Environmental statement - Flyndre and Cawdor - Maersk Oil

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Flyndre and Cawdor Environmental Statement Section 2 Proposed Development flow meters for measuring gas and liquid hydrocarbon flow respectively will be utilised. A new coriolis flow meter is proposed for the measurement of the PW. A new oil metering station shall be provided on the oil outlet stream from the Clyde 2 nd stage separator and a new connection between the Orion flowline and the existing Clyde test separator shall also be provided. It is anticipated that the oil metering station will consist of 2 × 100% coriolis meters in parallel, complete with sampling facilities. 2.8.3. WATER TREATMENT The majority of PW in the Flyndre and Cawdor reservoir fluids is expected to separate from the oil stream in the Orion production separator. In order to measure the water produced by the Flyndre and Cawdor development the water will be treated in a dedicated treatment package and discharged overboard. Any water carry over will pass to the Clyde third stage separator, which in turn ties into the crude oil dehydrator which has a long residence time and is provided to remove the last few percent of water from the oil stream to achieve the oil export specification of 0.2% basic sediment and water. 2.8.4. FLARE SYSTEM As part of the development of the Flyndre and Cawdor fields there will be limited modifications to the Clyde as existing equipment is to be reused, however pipeline operations will increase flaring from the platform. Should the pipeline shutdown (planned or unplanned) extend beyond a defined ‘no touch time’ the pipeline will cool down to a temperature where hydrates may form. To mitigate this, the pipeline pressure requires to be reduced thus requiring flaring of the pipeline inventory. Restart of the pipeline will require a period of low pressure production to ensure the pipeline temperature rises above the hydrate potential limit prior to pressurisation. During this low pressure phase, gas flaring will be required from separation as operating pressure will be too low to access the HP gas compressor. The potential to minimise flaring by utilising LP compression will be considered as an option during FEED. If restart of the pipeline can be achieved within the ‘no touch time’ limit, gas flow direct to HP compression will be possible and so no additional flaring will be required. If the nature of the shutdown causes the pipeline to pack above normal settle out pressure, then the pipeline pressure will require blowdown to a safe level prior to restart. At the time of writing this ES, the specific operating requirements to accurately determine flaring limits had not been defined. An additional annual flaring load has been calculated on the following basis; 24 hour ‘No Touch Time’ one of the annual Clyde planned shutdowns extending beyond no touch time six of the annual Clyde unplanned shutdowns extending beyond no touch time 50 bar gauge pipeline settle out pressure 120 bar gauge to 80 bar gauge pipeline pressure pack blow down required once per year 24 hour flaring required to warming pipeline at a flowrate of 12 MMscfd On this basis the annual additional flaring load as a result of Flyndre and Cawdor development is estimated at 2,750 tonnes of gas. 17,755 te of gas were flared on the Clyde platform in 2010 (EEMS, 2010). It should be emphasised that the data presented for anticipated additional flaring load is preliminary and subject to change as the design develops. 2‐ 20 D/4114/2011
Flyndre and Cawdor Environmental Statement Section 2 Proposed Development 2.8.5. POWER GENERATION AND FUEL USE As part of the development of the Flyndre and Cawdor field there will be no requirement to install any other combustion equipment as there will be sufficient power generation capacity on the Clyde platform. Therefore no increase in fuel use for power generation is anticipated. 2.9. CHEMICAL USE AND DISCHARGES TO SEA Maersk Oil aims to minimise the effect of the chemicals used/discharged during its operations. As such, and as part of the chemical permitting process, Maersk Oil sets internal targets to reduce the number of chemicals used with a substitution warning and/or product warnings. Wherever possible, chemicals will be chosen which are PLONOR (Poses Little or No Risk to the environment) or are of a Low Hazard Quotient, HQ
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Environmental statement - Flyndre and Cawdor - Maersk Oil

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