Approach to Performance, Operability and Risk Assessment of the Shtokman Floating Platform in Ice
- Pavel Liferov (Shtokman Development AG) | Guillaume Le Marechal (Shtokman Development AG) | Marc-Marie Albertini (Shtokman Development AG) | Michel Metge (Shtokman Development AG) | Erik ter Brake (Shtokman Development AG)
- Document ID
- Offshore Technology Conference
- OTC Arctic Technology Conference, 7-9 February, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2011. Offshore Technology Conference
- 4.1.5 Processing Equipment, 4.2.4 Risers, 7.2.1 Risk, Uncertainty and Risk Assessment, 4.5.4 Mooring Systems, 4.2 Pipelines, Flowlines and Risers, 5.1.5 Geologic Modeling, 4.6 Natural Gas, 4.1.2 Separation and Treating, 4.5 Offshore Facilities and Subsea Systems
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The Shtokman Gas Condensate Field (SGCF) is located 610 km from Murmansk in the Barents Sea. The water depth at location is around 340 m. The offshore facilities of the SGCF Phase 1 development will include ice-resistant ship shape disconnectable turret moored floating platform (FP). Significant sea ice invasions occur at Shtokman in approximately 3 out of 10 years, on average. Icebergs may also occur in the SCGF area. Ice and iceberg management are planned to support the FP operations. The present paper describes the methodology to assess performance, operability and risk of the FP in waters where occasional invasion of sea and glacial ice is anticipated.
Challenges with ice-related design and operating philosophy for the Shtokman FP have been described in [Ref. 1]. In brief, the main challenge is to achieve an appropriate reliability level and at the same time minimize operational downtime at acceptable costs. Table 1 summarizes the main ice-related challenges as identified in the pre-FEED and updated during the FEED, categorized by the accidental scenarios.
Actions have been taken in order to address the challenges and quantitatively assess the risks. It shall be emphasised that no attempt was made to target the design of individual components to achieve the target reliability level for the entire system, i.e. floating platform with respect to ice actions. This is simply because it would have been too speculative given all the uncertainties involved. On the contrary, it was decided early to establish challenging but realistic design targets for the main systems (e.g. hull, mooring and disconnection system) and in parallel, work on design of the operational measures, including assessment of their efficiency and reliability. Further, quantitative operability and risk assessments of the entire system have been performed to evaluate potential needs for optimisation.
The objective of this paper is to present the approach developed and used for assessing performance, operability and risk of the Shtokman Floating Platform with regard to sea and glacial ice. The content of this paper is based on numerous studies performed to provide input for the Final Investment Decision.
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