ABSTRACT:

The Baydaratskaya Bay Crossing will consist of 1220 mm diameter gas pipelines. These will carry gas from the Yamal fields in northern Russia to European markets. The design of the first phase was carried out by Heerema Oil and Gas Development B.V. of The Netherlands. This paper describes the geotechnical aspects of the design and the engineering solutions applied. Considerable efforts were made in understanding and appreciating the soil conditions along the route. High ice contents, porewater salinity, and warm ground temperatures produced geotechnical conditions that were difficult to engineer, particularly in light of the warm gas temperatures. Geothermal analysis and thaw settlement calculations were performed to predict the performance of the pipeline. The foundations of buildings for pigging equipment were also designed to account for the site specific geothermal conditions.

INTRODUCTION

JSC Gazprom, the Russian Gas company is preparing for the development of the massive gas reserves on the Yamal Peninsula in northwest Siberia. The development of the Bovanenkovskoye gas field requires 1420 mm diameter overland transmission pipelines extending from the Yamal Peninsula to central Russia and beyond to western Europe. The most direct route for the pipeline corridor is to cross Baydaratskaya Bay on an alignment that continues on the west side of the Ural mountains (see Figure 1). The length of the crossing is about 67 km and the 1220 mm diameter pipelines will be buried in the seabed. Gazprom formed a Joint Venture, Petergaz B.V., with Heerema Oil and Gas Development (HOGD) of The Netherlands and HOGD were awarded a contract for detailed design and preparation for construction of the subsea pipelines. The design was to be based on existing data provided by Gazprom. There were, in addition, some geotechnical data gathering programs included in the contract.

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