ABSTRACT:

Application of subsea technologies near shore or simultaneously with platforms far offshore on the Russian Arctic continental shelf with harsh ice conditions seems to be feasible or at least should be considered within the range of concepts due to possible good economical effect. Installation is one of the crucial marine operations related to the subsea technologies. Right forecast of the weather and wave conditions is the key issue in the planning of installation operation of subsea modules. Limitations of subsea installation related to waves have been shown in this work. Optimal time period for installation, probability of success per one season and mean time of installation have been determined on the basis of statistics accumulated in RMRs' directories.

INTRODUCTION

Subsea technologies on the Russian Arctic continental shelf with harsh ice conditions seem to be applicable or at least have to be considered within the range of concepts. Taking into account the significant progress achieved in offshore development with subsea technologies over last decades and increased reliability one may with high degree of certainty conclude that these systems are important and perspective for Russian shelf. This can also be confirmed by announced plans to use floating structures, which require elements of subsea development. At the same time there is a number of limiting factors enhancing the application of subsea technologies, such as long distances to the shore, ice gouge of seabed at the location of templates or pipelines, limited service and maintenance availability in ice infested waters, limited installation period. Installation is one of the crucial marine operations related to the subsea technologies, which can be executed during ice-free period lasting in some areas about 3-4 month. Therefore right weather forecast, forecast of wave conditions, assessment and determination of available and favorable installation period is a key issue.

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