Enochdhu gets green light

September 17, 2013

A plan by ConocoPhillips (UK) and co-venturer Chevron North Sea to develop the central North Sea Enochdhu field has been approved by the UK’s Department of Energy and Climate Change (DECC). 

ConocoPhillips, operator, expects first production to start in late 2014, via the Britannia platform, with an initial gross peak rate of more than 10,000 boe/d.

Enochdhu, in block 21/5a, about 18km south west of Britannia, will be the fourth field to be developed in the Greater Britannia Area, after Britannia, Brodgar and Callanish.

Enochdhu, part of the P.103 Northern Waters 3rd round licence, was awarded to ConocoPhillips and Chevron in 1970. 

The Enochdhu exploration well 21/5a-6, drilled in December 2005 in about 140m water depth (460ft), discovered black oil in Palaeocene reservoir.

Enochdhu will be developed using a two-slot production manifold tied back to the Callanish subsea manifold via a multiphase production pipeline, gas lift pipeline and electro-hydraulic controls umbilical. A tie-in manifold will be located in close proximity to the Callanish manifold. The manifolds, pipelines and umbilical will be incorporated into a subsea bundle.

Callanish ties back to the Britannia platform, at which oil and gas produced from Enochdhu will be processed. Oil will be exported via the Forties Pipeline System to the Kinneil terminal and gas will be exported via the Britannia Gas Export Pipeline to the SAGE Terminal at St. Fergus.

In its environmental statement submission to DECC, in 2012, ConocoPhillips said: “Annual oil and gas production at the Enochdhu development is expected to peak in 2014, with the production of approximately 940,000 cu m oil and 116,000 cu m gas."

The Greater Britannia Area encompasses the Britannia and Brodgar gas condensate fields and the Callanish black oil field. The fields are located in Quadrants 15, 16 and 21, on the UK continental shelf, about 209km (130 mi) north-east of Aberdeen.

The Greater Britannia Area has produced about 600MM boe to date. Work is ongoing on a new mono-column design compression facility for the Britannia platform. When it comes on line in 2014, it will increase Britannia's gas production by approximately 90MM cu f/d. 

A reception process module is also being built for Britannia, to accommodate the Chevron-operated Alder development, another tie-back to Britannia.

Commercial oil production and gas sales started from Britannia in 1998 and from Callanish and Brodgar in 2008. 

After being processed on the Britannia platform, gas is transported via a dedicated pipeline to the Southern Area Gas Evacuation (SAGE) terminal at St Fergus and liquids are transported to the Kinneil Terminal via the Forties Pipeline System.

ConocoPhillips and Chevron each have a 50% interest in Enochdhu.

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