Environmental Statement - Maersk Oil

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2 ‐ 20 Balloch Field Development Environmental Statement Section 2 Proposed Development A DSV will be used to lay the jumpers, umbilicals and cooling spools. The mattresses and grout bags will also be put in place using the DSV. No additional vessels will be required as the support and guard vessels associated with the GPIII FPSO will meet the requirements of the DSV. 2.5.11. FLOW ASSURANCE Flow assurance refers to the successful flow of hydrocarbons from the reservoir to the processing facilities. It involves effectively handling many solid deposits such as gas hydrates, scaling, sand, wax, etc. Flow assurance and operability are supported by methanol for the inhibition of hydrates at start up and shut down, by pipe insulation and chemical injection for the management of wax and by chemical injection for the management of other production chemistry issues. The chemical injection requirements for Balloch are the same as for Donan and Lochranza and are expected to include: Hydrate inhibitor Corrosion inhibitor Scale inhibitor Demulsifier Antifoam Deoiler Wax inhibitor Acetic acid Biocide (batch chemical) Anti asphaltene. There will be an incremental increase in chemicals used on the FPSO to process the Balloch hydrocarbons. Details of these will be provided in the subsequent PON15s and changes to the PON15D for the GPIII FPSO. 2.6. FPSO FACILITY The GPIII FPSO is located approximately 2.5 km south west of the proposed Balloch development and currently handles production from the Donan and Lochranza fields. The GPIII has topside areas dedicated for future facilities and therefore little modification is needed to accommodate the proposed Balloch development. Details of the FPSO, including storage capacity, are provided in Table 2‐14. The vessel layout can be seen in Figure 2‐12. Storage Capacity Table 2‐14 Details of the GPIII FPSO. Description Value Length 200 m Beam 38 m Depth 23 m Draft 17 m Accommodation 95 personnel Crude oil 81,064 m 3 Ballast 36,872 m 3 Fuel oil 1,725 m 3 Fresh water 430 m 3 Slops 5,650 m 3
Balloch Field Development Environmental Statement Section 2 Proposed Development Figure 2‐12 FPSO layout. The proposed Balloch development will result in an increase in hydrocarbon production on board the FPSO compared to recent years. However, as Donan and Lochranza are nearing the end of field life the remaining anticipated production from these two fields combined with the anticipated production from the proposed Balloch development is not anticipated to exceed previous maximum production on the GPIII. As Balloch production fluids will be commingled subsea with Donan and Lochranza fluids at the existing DC2 manifold, no new tie‐ins to the FPSO are required. 2.6.1. FPSO PROCESS FACILITIES The GPIII is moored to the seabed by a ten‐point turret mooring system. The FPSO’s turret and its transfer system will link the Balloch subsea facilities to the GPIII. Details of the FPSO swivel stack assembly are given in Table 2‐15. Table 2‐15 GPIII FPSO swivel stack assembly details. Section Description Design Pressure Production Water injection Gas lift / import Hydraulic Utility 1 x 16” swivel/ 4 x 8” production path 1 x 16” swivel/ 4 x 8” production path 1 x 16” swivel/ 4 x 8” production path (spare) 1 x 12” swivel/ 3 x 8” water injection path 1 x 14” swivel/ 3 x 8” aquifer path (spare) 1 x 6” swivel/ 1 x 6” gas lift path 1 x 6” swivel/ 1 x 6” gas import/export path The hydraulic utility swivel has 12 flow paths for hydraulic fluid, methanol, chemicals, instrument air and vent gas 220 230 220 220 for chemicals Fire water 1 x 4” swivel for aerated seawater 17 2.6.2. SEPARATION AND OIL PROCESSING The FPSO’s separation and crude stabilisation system consists of first stage pre‐heaters, two of three phase first stage separators, crude oil heaters, a three phase second stage separator and crude 2‐21
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B ‐ 2 Halocarbon release during e
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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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