Environmental statement - Flyndre and Cawdor - Maersk Oil

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