Environmental statement - Flyndre and Cawdor - Maersk Oil

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Flyndre and Cawdor Environmental Statement Section 1 Introduction 1.6.2. INSTALLATION METHOD FOR THE UMBILICAL The final decision on the installation method for the umbilicals has also yet to be determined i.e. will they be trenched and mechanically back filled after or will they be simultaneously layed and trenched. 1.6.3. DISTURBANCE OF CUTTING PILE AT THE CLYDE PLATFORM Maersk Oil is aware of the presence of cuttings piles at the Clyde platform which contain high levels of Total Hydrocarbons Concentrations (THC). The installation of the infrastructure within the 500 m zone has the potential to cause disturbance to these. The majority of the cuttings pile is located below the cutting chute, and disturbance to the pile could be minimised depending upon which area of the platform the riser and umbilical will be situated. The final engineering to determine the hook up locations for the riser and umbilical has yet to be completed, therefore there is uncertainty as to the potential degree of disturbance, if at all, to the cuttings pile. Once the preferred location for the riser and umbilical has been determined a full assessment of the disturbance of cuttings piles will be carried out in the PON15Cs for the Flyndre and Cawdor ES. 1.6.4. QUANTITY OF GAS FLARED AT THE CLYDE PLATFORM Operating philosophies and procedures are currently under development and until this work is fully complete there will be uncertainty over the quantity of gas that needs to be flared at the Clyde platform. 1.7. CONSULTATION PROCESS During the process to assess the environmental impact of the development meetings were held with the Department of Energy and Climate Change (DECC), other statutory conslultees were notified about the project, although no concerns were raised at the initial scoping stage (Table 1‐1). The process of consultation will continue throughout the project. Consultees Issues/Concerns DECC: 16 th September 2010 10 th February 2011 Marine Scotland (consulted as development close to Scottish waters) CEFAS (Max La vedrine) DECC confirmed requirement for ES and requested that high case (P10) production volumes be included. None raised. JNCC None raised. Table 1‐1 Consultation Process. None raised via telephone conversation, although no formal scoping request supplied to CEFAS. D/4114/2011 1 ‐ 7
Flyndre and Cawdor Environmental Statement Section 2 Proposed Development 2. PROPOSED DEVELOPMENT 2.1. INTRODUCTION The Flyndre and Cawdor oil and gas fields are located over 293 km east southeast of Aberdeen, the Flyndre field lies 2 km to the north of the Cawdor field (Figure 2‐1). The reservoirs will be produced through a previously drilled development well at the Flyndre location and a new well to be drilled at the Cawdor location, the hydrocarbons will be transported to the Talisman operated Clyde platform through a new 12” pipeline. Production is expected to commence from the Flyndre field in 2013, with production commencing from the Cawdor field in 2014, the effective field life is 13 and 12 years respectively to the end of 2026. It is expected that 6.4 million tonnes of oil and 2.8 million Mm 3 of gas can be realised as a result of the Flyndre and Cawdor development. Figure 2‐1 Schematic showing location of proposed development and oil and gas export routes. The Clyde platform is located approximately 276 km east southeast of Aberdeen (Block 30/17b). It is a fixed platform on which there are facilities for drilling, production, accommodation and the associated utilities. The topsides operational weight of 20,000 tonnes is supported on a conventional eight‐leg steel jacket and a module support frame. The Clyde platform’s process facilities separate production from the Clyde, Leven, Medwin and Nethan reservoirs (the Clyde Fields) and the Orion subsea tie‐back into oil, and dried natural gas. Oil and gas are exported via the Shell Fulmar ‘A’ Platform to Teeside and St Fergus terminals respectively (Figure 2‐1). Multiple partners are associated with the development as illustrated in (Figure 2‐2). D/4114/2011 2‐1
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Environmental statement - Flyndre and Cawdor - Maersk Oil

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