ABSTRACT:

In Russia prospects of oil and gas extraction are related to the development of numerous fields on the shelf of the Arctic and Far-East Seas which have dramatically large hydrocarbon reserves. The construction of offshore oil and gas projects in severe Arctic conditions depends on a large shortage of fuel and power resources. According to the present forecasts the construction of marine pipelines on the Barents, Kara and Okhotsk Seas shelf will amount to more than 2.500 km in the nearest future. The development of these regions is linked with the requirements of new technical decisions: great depth, ice conditions, permafrost soils in shallow water, shore deformation, effects of ice bergs and stamukhs, seismic activity and a number of other parameters. Marine underwater oil and gas pipelines are subjected to stringent requirements in terms of safety since a pipeline accident would cause inadmissible contamination of sea waters and costly sea restorating operations. The paper gives the data regarding offshore pipeline system construction on the Russia continental shelf that will be put into operation in the forthcoming years. Technical decisions on design and construction technology of Arctic marine pipelines are considered.

MARINE OIL AND GAS CONSTRUCTION PROJECTS

Natural gas reserves of the Kara sea shelf are estimated as much as 14.0 trillion m3 (gas fields: Rusanovskoe, Leningradskoe, Zapadno-Sharapovskoe, Kruzenshternovskoe, etc.). The water area depth does not exceed 150 m, remoteness is up to 120–150 km. In the region (the Vamal Peninsula) a few large natural gas fields are discovered and prepared for development (Bovanenkovskoe, Kharasoveiskoe, etc.). The explored and blocked-out reserves of these fields are estimated up to 9.0 trillion m3. The project envisages laying through the Baydaratskaya Bay of 8 gas lines 1220 mm dia with internal pressure of 7.4 MPa.

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