Client: Confidential
Location: North Sea

Background:

The objective of the study was to compare the total risk of four different annulus safety systems for the gas lifted wells. The project examined different aspects of risk associated with gas lift gas in the annulus and blowouts.

Solution:

The annulus gas lift risk was. The relative differences between the four annulus safety systems in terms of how they influence the overall risk level of the platform were determined. The total risk for the installations with gas lifted wells was merged with the platform QRA results and measured against the installation risk acceptance criteria as defined in the total risk analysis.

Further, the potential need for well intervention was also investigated for the various well designs.

Result:

Base on the results the operator selected the annulus barriers for the platform wells.