Breagh Development - RWE.com

Breagh Environmental Statement
Section 2 – Proposed Development
It is anticipated that gas flow for the Phase I development will peak at 1,588 Msm 3 per year
(annual average). The recoverable reserves for the Phase I development are estimated at
15.4 Bscm. It is expected that no sand will be produced with the gas, however it is
anticipated that condensate and water will be produced with the water content peaking in
2013 before falling for the remainder of the field life.
In summary, the development programme considered within this ES comprises:
• Installation of the Breagh A NUI;
• Installation of approximately 100km of 20” pipeline, 3” MEG line and fibre optic (FO)
cable between the Breagh A NUI and Mean Low Water Springs (MLWS) at Teesside;
• Drilling of 7 production wells;
• Commissioning of the wells and facilities;
• Production of gas and condensate.
This ES addresses those activities regulated by the Department for Energy and Climate
Change under The Offshore Petroleum Production and Pipe-lines (Assessment of
Environmental Effects) Regulations 1999 and the Offshore Petroleum Production and Pipelines
(assessment of Environmental Effects (Amendment) Regulations 2007, that is namely
those associated with the offshore aspects of the Breagh development up to MLWS.
2.2. Nature of the Reservoir
The Breagh Gas Field is located in the UKCS Southern North Sea gas basin (Block 42/13)
some 50 km from the North East coast of England. The field was discovered by exploration
well 42/13-2 drilled in 60 m of water by Mobil in 1997. The well tested gas from sandstones
of Visean age (Lower Carboniferous) below the Base Permian Unconformity between 7,300
and 7,650 ft TVD. Table 2-1 shows the Breagh discovery and appraisal well history.
Table 2-1 Well history in the Breagh field
Well Operator Spud Date Well Type Status
42/13-1 BP 29 Jun 1968 Exploration P&A
42/13-2 Mobil 12 Jul 1997 Exploration P&A (discovery well)
42/13-3 Sterling 28 Sep 2007 Appraisal Suspended
42/13-4 Sterling 18 Aug 2008 Exploration/ Appraisal Suspended
42/13-5 Sterling 12 Nov 2008 Appraisal Abandoned
42/13-5z Sterling 24 Dec 2008 Appraisal Suspended
Note: P&A – Plugged and Abandoned
The Breagh gas reservoir, shown in Figure 2-2, is a carboniferous reservoir. The structure is a
four way dip enclosure mapped at Base Zechstein. The gas is reservoired within stacked
fluvial channel sands in two discrete intervals. These sands are interpreted to be the
deposits of large scale braided fluvial channels anastomosing from north to south within a
channel belt many kilometres in width. Recoverable reserves from the Phase I development
are estimated at 15.4 Bscm. Table 2-2 gives the reservoir conditions and fluid properties.
Table 2-3 shows the composition of the Breagh gas.
2-2