In remote offshore locations or in harsh environment, the development costs of gas/condensate fields must be reduced, in order to keep them economically viable.

For these offshore gas/condensate fields, the best economic solution is often a Subsea to Shore scenario, as the cost of a stand-alone development is very high and as the operations in these locations are quite complicated.

The Subsea to Shore scheme for gas/condensate fields can either be a conventional one (as already implemented in North Sea, mainly in Norway), or an innovative one - installing new subsea technologies, using subsea processing and implementing alternative production strategies that reconsider the distribution of facilities between subsea and onshore.

Through an existing gas/condensate field example, operated by TOTAL in the North Sea, in harsh environment and in a remote location, this paper examines the impact on development costs of the following innovations :

  • an innovative hydrate management strategy (continuous injection of LDHI Anti-Agglomerate instead of MEG continuous injection),

  • an innovative production strategy (such as subsea pigging instead of having two production lines allowing the pigging),

  • an innovative subsea technologies (such as all electrical technology for subsea production systems instead of hydraulic systems),

  • and innovative subsea processing (such as subsea chemical storage and injection instead of complicated and costly umbilical).

This paper shows that a combination of alternative production strategies and new subsea technologies can significantly improve the economics of gas/condensate fields, for remote offshore fields or for fields in harsh environment, without jeopardizing HSE performance or production availability.

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