ABSTRACT

In this age of innovative designs for cost reduction, frame agreements for cost reduction, and standardization for cost reduction, this presentation outlines the alternative approach of applying the CRINE Initiative using a ‘back to basics’ engineering approach to producing subsea trees for marginal field development.

The Industry has long argued that simplicity achieves the highest reliability. To this end the design, function and metallurgy of an example, simple alternative subsea tree design will be described. This design, function and metallurgy of an example, simple alternative subsea tree design will be described. This design is approached by applying the principle of removing the ‘whistles and bells’ from the subsea tree layout and utilizing up-to-date metallurgy, to provide a simple cost-effective tree design which can help reduce the risk on marginal field developments.

The philosophy for selecting the design layouts and a discussion of the selected layouts with their merits and restrictions will also be presented. This will be followed by the material selection philosophy, a discussion of the material selection and the sealing selection.

The objective of this paper is to raise awareness of the fact that alternatives of simpler or even ‘old’ technology, could provide the economic solutions to marginal developments by the upgrading of the basic design and metallurgy.

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