ABSTRACT:

The paper examines problematic issues related to the design of oil and gas production platforms for which ice and seismic impacts are deterministic, as well as design criteria, which allow to make a rational decision during design. Analysis of impact of seismic conditions and ice period upon the architecture of the facility and its structural elements is introduced. Designs of offshore ice-resistant platforms for regions with high seismic activity are presented. Special consideration is given to the issues of engineering of platforms designed for operation in severe environmental conditions of Russian shelf.

INTRODUCTION

There is certain expertise in design of fixed ice-resistant platforms in perilous seismic regions of Russian shelf in relatively shallow waters, for example "Vityaz" platform installed on Sakhalin Island shelf at a depth of 32 meters in the area with heavy ice and high seismic activity. Fixed "Pryrazlomnaya" platform for the Pechora Sea will be installed at a depth of 18 meters and will also operate under heavy ice conditions. The paper presents the analysis of several designs of ice-resistant platforms for installation at depths more than 100 meters.

ENVIRONMENTAL DATA OF RUSSIAN OFFSHORE

Development of production platforms for perspective regions of Russian shelf: the Barents Sea, the Kara Sea and Sakhalin Island leads to the necessity to overcome severe combination of environmental conditions, which are associated primarily with the presence of ice period in the regions mentioned. Facilities for the Barents Sea (e.g. Shtokmanovskoye field) should withstand ice drift during winter and rough sea during the rest of the year, whereas facilities for Sakhalin Island shelf (the Sea of Okhotsk) apart from heavy ice during winter and spring and rough sea during other seasons are exposed to seismic loads at a level of 9 points.

This content is only available via PDF.
You can access this article if you purchase or spend a download.