Environmental statement - Flyndre and Cawdor - Maersk Oil

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Flyndre and Cawdor Environmental Statement Section 2 Proposed Development Four platforms (Judy, Fulmar, Clyde, Ekofisk) and one FPU (Janice) were initially considered for production of the hydrocarbons from the Flyndre and Cawdor fields. Consideration was also given to tie‐backs to the manifolds at Orion and Affleck and at the Tommeliten development. Initial selection was narrowed down to the Maersk operated Janice FPU and the Talisman operated Clyde platform, these were also the only facilities that responded to Maersk Oil’s request for a suitable host facility. The Clyde platform is situated the closest distance to the Flyndre and Cawdor field and requires little infrastructure modification and has sufficient spare capacity to accommodate the produced fluids and gas. The proposed development of the Flyndre and Cawdor fields over Clyde will maximise production through existing facilities with minimal requirement for new infrastructure. It is therefore considered to offer the best development option in terms of both environmental and economic benefit. In summary the development programme will comprise Phase I the drilling of a well at the Cawdor field the Flyndre appraisal/keeper well (30/14‐3z) drilled in 2007 will act as the Flyndre producer, hence no further drilling is anticipated at the Flyndre field) subsea infrastructure including main pipeline from Flyndre well to Clyde platform; two manifolds, one at each field; SSIV; tie‐ins etc. production of Flyndre and Cawdor well. Phase II (production level dependent) drilling of two additional wells at Cawdor and tie‐backs to the Cawdor manifold production of the two additional wells. From the Clyde platform the oil and gas will be exported to the Teeside and St Fergus terminals respectively. 2.4. SCHEDULE OF ACTIVITIES The proposed schedule of activities is shown in Table 2‐2. Subsea Installation Activities Date Installation of SSIV, production & umbilical risers Q3, 2012 – Q3, 2013 Main pipelines etc. Q2‐Q3, 2013 Flyndre well First Oil Q3, 2013 Cawdor Wells Phase I Cawdor Well Phase II Drilling Q2‐Q3, 2014 First Oil Q4, 2014 Drilling Q1‐Q3, 2017 First Oil Q3‐Q4, 2017 Table 2‐2 Schedule of activities for Flyndre and Cawdor development. 2.5. DRILLING The Flyndre appraisal well, 30/14‐3z, drilled in 2007 was completed, flow tested and is currently suspended. 2‐ 4 D/4114/2011
Flyndre and Cawdor Environmental Statement Section 2 Proposed Development A maximum of three wells are planned in the development of the Cawdor field. First oil from the first well (Phase I) is expected in Q4 2014, while the second and third Cawdor wells (Phase II) are expected to start producing in Q3 ‐ Q4 2017. The coordinates for the Flyndre well and the proposed Cawdor wells are given in Table 2‐3. Flyndre well Latitude 56 o 33’35.236” Longitude 2 o 37’57.773” Cawdor Phase I well Latitude 56 o 32’22.633” Longitude 2 o 34’28.244” Cawdor Phase II wells Latitude Not determined yet, however will be in within 100m radius of the Cawdor Phase I well. Longitude Table 2‐3 Well locations for Flyndre and Cawdor development. 2.5.1. DRILLING SCHEDULE Drilling of the Phase I Cawdor well is expected to commence in Q2 ‐ Q3 2014 and to last for approximately 74 days. Drilling of the Cawdor Phase II wells is expected to commence in Q1 ‐ Q3 2017 and is expected to be of a similar drilling period for each well. 2.5.2. DRILL RIG At the time of writing this ES the drilling contract for the Cawdor wells had not yet been awarded, however, it is planned to use a semi‐submersible rig and it is expected that the wells will be drilled and completed using the Noble Ton van Langveld (NTvL) rig. Therefore for the purpose of assessing the environmental impacts from drilling activities, generic details of a semi‐submersible have been applied and the environmental impacts assessed accordingly in Section 5. 2.5.3. DRILL RIG ANCHOR PATTERN The rig will be towed to location with the assistance of three Anchor Handling Vessels (AHVs), two in front and one to the rear. It will maintain station during drilling activities via the use of anchors. Semi‐submersible drilling rigs tend to have anchor facilities using an eight or twelve point chain wire mooring system. For the purpose of this ES the worst case scenario of 12 will be assumed. While in position a statutory 500 m exclusion zone will be established around the rig, in accordance with safety legislation. Unauthorised vessels including fishing vessels will not be permitted access to the area. The drilling rig will be equipped with navigation lights, radar and radio communications. D/4114/2011 2‐5
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Environmental statement - Flyndre and Cawdor - Maersk Oil

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