What we do

Challenge

The project entailed the removal and transport of the vent tower (top elevation + 81.5m LAT) and a crane boom from the Thames Complex, located in Block 49/28 of the Southern North Sea, 80 km north east of the Bacton Terminal to an onshore disposal yard, located in Vlissingen (NL).

Thames installation was a three bridge-linked platforms’ complex: the wellhead (AW) platform, the processing and quarters (AP) platform and the reception platform (AR).

The Thames Complex is approximately 19.5 m from LAT to the cellar deck and 43 m from LAT to the Helideck. The jacket was in a 32.5 m water depth. Production ceased in 2014.

Neptune (Offshore Installation Vessel) at Vent project, UK (side)

Solution

DEME’s scope comprised the following activities:

Preparations & engineering
Mobilisation of ‘Neptune’ in Great Yarmouth
Transit to Thames field
Removal of the vent tower (120 tonnes, 62 m height) and down-ending on 'Neptune’s' deck
Removal of AW crane boom
Transport to onshore disposal yard in Vlissingen
Offloading the removed assets at the disposal yard in floating mode
Demobilisation of ‘Neptune’ in Vlissingen

Used technology

Offshore installation vessels

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