Evaluates a generic horizontal spool tree and wellhead system by
applying a failure mode and effect critical analysis (FMECA). The
credible failure modes were identified assuming normal operating
conditions. Key components and seal arrangements were identified by
following the primary gas paths through the model, which was then
broken up into zones to help to facilitate the FMECA. Primary,
secondary and tertiary barriers between the gas and atmosphere were
identified. The FMECA was performed with the aid of zone specific
drawings. The side pocket mandrels located in the production tubing
have been included for completeness. The FMECA identified failure
modes with the potential to leak injected gas directly to atmosphere.
Further leak sources were identified arising from failure of
component /sealing arrangements causing injection gas to leak into
the B annulus. Each of the failure modes has been reviewed to a level
that permits an appropriate understanding of the failure
mechanisms.
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