«Onshore and offshore oil and gas well construction»

Technological variants of developing lithium-bearing deposits of hard-of-recover inter-salt brine-bearing formations by high-pressure fluid system

UDC: 550.822.7
DOI: -

Authors:

¹ Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia
² Irkutsk National Research Technical University, Irkutsk, Russia
³ KrasnoyarskNIPIneft, Krasnoyarsk, Russia
⁴ Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
⁵ Gazprom-Invest, St. Petersburg, Russia

Keywords: inter-salt fractured reservoir, abnormally high formation pressure, development, inter-formational flow, brine

Annotation:

Concentrated metallferous natural brines of the hydromineral province of the Siberian platform, saturating deep-lying inter-salt carbonate productive strata and moving during production from the bottomhole to the wellhead, opening intervals of permafrost or low-temperature rocks in the geological section, are super-cooled and undergo a temperature phase transition. The consequence of this phenomenon is contamination of the well equipment by solid formations, partial or complete blockage of the column space by precipitated salts and a decrease or complete cessation of natural brine output from the well. Salts precipitation of in the column and salt plugs formation do not allow for a high-quality study of the formation, well development and brines further borehole production. The non-equilibrium of extremely saturated brines is the main argument for classifying this type of lithium-bearing hydraulic-mineral raw materials as hard-to-recover reserves (HRR). The authors of the article collected production geological-field data on the deep wells development in the south of the Siberian platform. Statistical studies have been conducted. Wells development data obtained from brine-bearing inter-salt reservoirs with abnormally high formation pressure (AHRP) have been analyzed. The causes of wells development negative results in conditions of exposed brine-bearing AHRP formations have been identified. A number of measures are recommended for ensuring trouble-free wells development in conditions of brine-bearing AHPP formations penetrated by drilling. These measures prevent salt crystallization from extremely saturated natural brines during their extraction from a well.

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