, Egret, Skua from Shell. In 2002, BP brought Mirren and Madoes on stream. With these nine fields, the total reserves of ETAP are approximately 490 million barrels (78,000,000 m3) of oil, 35 million barrels (5,600,000 m3) of natural gas condensate and 2 billion cubic feet (57,000,000 m3) of natural gas.
A single central processing facility (CPF) sits over the Marnock field and serves as a hub for all production and operations of the asset including all processing and export and a base for expedition to the Mungo NUI. The CPF consists of separate platforms for operations and accommodation linked by two 60 m bridges. The Processing, drilling and Riser platform (PdR), contains the process plant and the export lines, a riser area to receive production fluids from the other ETAP fields and the wellheads of Marnock. The Quarters and Utilities platform (QU) provides accommodation for up to 117 personnel operating this platform or travelling onwards to the Mungo NUI. This partitioning of accommodation and operations into two platforms, adds an extra element of safety, a particular concern for the designers coming only a few years after the Cullen report on the Piper Alpha disaster.
Liquids are exported to Kinneil at Grangemouth through the Forties pipeline system. Gas is exported by the Central Area Transmission System to Teesside.
Apart from Mungo, which has surface wellheads on a NUI, all other fields use subsea tie-backs.
A tenth field, Fidditch, is currently under development by BP. (which has now been put on hold due to the global economic downturn)
Read more about this topic: Marnock
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