The article presents the rationale for the need to create submarine oil and gas vessels / structures in the Arctic for the development of oil and gas fields in deep-sea long-freezing seas due to ice impacts that destroy offshore platforms. The need to solve the problems of developing oil and gas resources of the Russian sector of the Arctic seas of the Arctic Ocean (Arctic Ocean) is undeniable. However, the cost-effectiveness of implementing measures requires not only a careful selection of modern technologies and technical means, but also the development of new technical solutions with increasing consideration of the environmental safety problems of the entire oceans. Especially important is the fact that for the development of deeper long-term freezing Arctic seas, it is necessary to create subsea oil and gas production platforms, including, of course, drilling platforms that should be combined with production vessels. It is equally important for the Arctic deep-sea gas and gas condensate fields to use the new technology for liquefying natural gas, specially created for underwater conditions, since modern liquefaction technologies can only be used for surface conditions.
The article presents the current disadvantages of onshore LNG tanks used in the Arctic. A critical analysis of the closest analogue – a floating LNG storage of gravity type - was carried out. On the basis of the results of the critical analysis a completely new design of an underwater LNG storage was offered. Also the principles of submergence and exploitation of the storage were described. The conclusion about the opportunity of application of underwater tank farms was made.
This paper attempts to determine the law of motion of a tank as a large volumetric massive structure when immersed in a resisting liquid medium. The authors propose two methods for its determination. Dependence graphs of coordinates, speed, acceleration of the tank versus time are plotted. The dependence of time and speed of lowering of a massive storage structure on the volume of pumped water is determined. In addition, the range of the optimal volume of water pumped inside the tank for the purpose of its soft landing is determined.
Offshore stationary platforms are actively exploited in the world. The lifespan of some of these platforms exceeds 20 years. Such a significant period of operation leads to the fact that the platforms are exposed to various loads for a long time, causing alternating stresses and, as a result, fatigue damage, including fatigue cracks in welded joints and the base metal of the platform. When fatigue cracks are identified, defect joints are repaired commonly using welding techniques. However, the duration of the subsequent operation of such repaired welded joints is not currently known. The authors conducted an extensive experimental study to understand the life span of welding repair technologies. This approach was for the first time used to repair the welded joint of a platform located in the White Tiger. White Tiger is the Vietnamese offshore oil field, located 200 km east of Ho Chi Minh City on the shelf of the South China Sea. The result of this study was the fatigue diagram and its equation, which were first obtained by the authors.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.