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Streamer Cable Resilience To Shark Attacks

Arefjord, Gard Valle; Lian, Anders
Master thesis
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URI
http://hdl.handle.net/11250/2615320
Date
2018
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  • Institutt for maskinteknikk og produksjon [4314]
Abstract
In the search for new subsea oil fields, WesternGeco uses vessels to tow streamer cables,

which collects important geological data. Bull sharks are attracted to the magnetic

streamer fields and tend to bite through the streamer cables, causing major losses and

delays. A master thesis by Axel Hagen and Tarald Hagen, studied the response of two

different streamer cables, Nessie 5 and Nessie 6, when subjected to a typical shark attack.

The results displayed that Nessie 5 is more exposed to critical damage from shark attacks.

The mentioned master thesis and their CAD- and FE-models have been studied in detail

to gain knowledge concerning the problem. Some improvements have been made to

the simulation setup. The objective of this project is to propose and evaluate design improvements

to enhance bite resilience on Nessie 5.

The majority of proposed concepts are based on research and own ideas regarding material

changes, dimensional/geometrical changes and adding new components to the cable.

New designs were modeled and tested using the mentioned simulation setup in order to

compare results with the original design.

Several concepts displayed improved resilience against shark attacks, according to the

simulation results. An overall evaluation of given requirements and results from simulations

was done with WesternGeco, and one final design with improved bite resilience is

proposed.
Publisher
NTNU

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