Environmental statement - Flyndre and Cawdor - Maersk Oil
Environmental statement - Flyndre and Cawdor - Maersk Oil
Environmental statement - Flyndre and Cawdor - Maersk Oil
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5‐ 18<br />
<strong>Flyndre</strong> <strong>and</strong> <strong>Cawdor</strong> <strong>Environmental</strong> Statement<br />
Section 5 Assessment of Potential Impacts <strong>and</strong> Control Measures<br />
dilution, volatisation of low molecular weight hydrocarbons <strong>and</strong> biodegradation of organic<br />
compounds (OSPAR, 2009).<br />
The discharge of PW to sea is one of the largest discharges associated with the development <strong>and</strong> with<br />
offshore oil <strong>and</strong> gas developments as a whole. During the screening phase of the EA, the discharge of<br />
PW <strong>and</strong> associated chemicals was assessed as of moderate risk to the environment.<br />
The production fluids from the <strong>Flyndre</strong> <strong>and</strong> <strong>Cawdor</strong> wells will undergo primary processing on the<br />
Clyde platform. The processing will separate the water from the production fluids prior to export. As<br />
described in Section 2, it is anticipated from the P10 production profiles that water production from<br />
the <strong>Flyndre</strong> <strong>Cawdor</strong> development will peak in 2026 with a rate of 1,110 Te/d (Table 5‐11). The PW<br />
will be treated via the existing PW treatment system on the Clyde platform prior to discharge to sea<br />
(see Section 2.9.3.). A new dedicated produced water treatment system for the <strong>Flyndre</strong> <strong>Cawdor</strong> field<br />
has been proposed although has yet to be designed. During the FEED stage a review of Best Available<br />
Technique <strong>and</strong> Best <strong>Environmental</strong> Practice will be conducted <strong>and</strong> the system designed.<br />
OSPAR (2009) reported that there has been no effect or accumulation of substances from the PW in<br />
wild fish. When PW is discharged there is expected to be an immediate 30‐100 fold dilution, with a<br />
subsequent dilution of at least 1,000 by 500 m from the discharge point. Any impact from the PW<br />
discharges is expected to be localised to near‐field <strong>and</strong> limited to short term impact due to the<br />
dilution experienced <strong>and</strong> the mobility of the water column organisms.<br />
<strong>Maersk</strong> <strong>Oil</strong> are aware of the draft OSPAR recommendation 2011 applicable to PW discharges. This<br />
recommendation advocates the adoption of a risk based approach for oil discharges to the marine<br />
environment (Section 1.4). The <strong>Flyndre</strong> <strong>and</strong> <strong>Cawdor</strong> development is anticipated to only result in a<br />
marginal increase (
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