Geology, geography and global energy

Scientific and Technical Journal

Influence exploration work on the properties of sedimentary rocks

2014. №1, pp. 070-077

Serebryakova Valentina I. - Senior Lecturer, Astrakhan Institute of Civil Engineering, 18b Tatishchev st., Astrakhan, 414000, Russian Federation,, Geologi2007@yandex.ru

Exploration and exploitation of gas and gas condensate fields in the south- western part of the Caspian Basin for the first time marked changes in the properties and composition of sedimentary rocks in underground borehole zones around wells and pipelines. Scientific research and experimental fishing operation confirmed that the changes in the properties of rocks and water is due to the influence of cryogenic processes of hydrate formation on the environment. First fall under the influence of hydrate formation processes in rocks and water estuarine areas well, however, in subsequent work processes hydrate wells influence spread from the mouth down to depths of 100-150 m more a result of periodic processes " freeze-thaw " of the breed lose bearing capacity of the column wells and pipelines are bent , which can lead to a crash , the precipice of well casings and pipeline ruptures . Thicknesses and radii freezing rocks around wells and pipelines quickly count the known dependence established by researchers such processes (Makogon etc.) and adapted to the lithological and hydrogeological conditions of the Caspian Basin.

Key words: exploration,exploitation,gas wells,gas,hydrate formation,freezing,

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