Environmental Statement - Maersk Oil

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2 ‐ 4 Table 2‐1 Balloch reservoir conditions. Reservoir property Value Pressure 3647 psia Temperature 219 o F Gas/oil ratio (GOR) 490 scf/stb Gas gravity ( air = 1.000) 1.070 Balloch Field Development Environmental Statement Stabilised oil gravity at STP 0.8279 (39.41 o API) Saturation pressure 1625 psia Fluid density at saturation pressure 0.697 g/cm 3 Entrained water content of stock tank liquid 0.01 wt% Figure 2‐3 Balloch reservoir as interpreted from seismic data. Section 2 Proposed Development
Balloch Field Development Environmental Statement Section 2 Proposed Development 2.2. DEVELOPMENT OPTIONS Figure 2‐4 Cross section of the Balloch reservoir. The development concept for the Balloch field is a subsea tie back to the GPIII FPSO which currently serves the Donan and Lochranza fields. This is a viable option given the proximity of the Balloch field to the FPSO and the opportunity to combine the tieback with that of the Donan and Lochranza fields. A tieback of the Balloch field to other installations in the area would incur a greater use of resources and increased seabed impacts. Three initial development options, along with the do nothing option, were evaluated (Table 2‐2). Table 2‐2 Development options considered for Balloch. Development Options Summary Do nothing Drilling and subsea infrastructure not required. Subsea Options 1 Short (~80 m) step out from DC2 manifold with cooling spools to meet DC2 design temperature requirements. 2 Long (~1.7 km) step out from DC2 manifold with cooling spools. 3 New Balloch template/flowline tied back to GPIII with new riser. The Options were compared using the following criteria: Value (NPV, CAPEX); Volumetric (Reserves, Shutdown losses); Schedule (First Oil, Impact to FPSO economic limit); Hazard (ALARP & regulatory compliance, Execution risk). Due to the socio‐economic benefits of the Balloch field development, including reducing UK imports of hydrocarbons and providing revenue to the Exchequer, the do nothing option was screened out at an early stage. Unlike option three, options one and two utilise the existing Donan DC2 production manifold and PL2662 13.5 ” production flowline. Brief summaries of the three options are provided below. 2‐5
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B ‐ 2 Halocarbon release during e
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B ‐ 4 Lube and hydraulic oil spil
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Discharges to Sea Discharge from pi
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Production Phase Environmental Aspe
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B ‐ 10 Drainage water Discharge o
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Physical presence Oil and gas infra
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Major accidental events Other envir
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Environmental Statement - Maersk Oil

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