Geology, geography and global energy

Scientific and Technical Journal

Monitoring base jackup rigs of geophysical methods

2014. №1, pp. 049-060

Sheremetov Ivan M. - C. Sc. in Technology,State construction expert, AU JSC "State Expertise of Projects", 2-4/20/21 Kommunisticheskaya/Sovetskaya/Lenin st., Astrakhan, 414000, Russian Federation ,, shrmtv@mail.ru

Stocks of hydrocarbons on the continental shelf are interesting from the point of view of economy. The requirements for reliability of the equipment for the offshore exploration and production of minerals increased currently, because the risk of damage to structures and equipment determines the level of environmental risk. Jack-up rig (SFDR) is the most popular for exploration and development of offshore fields. Calculation methods are developed for these platforms to ensure their reliability. The forecasting of the interaction of the "jack-up-rigs-ring-base" includes the calculations of stability. Methodological aspects of the problem of forecasting the behavior of the base of supports of jack-up-rigs at complex loading is rather well investigated. But the process of immersion Jack-up-rigs supports in the bottom accompanied by the appearance of areas of plastic deformations, overflowing of ground masses, and formation of the areas of sealing and decompression, which leads significant changes of parameters of the soil. Within this task it is necessary to ensure the accuracy of determining the strength characteristics of the underlying soil sediment at any time. For this purpose it is proposed to carry out geotechnical monitoring of foundation supports of jack-up-rig using geophysical methods. Georadar subsurface sounding is the most practical method for rapid registration of changes in the parameters of soils under the jack-up supports. Geotechnical monitoring of soils which underlying the support will provide timely information to predict the behavior of the "jack-up-basis" under the influence of an external load. This is the key to trouble-free operation of the facility and as a result it provides the ability to prevent damage of the drill string the accident of which leads to the negative environmental impacts.

Key words: shelf,geophysics,monitoring,self-elevating floating drilling rig,stability,

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