In the past investigations of the optimum marine pipeline construction technologies in the Arctic Seas have been made and specialized; construction equipment and technique have been developed. This paper presents the results of the investigations of the marine crossing construction for the transmission gas pipeline system which routed across the Baydaratskaya inlet in the Kara Sea. Natural and climatic conditions of this region are presented. Characteristics of the marine pipeline structure are given. The procedures of the pipelaying on the sea bottom from the ice surface are described. Technical data of the lay vessel under the conditions of the Baydaratskaya inlet are set.
The development of the oil and gas fields was spread to the North marine regions, where increased investigation work has resulted. Far going production perspectives are connected With the development of fields in the Barents and Kara Seas. Vast natural gas fields have been discovered in the Yamal peninsula and nearby regions. However, one of the factors delaying the development of hydrocarbon production in the Arctic is a lack of pipelines for transportation to the industrial regions. Technical and economic analysis of the on-shore and off-shore variants of transmission pipelines for gas transportation from the Yamal fields to the USSR central regions are as follows. The marine multiline option including the Baydaratskaya inlet crossing decreases the length of the route by more than 200 km in comparison With the on-shore option and reduces the material and labor necessary for gas pipeline construction. The Baydaratskaya inlet and the Kara Sea are a part of" the described Arctic regions which have become the subject of the investigations. The choice is explained by the possibility, on the one hand, defining the technique of marine pipeline construction under extreme conditions.
