Environmental statement - Flyndre and Cawdor - Maersk Oil

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Flyndre and Cawdor Environmental Statement Section 2 Proposed Development standards are maintained to minimise the amount of hydrocarbons and other contaminants entering the drainage systems. 2.5.10. WELL CLEAN‐UP AND WELL TEST OPERATIONS Prior to production, each well will be cleaned to remove any waste and debris remaining in the well in order to prevent damage to the pipeline or topsides production facilities. A well test will also be conducted to obtain reservoir information and fluid samples. The clean‐up operation will follow UKOOA Best Practice guidelines by isolating the clean‐up train & associated interface liquids for treatment by Rotomill and onshore treatment & disposal, and filtering the following displacement brine prior to any disposal. More detail about the well clean‐ups will be contained within the subsequent Cawdor PON15B’s and OPPC applications. Table 2‐7 presents an estimate of the tonnages of gas and oil that will be flared during the proposed well testing and clean‐up operations of each of the Cawdor wells. The Cawdor development (Phase I and II) is anticipated to have a maximum clean up duration of 84 hours, with 1,805 tonnes of gas and 3,384 tonnes of liquid being flared. Phase I Cawdor Well Well Clean Up Duration (Max hrs) 36 (18 hrs for each flow) Total gas flared (Te) Total liquids flared (Te) 701 1,450 First Phase II Cawdor well 24 552 967 Second Phase II Cawdor well 24 552 967 Total 84 1,805 3,384 Table 2‐7 Well Clean‐up and Test tonnages. 2.6. SUBSEA INFRASTRUCTURE This section details the installation of facilities required to produce and transport the reservoir fluids from the seabed to Talisman’s Clyde platform (Figure 2‐6). These include Xmas tree at each of the Cawdor wells manifold at each of the fields (two in total) the main pipeline from the Flyndre well to the Clyde platform and connecting pipelines from the Cawdor manifold to this pipeline SSIV structure adjacent to the Clyde platform. 2‐ 10 D/4114/2011
Flyndre and Cawdor Environmental Statement Section 2 Proposed Development Figure 2‐6 Flyndre and Cawdor Development. 2.6.1. XMAS TREES The Xmas trees to be used in this development will be of the horizontal type, and will contain the standard instrumentation and sensors. The Xmas trees will house the subsea control modules, chokes, pressure and temperature gauges and a number of chemical injection points. The xmas tree has already been installed in the Flyndre well. The trees used will be fishing friendly and incorporate protection structures to provide the snag load resistance required. Each of the trees and associated protection structures will have a length of 7.11 m and a width of 7.22 m, with a total subsea footprint of 154 m 2 (1) . 2.6.2. MANIFOLDS AND SSIV Subsea manifolds will be put in place at the both Flyndre and Cawdor fields to provide support and protection for all the subsea equipment including controls equipment, manifold piping, flowmeters and valves required to produce the subsea wells. The primary steelwork comprises a structural tubular frame, arranged as a rectangular‐shaped protection structure with vertical sides. The total footprint of each of the manifolds is given in Table 2‐8. 1 This takes into account the three Xmas trees associated with the three Cawdor wells. D/4114/2011 2‐11
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Environmental statement - Flyndre and Cawdor - Maersk Oil

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